Newport Media, Inc. Patent applications |
Patent application number | Title | Published |
20140055117 | Digitally Controlled Spur Management Technique for Integrated DC-DC Converters - An integrated circuit for digital controlling switching noise spurs in a receiver by shifting a switching frequency (f | 02-27-2014 |
20130324186 | Single Transceiver for Wireless Peer-To-Peer Connections - Data transfer in a communications network includes a first communication device including a transceiver; and an interface operatively connected to the first communication device, wherein the interface provides multiple operative connections for data transfer, wherein the multiple operative connections include a WLAN connection adapted for communication with an access point that generates data exchange signals; and a P2P connection adapted for communication with a second communication device, wherein the transceiver is shared between the multiple operative connections. The first and second communication devices may include a WiFi device. The first communication device may further include a pair of data registers and state machines; a MAC layer controller that receives input from the pair of data registers and state machines; and a PHY layer controller that receives input from the pair of data registers and state machines and the MAC layer controller, and sends instructions to the transceiver. | 12-05-2013 |
20130322499 | Single Transceiver Operation - A system and method includes a pair of voltage-controlled oscillators (VCOs) that include a first VCO generating a first signal associated with data transmission of a first type of wireless data signal; and a second VCO generating a second signal associated with data transmission of a second type of wireless data signal, wherein the first type of wireless data signal uses a different carrier frequency than the second type of wireless data signal. The system further includes a multiplexer operatively connected to the pair of VCOs that selectively outputs the first signal or the second signal to generate a selectively outputted signal; and a mixer operatively connected to the switch that combines the selectively outputted signal with at least one additional signal and outputs a composite signal. The first type of wireless data signal includes a WiFi signal. The second type of wireless data signal includes a Bluetooth® signal. | 12-05-2013 |
20130322467 | Wireless Memory Management - Memory management for WiFi Media Access Control (MAC) frames includes dividing a memory into equally-sized smaller chunks; writing a MAC frame that is larger in size than one-chunk size into several chunks; appending special information to each chunk to specify whether the chunk is a starting chunk or an intermediate chunk of the MAC frame or whether the chuck is currently unoccupied at all; linking the chunks carrying the MAC frame; and specifying a task waiting to be performed for the MAC frame. The several chunks may be noncontiguous or contiguous. The memory management technique may further comprise searching the memory for chunks comprising frames waiting for a certain task. The memory management technique may further comprise marking the chunks as empty after the certain task is completed. | 12-05-2013 |
20130322417 | System and Method for Hardware Sharing - A method of transceiving data includes providing a wireless transceiver chip that supports multiple wireless standards for transceiving data packets, wherein a first wireless standard comprises a first modulation and demodulation scheme, and wherein a second wireless standard comprises a second modulation and demodulation scheme, and wherein the first modulation and demodulation scheme is incompatible with the second modulation and demodulation scheme; activating only one PHY layer of the wireless transceiver chip during the transceiving of the data packets; using a MAC layer of the wireless transceiver chip to specify whether the first or second wireless standard is to be used for a given transceiving of the data packets; and the PHY layer receiving instructions from the MAC layer regarding which wireless standard is to be used for the transceiving of the data packets using hardware that is shared by the PHY layer corresponding to both wireless standards. | 12-05-2013 |
20130322412 | Unbiased Media Contention in the Presence of Conflicting Wireless Operation - Unbiased media contention in the presence of conflicting wireless operation of data transmission includes beginning media contention only during Bluetooth® operation; treating the Bluetooth® operation as a rejection of media transmission; holding a backoff timer associated with a backoff period steady for a specified duration; upon immediate completion of the Bluetooth® operation, WiFi contends with a small backoff value when media access is busy; using a small random number for the backoff period during a non-Bluetooth® data transfer period; and keeping an overall backoff timer unbiased for a duration of the data transmission. The specified duration may include an end of the Bluetooth® operation or a maximum backoff time that is reached. The random number for the backoff period includes uniform distribution in a contention window. A mean backoff timer value equals a uniform mean value minus a ratio of a Bluetooth® operation period to a total backoff period. | 12-05-2013 |
20130322334 | HARQ Buffer Size Reduction in Wireless Systems for Downlink Shared Channels - A receiver arranged to process a flow of data in a communication system for downlink shared channels and a method for processing the flow of data sequence. The receiver includes a processor that receives a subframe comprising a data packet; a demapper that receives supplemental channel data symbols and is positioned after the processor in a sequence of the flow of data; means for performing rate matching of estimated the data symbols and positioned after the demapper in the data sequence; and a Hybrid Automatic Retransmission Request (HARQ) buffer positioned before the demapper in the data sequence. The communication system includes a long-term evolution (LTE) communication system. | 12-05-2013 |
20130322315 | Coexistence of Interfering Wireless Signals - A system and method of permitting coexistence of WiFi and Bluetooth® data transfer on a single chip in UE including a transceiver includes using CTS data packets to protect Bluetooth® signals for SCO communication links; using only WiFi circuitry in the chip to determine when Bluetooth® data transfer is required by the UE; establishing a specified period of the Bluetooth® data transfer; and starting WiFi medium contention only upon an end of the specified period of the Bluetooth® data transfer on the single chip. The power save mode of the WiFi circuitry may be used with Bluetooth® ACL data packets in WiFi periodic data transfer gaps. The WiFi data transfer has no timing constraints, whereas the Bluetooth® data transfer has timing constraints and can only occur during the specified period. The WiFi data transfer does not occur when the Bluetooth® data transfer is occurring. | 12-05-2013 |
20130271662 | Multi-Chip Antenna Diversity Picture-in-Picture Architecture - A multi-chip antenna diversity architecture and method includes a first receiver chip that receives a first input signal from a first antenna. The first receiver chip includes a first tuner that amplifies the first input signal, a crystal operatively connected to a first crystal oscillator circuit, and a first crystal oscillator clock buffer that receives a clock signal from the first crystal oscillator circuit. A first demodulator demodulates the input signal received from the first tuner. A second receiver chip receives a second input signal from a second antenna. The second receiver chip includes a second crystal oscillator circuit, a second crystal oscillator clock buffer, a second tuner, and a second demodulator that receives diversity data from the first demodulator. The first crystal oscillator clock buffer drives the clock signal to the second crystal oscillator clock buffer, the second tuner, and the second demodulator of the second receiver chip. | 10-17-2013 |
20130251072 | Low Power, Multi-Chip Diversity Architecture - A multi-chip antenna diversity architecture includes a first receiver chip including a first tuner, and a first demodulator directly connected to the tuner. The first demodulator demodulates the first input signal received from the first tuner. A first power sequencer that controls the first receiver chip, and a first chip ID including a voltage source V | 09-26-2013 |
20130215540 | High Voltage Electrostatic Discharge Clamp Using Deep Submicron CMOS Technology - An ESD circuit includes a plurality of MOS devices arranged in a stack, wherein each of the MOS devices comprises a source, a drain, and a gate; a voltage source inputting a supply voltage to the stack of MOS devices; a first plurality of resistors dividing the supply voltage to each source and each drain of the MOS devices in the stack; a second plurality of resistors biasing the supply voltage to each gate of the MOS devices in the stack; an inverter device operatively connected to the second plurality of resistors; a time lag circuit that turns the inverter device on and off; and a plurality of capacitors pulling the voltage to each gate of the MOS devices in the stack to the supply voltage upon the inverter device turning off. | 08-22-2013 |
20130099871 | Multi-Phase Voltage Controlled Oscillator Using Capacitance Degenerated Single Ended Transconductance Stage and Inductance/Capacitance Load - An electrical circuit includes a first transistor having a first source, a first drain, and a first gate, whereby the first transistor receives an input voltage through the first gate. An output voltage terminal outputs voltage from the first transistor and is connected to the first drain. A second transistor includes a second source, a second drain, and a second gate, whereby the second transistor receives a bias voltage through the second gate, and wherein the first source is connected to the second drain. A first capacitor is connected to the first source, the second source, and the second drain. An inductor is connected to the first drain. A second capacitor is connected in parallel with the inductor and further connected to the first drain. | 04-25-2013 |
20130003899 | Area and Power Efficient Architectures of Time Deinterleaver for Receivers - A method and apparatus for de-interleaving interleaved data in a deinterleaver memory in an Orthogonal Frequency Division Multiplexing (OFDM) based Integrated Services Digital Broadcasting Terrestrial (ISDB-T) receiver. In different embodiments, the apparatus comprises of a OFDM symbol counter along with a divider or a buffer pointer RAM with circular pointer logic, a first lookup table to obtain delay buffer size and interleaving lengths for a given OFDM transmission layer, and a second lookup table to obtain buffer base address and interleaving lengths for a given OFDM transmission layer. | 01-03-2013 |
20120270603 | DEVICE, SYSTEM, AND METHOD FOR PROVIDING WIRELESS DATA ACCESS, DIGITAL TV ACCESS, RADIO, AND STORAGE CAPABILITY - A portable memory device dimensioned and configured as any of a removable flash memory card, a USB flash drive, and a jump drive and a method of wireless communication, wherein the portable memory device comprises a single housing component; a data storage component within the single housing component; and a wireless receiver operatively connected to the data storage component and within the single housing component, wherein the wireless receiver is adapted to receive wireless signals comprising radio signals, satellite signals, TV signals, and Bluetooth™ specification signals, and wherein the wireless receiver is adapted to wirelessly communicate with a LAN. The portable memory device may further comprise an interface component adapted to connect to a host computing device. Preferably, the TV signals comprise mobile TV signals. | 10-25-2012 |
20120213273 | PHYSICAL LAYER AWARE VIDEO ENCODING FOR MOBILE TV APPLICATIONS - A system and method of transmitting video in a time division multiplexing (TDM) system, wherein the method comprises identifying a video reference frame from a series of video frames; encoding a difference between the video reference frame and a video non-reference frame; placing the video reference frame at a beginning of a data burst; transmitting the series of video frames and the data burst from a transmitter to a mobile TV receiver; and the mobile TV receiver immediately locating the video reference frame upon receipt of the data burst. The method may further comprise the mobile TV receiver decoding the series of video frames. Additionally, the placing process results in a substantially non-existent channel switching delay in the mobile TV receiver. Moreover, the method may further comprise placing exactly one video reference frame at the beginning of the data burst. Preferably, the TDM system comprises a mobile TV system. | 08-23-2012 |
20120081608 | Multi-Chip Antenna Diversity Picture-in-Picture Architecture - A multi-chip antenna diversity architecture and method includes a first receiver chip that receives a first input signal from a first antenna. The first receiver chip includes a first tuner that amplifies the first input signal, a crystal operatively connected to a first crystal oscillator circuit, and a first crystal oscillator clock buffer that receives a clock signal from the first crystal oscillator circuit. A first demodulator demodulates the input signal received from the first tuner. A second receiver chip receives a second input signal from a second antenna. The second receiver chip includes a second crystal oscillator circuit, a second crystal oscillator clock buffer, a second tuner, and a second demodulator that receives diversity data from the first demodulator. The first crystal oscillator clock buffer drives the clock signal to the second crystal oscillator clock buffer, the second tuner, and the second demodulator of the second receiver chip. | 04-05-2012 |
20120063553 | Low Power, Multi-Chip Diversity Architecture - A multi-chip antenna diversity architecture includes a first receiver chip including a first tuner, and a first demodulator directly connected to the tuner. The first demodulator demodulates the first input signal received from the first tuner. A first power sequencer that controls the first receiver chip, and a first chip ID including a voltage source V | 03-15-2012 |
20120063380 | Interleaver Address Generation in Turbo Decoders for Mobile Multimedia Multicast Communication Systems - Address generation for interleaving in a wireless communication system includes at least one input generation module to generate at least one input signal. A first address generator module and a second address generator module generate a first output address for interleaving and a second output address for interleaving. A selector module selects an address for interleaving from the first and the second output address based on predetermined criteria. At least one input translation module is receives an input signal and translate the received input signal to generate a nominal input signal based on a value of the received input signal. An address generation module generates an address for interleaving based on the nominal input signal. | 03-15-2012 |
20110255800 | Fixed Buffer Real-Time Image Compression Technique - Performing real-time compression on an image for target buffer fullness includes dividing the image into N macro-blocks, performing a discrete cosine transformation (DCT) on each of the N macro-blocks, defining a Quantization Parameter Scalar (Q) for each of the N macro-blocks of the image on the DCT being performed, initializing the Quantization Parameter Scalar (Q) for the first Macro-block to a value that correlates to a buffer fullness of a previously compressed image, and monitoring the buffer fullness by comparing the buffer fullness with the target buffer fullness. The N macro-blocks include 16×16 macro-blocks. The Q value is increased to a first new value when the buffer fullness is greater than the target buffer fullness. The Q value is decreased to a second new value when the buffer fullness is less than the target buffer fullness. | 10-20-2011 |
20110255011 | All Digital Front-End Architecture for Television with Sigma-Delta ADC Input - A digital front-end architecture for television receivers with sigma-delta ADC input. An input digital signal is fed to the architecture and the gain is controlled by a gain stage. In the first method, the gain stage is controlled by a first AGC. Here, the gain is increased if the first threshold value is larger than the magnitude of a complex phase-locked loop (CPLL) output, and the gain is decreased if the first threshold value is lower than the magnitude of the CPLL output. In the second method, the gain is controlled through a second AGC. The gain is controlled by increasing the gain if the second threshold value is larger than a line peak of the moving average filter output, and the gain is decreased if the second threshold value is lower than the peak. The second threshold value and the peak are compared in a peak search block. | 10-20-2011 |
20110254166 | Chip Area Optimized Pads - An optimized semiconductor chip pad configuration. The pad includes a pad circuit area Ap, a first dimension x and a second dimension y, in a chip having N number of pins on each side. The pins include a longitudinal axis, and the chip includes a chip core of length Lc. The method includes determining the first dimension x by dividing the length Lc by the N, determining the second dimension y by dividing the pad circuit area Ap by a result of a division of the length Lc by the N, and creating a semiconductor area pad that includes pins with the longitudinal axis positioned parallel to the chip core. A stack of circuits is designed in the chip to fit in the pad based on the first dimension x and the second dimension y. | 10-20-2011 |
20110250859 | Pilot Based Adaptation for FM Radio Receiver - Performing a decoding mode of a frequency modulation (FM) signal for an adaptive FM radio receiver includes passing the FM signal through a FM demodulator to obtain a composite signal that includes a pilot signal and noise around the pilot signal, passing the composite signal through a band bass filter, filtering the pilot signal from the noise using a pilot and noise separator that includes a notch filter that filters the pilot signal from the noise, obtaining average amplitudes of the pilot signal and the noise, comparing a ratio between the average amplitudes of the pilot signal and the noise with a programmable threshold, and selecting a decoding mode and an audio low pass filter. The decoding mode is selected based on a quality of the pilot signal being decoded and the audio LPF is selected based on the comparison ratio. | 10-13-2011 |
20110249908 | Optimized Prediction Based Image Compression - A technique for optimizing a prediction method of samples in blocks of an image is provided. The image includes a first block, a second block, a third block, and a fourth block, each of the blocks include 8×8 blocks and form one Macro block. The method includes performing a prediction of the second block, the third block and the fourth block by performing at least one of prediction methods. A prediction error per block (P | 10-13-2011 |
20110249723 | Frame Buffer Compression and Memory Allocation in a Video Decoder - Frame buffer video compression on an input video stream to efficiently allocate and utilize memory used for storing reference frames in a video decoder includes parsing a video header to obtain a maximum number of reference frames (N), dividing an available frame buffer memory to hold [N+1] compressed frames, controlling a compression process to limit a size of each frame such that said size is not less than a frame buffer memory size divided by [N+1], parsing messages that contain reference frames by looking ahead in an input video stream buffer of the input video stream, and allocating memory for compressing a given reference frame based on a number of needed frames at a frame buffer. A quantization of the compression process may be adjusted to improve a picture quality of the input video stream. | 10-13-2011 |
20110249720 | Buffer Size Reduction for Wireless Analog TV Receivers - Reducing a frame size in a memory for a receiver includes compressing a first analog television picture frame, storing the compressed frame in the memory, decompressing the compressed frame from the memory, obtaining a second analog television picture frame. The first frame includes a first set of pixels that further include at least one of Red/Green/Blue (RGB) samples and, the second frame includes a second set of pixels. Each of the first set of pixels of first frame being decompressed are compared with the corresponding second set of pixels of second frame to obtain an alpha (α) factor. A Signal to Noise Ratio (SNR) and a motion per pixel of the first set of pixels and the second set of pixels are compared. Each of a pixel is displayed based on the α factor. | 10-13-2011 |
20110249185 | Apparatus and Method for Equalizing Analog TV Signals - An apparatus and method for equalizing analog TV signals includes an antenna that receives the signal data, wherein the signal data comprises a luminance carrier comprising a luminance channel and a chrominance carrier comprising a chrominance channel; an analog-to-digital converter coupled to receiving antenna that converts the received signal data to digital signal data; an instruction memory storing digital equalizer instructions; and a digital equalizer system, coupled to the memory and the analog-to-digital converter, wherein the digital equalizer system processes the digital equalizer instructions to estimate a noise variation of the luminance channel; equalize the luminance channel; and equalize the chrominance channel, wherein the equalization of the chrominance channel is separate and distinct from the equalization of the luminance channel. | 10-13-2011 |
20110249184 | Apparatus and Method for Adaptive Filtering - An apparatus and a method for adaptive filtering includes an antenna that receives analog video broadcast signal data; an analog-to-digital converter coupled to the antenna and converting the received analog video broadcast signal data to digital video signal data; a frame buffer memory storing the digital video signal data; an instruction memory storing adaptive filtering instructions; and an adaptive filter coupled to the memory and the analog-to-digital converter, wherein the adaptive filter: reads the adaptive filter instructions from the memory; executes the adaptive filter instructions; averages an input pixel with a corresponding pixel stored in the frame buffer memory; calculates a forgetting factor for each pixel in the plurality of pixel values stored in the frame buffer memory; and filters noise from each pixel of the plurality of pixel values stored in the frame buffer memory based on the forgetting factor. | 10-13-2011 |
20110249182 | SECAM Line Identification and PAL Switch - SECAM line identification in an analog television includes an accumulator that accumulates a FM demodulated output corresponding to a color reference tone for each SECAM line; a first leakage average filter receiving a first result from the accumulator; a second leakage average filter receiving a second result from the accumulator; and a line decision block comparing the first result and the second result. An apparatus for soft-decision based PAL switch detection in an analog television includes a burst locked oscillator (BLO) receiving a composite video signal as input and producing an instantaneous PAL switch signal for each line; a leakage average filter receiving the PAL switch signal and filtering noise from an output received from the BLO; and a switch detection block receiving a filtered output from the leakage average filter, and making a decision based on a sign of the filtered output of the leakage average filter. | 10-13-2011 |
20110249180 | Dual Burst Locked Oscillator Architecture for an Analog Television Receiver - Color information decoding on a composite video signal that includes modulated color information for an analog television receiver. A first burst locked oscillator (BLO) operates in a first loop gain, and a second BLO operates in second loop gain and is operatively connected to the first BLO. The first loop gain is higher than the second loop gain. A method includes receiving, in a first burst accumulator, mixed down color information directly from a first phase detector without filtering the mixed down color information, converting the composite video signal to a burst gate signal, accumulating one or more of the burst gate signal, and calculating a frequency offset for the second BLO in the first BLO expedite the calculating of the frequency offset and to compensate for the second BLO operating in the second gain loop. | 10-13-2011 |
20110234895 | System and Method for Video Downscaling - A system and method for downscaling signal data, where the system includes an antenna receiving video signal data; an analog-to-digital converter coupled to the antenna and converting the received analog signal data to digital signal data; a memory storing video downscaling instructions; and a video downscaling processor, coupled to the memory and the analog-to-digital converter, wherein the video downscaling processor, upon reading the video downscaling instructions from the memory and executing the downscaling instructions: divides the digital video signal data into a plurality of blocks, wherein each block comprises a plurality of pixel elements; and cycles through the plurality of blocks, and for every block in the plurality of blocks, generates a new block, wherein the new block comprises a plurality of new pixels evenly spaced within the new block. | 09-29-2011 |
20110110447 | Scattered Pilot Correlation in DVB-H Systems - A method for correlating scattered pilot locations in a sequence of OFDM symbols in a multi-carrier transmission system, and includes mapping pilot locations comprising pilot symbols having predetermined known values, wherein the pilot symbols are positioned among data subcarriers in time and frequency dimensions consisting of received pilot symbols and having a predetermined position pattern in the time and frequency dimensions, wherein the predetermined position pattern comprises a finite number of sub-position patterns each corresponding to positions of the pilot symbols; estimating a Doppler spread in a frequency spectrum between the transmitter and the receiver in the multi-carrier transmission system; estimating a channel length of a set of channel paths received at the receiver; and the receiver automatically selecting one of a plurality of predetermined methods of correlating the scattered pilot locations in the sequence of OFDM symbols based only on the estimating processes. | 05-12-2011 |
20110110446 | SCATTERED PILOT CORRELATION IN DVB-H SYSTEMS - A method for correlating scattered pilot locations in a sequence of OFDM symbols in a multi-carrier transmission system, and includes mapping pilot locations comprising pilot symbols having predetermined known values, wherein the pilot symbols are positioned among data subcarriers in time and frequency dimensions consisting of received pilot symbols and having a predetermined position pattern in the time and frequency dimensions, wherein the predetermined position pattern comprises a finite number of sub-position patterns each corresponding to positions of the pilot symbols; estimating a Doppler spread in a frequency spectrum between the transmitter and the receiver in the multi-carrier transmission system; estimating a channel length of a set of channel paths received at the receiver; and the receiver automatically selecting one of a plurality of predetermined methods of correlating the scattered pilot locations in the sequence of OFDM symbols based only on the estimating processes. | 05-12-2011 |
20110088063 | System and Method for Television Programming Data Management - A system, method, and service of managing data comprises establishing a computerized user profile guideline corresponding to selected television programming interests of a user; instructing a processor to manage data based on the computerized user profile guideline, wherein the data is received from a television programming broadcaster; and managing access to specified television programming when the computerized user profile guideline corresponding to the selected television programming interests of the user is satisfied. The process of managing access may comprise alerting the user with information pertaining to the specified television programming. | 04-14-2011 |
20110003573 | System and Method for Performing RF Filtering - A method of filtering and a RF filtering circuit comprising a LO adapted to generate in-phase and quadrature LO signals; a quadrature passive mixer operatively connected to the LO; a filtering impedance operatively connected to the quadrature passive mixer, wherein the voltage at an input node of the quadrature passive mixer comprises the voltage across the filtering impedance up-converted to a frequency of a LO signal received by the quadrature passive mixer. Preferably, the voltage across the filtering impedance comprises a frequency of an input signal of the quadrature passive mixer down-converted by a frequency of the in-phase and quadrature LO signals and filtered by the filtering impedance. | 01-06-2011 |
20100220242 | Area and Power Efficient Architectures of Time Deinterleaver for ISDB-T Receivers - A method and apparatus for de-interleaving interleaved data in a deinterleaver memory in an Orthogonal Frequency Division Multiplexing (OFDM) based Integrated Services Digital Broadcasting Terrestrial (ISDB-T) receiver. In different embodiments, the apparatus comprises of a OFDM symbol counter along with a divider or a buffer pointer RAM with circular pointer logic, a first lookup table to obtain delay buffer size and interleaving lengths for a given OFDM transmission layer, and a second lookup table to obtain buffer base address and interleaving lengths for a given OFDM transmission layer. | 09-02-2010 |
20100020736 | INTERLEAVER ADDRESS GENERATION IN TURBO DECODERS FOR MEDIAFLO COMMUNICATION SYSTEMS - Address generation for interleaving in a wireless communication system includes at least one input generation module to generate at least one input signal. A first address generator module and a second address generator module generate a first output address for interleaving and a second output address for interleaving. A selector module selects an address for interleaving from the first and the second output address based on predetermined criteria. At least one input translation module is receives an input signal and translate the received input signal to generate a nominal input signal based on a value of the received input signal. An address generation module generates an address for interleaving based on the nominal input signal. | 01-28-2010 |
20090323871 | Application of Superfast Algorithms to a Pilot-Based Channel Estimation Process - An apparatus and method of applying a superfast algorithm to a pilot-based channel estimation process includes receiving a signal comprising information bits transmitted in a wireless channel, executing the pilot-based channel estimation process having p structures for a vector of pilot structures and an upper bound N for a channel spread, determining a result of a matrix inversion of a channel correlation matrix for an error channel estimation offline without performing a matrix inversion, storing pilot information of the received signal for channel recovery in a transform domain, representing the Toeplitz inverse by a FFT representation, detecting and estimating nonzero taps of a channel impulse response of the wireless channel, obtaining a non-structured minimum mean-square-error (MMSE) estimate as a first estimate of locations of the nonzero taps, and replacing the non-structured MMSE estimate by an estimate computed by a tap detection algorithm. | 12-31-2009 |
20090323790 | Doppler Frequency Estimation and Adaptation for MediaFLO Systems - A technique for Doppler frequency estimation and adaptation in a MediaFLO™ (Forward Link Only) receiver system includes receiving Orthogonal Frequency Division Multiplexing (OFDM) symbols in the receiver, dividing a Doppler frequency range into N ranges corresponding to N interpolation filters; determining a correlation between two OFDM symbols separated by time; estimating a Doppler frequency by the correlation of OFDM symbols; determining a ratio of the correlation of OFDM symbols; comparing the determined ratio of the correlation of OFDM symbols with a look up table of α stored at a receiver to determine a corresponding Doppler frequency; mapping α ranges stored at the look up table to suitable interpolation filters; estimating an interpolation filter from the mapped α ranges mapped against determined α ratio; adapting Time Domain Interpolation (TDI) to the selected interpolation filter; and synchronizing receiver to the TDI filter. | 12-31-2009 |
20090323789 | Doppler Frequency Estimation in Wireless Communication Systems - An apparatus and method for estimating Doppler frequency in a wireless communication network, wherein the method comprises determining a first correlation coefficient (c | 12-31-2009 |
20090311985 | SUBSAMPLING WIDEBAND RSSI CIRCUIT - A Received Signal Strength Indicator (RSSI) circuit includes a subsampling circuit that processes an input signal comprising a sampling frequency, fs, wherein the subsampling circuit subsamples the input signal, wherein the input signal is subsampled to concentrate a power in a narrow bandwidth; an analog-to-digital converter (ADC) operatively connected to the subsampling circuit, wherein the ADC digitizes the subsampled signal; and a baseband detector operatively connected to the ADC, wherein the baseband detector detects a power from the digitized subsampled signal and creates an output signal. The subsampling circuit and the ADC may operate as a single subsampling ADC. The RSSI circuit may further comprise ignoring higher order aliases at a multiple of the sampling frequency if the baseband detector is clocked at the sampling frequency. | 12-17-2009 |
20090302944 | NOISE-SHAPED BLOCKER-REJECT AMPLIFIER - A fully differential amplifier that amplifies and filters a signal band of a communications channel, the signal band including a desired signal and at least one blocker signal of an adjacent communications channel, the fully differential amplifier includes a fully differential operational amplifier (op-amp) with a common mode feedback, the fully differential operational amplifier amplifying the desired signal, a variable input resistance connected to an input of the fully differential op-amp, and an asymmetric floating frequency dependent negative resistance (AFFDNR) filter connected to the fully differential op-amp between the input and an output of the fully differential op-amp. A plurality of inputs of the fully differential op-amp may be virtually grounded to reduce swings in a voltage. The AFFDNR filter filters the at least one blocker signal and includes a plurality of resistors that implement a high order filtering of the at least one blocker signal. | 12-10-2009 |
20090300470 | MEMORY ARCHITECTURE FOR HIGH THROUGHPUT RS DECODING FOR MEDIAFLO RECEIVERS - A system and method for increasing the throughput of a RS decoder in MediaFLO™ receivers. A MAC de-interleaver RAM architecture allowing operation of parallel RS decoders comprises of four equal portioned memory banks, a codeword buffer for data correction, and a higher bit width RAM. The method of increasing throughput of RS decoder by minimizing RAM access and clock frequency includes increasing the bit width of the de-interleaver RAM, using parallel RS decoder cores for decoding received data, partitioning a 4-bank RAM and ECB allocation scheme, and correcting the data using intermediate buffers. The architecture enables on-chip implementation of the MAC de-interleaver RAM and RS decoders with reduced power consumption and provide higher RS decoder throughput. | 12-03-2009 |
20090300300 | MEMORY SHARING OF TIME AND FREQUENCY DE-INTERLEAVER FOR ISDB-T RECEIVERS - Time and frequency de-interleaving of interleaved data in an Integrated Services Digital Broadcasting Terrestrial (ISDB-T) receiver includes exactly one random access memory (RAM) buffer in the ISDB-T receiver that performs both time and frequency de-interleaving of the interleaved data and a buffer address calculation module for generating buffer address in the buffer. The system performs memory sharing of the time and frequency de-interleaver for ISDB-T receivers and reduces the memory size required for performing de-interleaving in an ISDB-T receiver and combines the frequency and time de-interleaver buffers into one RAM thereby reducing the memory size. | 12-03-2009 |
20090296843 | SEGMENTED-FRAME SYNCHRONIZATION FOR ISDB-T AND ISDB-TSB RECEIVER - A technique for segmented frame synchronization for Integrated Services Digital Broadcasting-Terrestrial (ISDB-T) and Integrated Services Digital Broadcasting-Terrestrial Sound Broadcasting (ISDB-TSB) systems, wherein the method comprises receiving a wireless digital signal comprising an Orthogonal Frequency Division Multiplexing (OFDM) frame, further comprising ODFM symbols, in a receiver and wherein the receiver comprises a time de-interleaver, a bit de-interleaver, and a descrambler; filling memory of time de-interleaver and bit de-interleaver by the received wireless digital signal; determining an OFDM segmented frame boundary when memory of the time de-interleaver and bit de-interleaver are full; decoding bits from time de-interleaver and bit de-interleaver using a Viterbi decoder; outputting the Viterbi decoding bits from time de-interleaver and bit de-interleaver when the OFDM segmented frame boundary is detected; obtaining a segmented multiplexing frame boundary upon receipt of the first bit from the Viterbi decoder; and synchronizing the OFDM frame based on the segmented multiplexing frame boundary. | 12-03-2009 |
20090290663 | COARSE FREQUENCY OFFSET ESTIMATION FOR DIGITAL MULTIMEDIA BROADCASTING - A method of estimating a coarse frequency offset of Digital Multimedia Broadcasting (DMB) transmission frames includes receiving the DMB transmission frames including a synchronization channel having a phase reference symbol, circularly shifting the phase reference symbol by applying a circular shift to the phase reference symbol, numerically correlating the circularly shifted phase reference symbol with a known correct phase reference symbol to obtain a highest peak and a side peaks of the numeric correlation, and computing a phase reference symbol angle based on a multiplication of the peak and a carrier spacing of the DMB transmission frames. The peak is determined when the circularly shifted phase reference symbol is equal to the known correct phase reference symbol. The peak and side peaks corresponding to the peak are operated in a range of a maximum value of the circular shift. | 11-26-2009 |
20090290496 | ROBUST DEFRAMING OF MAC LAYER PACKET FOR MEDIAFLO SYSTEMS - A technique for finding errors in the fragment headers of the fragments of service layer packets without depending on the erasure indicators of Medium Access Channel (MAC) layer packets of a wireless signal in a wireless communication system, wherein method comprises determining if length of the fragment header is between 121 and 127; determining if length of the fragment header is equal to 127, and if the fragment header is not the last fragment header in a service layer packet being formed; determining if summation of length of the fragment header for a value N is greater than 122 subtracted by number of fragments collected from a MAC layer packet including fragment header; and determining if fragment header is not the last fragment header in the service layer packet being formed, and if fragment header length is less than residual number of bytes in the MAC layer packet. | 11-26-2009 |
20090285314 | ADAPTIVE FREQUENCY DOMAIN EQUALIZATION IN OFDM BASED COMMUNICATION SYSTEM - An apparatus, system, and method of performing adaptive frequency domain equalization in an Orthogonal Frequency Domain Multiplexing (OFDM) based communication system transmitting data information, wherein the method comprises receiving OFDM symbols comprising scattered pilots; obtaining channel estimates on every third bin of the scattered pilots in a frequency domain, wherein the channel estimates are obtained by performing an interpolation in a time domain across the received OFDM symbols; estimating an original channel based on the channel estimates, wherein the original channel in the time domain is estimated by applying a finite impulse response (FIR) low-pass filter in a frequency domain, wherein the FIR low-pass filter is adaptive according to a delay span of an original channel impulse response and is sufficiently wide to cover the delay span of the original channel impulse response; and dividing the received OFDM symbols by the channel estimate to obtain transmitted data information. | 11-19-2009 |
20090285096 | HARDWARE ACCELERATED PROTOCOL STACK FOR MEDIAFLO - Protocol stack layer processing for a MediaFLO™ mobile multimedia multicast system comprising a transmitter comprising a host processor and a host memory component. The processing includes a receiver that receives a wireless data stream comprising a MediaFLO™ mobile multimedia multicast system superframe comprising any of audio, video, and text media frames arranged in multiplexed Multicast Logical Channels (MLCs) and received from the transmitter, wherein each MLC is divided into 16 byte data packets, and wherein each MLC carries up to three logical sub-channels comprising stream | 11-19-2009 |
20090273374 | HIGH LINEARITY VOLTAGE TO CURRENT CONVERSION - A system and method for performing voltage to current conversion, the system comprising of a first set of devices that senses the input voltage signal through its input terminal and replicates said input voltage across a second set of devices which then converts said replicated input voltage signal to an output current signal; a third set of devices that transfers the output current signal to output terminals; a differential feedback loop comprising an amplifier positioned between a first one of the first set of devices and a first one of the third set of devices; and a common mode feedback loop that regulates the output average voltage to a reference voltage. | 11-05-2009 |
20090271684 | Iterative decoding between turbo and RS decoders for improving bit error rate and packet error rate - A technique for iterative decoding between turbo and Reed Solomon (RS) decoders for improving bit error rate (BER) and packet error rate (PER) in a receiver in a wireless communication system comprises receiving data samples comprising turbo encoded packets and RS code words at the receiver; decoding turbo encoded packets of the received data samples using a turbo decoder; decoding RS code words of the received data samples using a RS decoder; feeding the RS decoded data to turbo decoder to perform a plurality of iterations; and correcting data errors present in the received data samples. | 10-29-2009 |
20090268850 | Coarse Frequency Offset Estimation in ISDB Receivers - A method of estimating a coarse frequency offset in a receiver includes providing at least one candidate frequency offset in Orthogonal Frequency-Division Multiplexing (OFDM) symbols having transmission and multiplexing configuration control (TMCC) bins and auxiliary channel (AC) bins, modulating the TMCC bins and AC bins using differential binary phase shift keying (DBPSK) modulation, estimating a phase difference between a first symbol and a second symbol for the candidate frequency offset of the TMCC and AC bins to obtain a resulting phase difference, correcting the resulting phase difference based on a difference between the candidate frequency offset and a Fast Fourier Transform (FFT) center bin to obtain a corrected phase difference, mapping the corrected phase difference to numeric numbers, and adding the numeric numbers for the candidate frequency offset to obtain a summation result. The numeric numbers correspond to at least one of +1 or −1. | 10-29-2009 |
20090268826 | Time Domain Based Approach for Fast Fading Channel FFT Trigger Point Tracking in ISDB Receivers - A method of fast fading channel Fast Fourier Transform (FFT) trigger point tracking in an integrated services digital broadcasting (ISDB) receiver includes inputting a signal in a fading channel including N Orthogonal Frequency Division Multiplexing (OFDM) symbols, determining an average correlation result of a current time-domain sample of the signal and a previous time-domain sample taken previously of the signal, accumulating the average correlation result for at least one of the OFDM symbols, determining a peak of the average correlation result to obtain a peak position, and identifying the peak position as a trigger point of the input signal. The peak position may be compared with a first trigger point to generate a trigger point error signal. The first trigger point may be set at the middle of a guard of an OFDM symbol to generate the trigger point error signal. | 10-29-2009 |
20090268803 | Channel Estimation for High Doppler Mobile Environments - An apparatus and method of applying a fast algorithm to a pilot-based channel estimation process includes receiving, in a receiver, a signal comprising information bits transmitted in a wireless channel, executing a pilot-based channel estimation process running on a decision-directed turbo estimation procedure having a p structure for a vector of pilots and an upper bound N for a channel spread based on a feedback of detected information bits via OFDM, encoding the detected information bits, re-encoding the detected information bits at a decoder output, re-constructing and subtracting an ICI term from the received signal, modulating the detected information bits, estimating channel symbols in a per-carrier basis based on a diagonal matrix of a full matrix involved in the pilot-based channel estimation, and performing training of the wireless channel based on an entire vector of the channel symbols. | 10-29-2009 |
20090268735 | Look-Up Table Based Approach for Layer Combining in ISDB-T and ISDB-TSB Receivers - A method of layer combining based on generating a look-up table in an Integrated Services Digital Broadcasting (ISDB) receiver includes obtaining a transmission parameter configuration, generating the look-up table based on the transmission parameter configuration, assembling a null transport stream packets and a valid transport stream packets from a plurality of layers of a multiplexing frame, and generating a completed transport packet stream using the look-up table. The receiver may generate the look-up table by at least one of generating the look-up table in real time or selecting from a look-up table set based on the transmission parameter configuration. The transmission parameter configuration may include at least one of a transmission mode, a guard interval, a modulation, and a coding rate. The look-up table may define an order of the null transport stream packets and the valid transport stream packets from the plurality of layers in the multiplexing frame. | 10-29-2009 |
20090268665 | Method and Apparatus for Locating MediaFLO Capable Wireless Devices - Estimating a current location of a receiver in a MediaFLO™ (Forward Link Only) mobile multimedia multicast system comprises receiving digital signals comprising a MediaFLO™ superframe comprising orthogonal frequency division multiplexing (OFDM) symbols; performing slot | 10-29-2009 |
20090268656 | Fast Common Overhead Services Acquisition for MediaFlo - A technique for fast common overhead services acquisition for MediaFLO™ mobile multimedia multicast system, wherein encoding overhead information symbol (OIS) information in a first burst of MLC of each superframe, OIS comprises control channel (CC) information and reserved flow data comprising primary flow data, service information data, notification flow data, configuration flow data, and presentation metadata; encoding padding in second MLC burst; encoding parity bytes in third and fourth MLC bursts; encoding primary flow data in final MLC burst per superframe; encoding the remaining reserved flow data at the end of superframe; transmitting wireless data stream comprising first MLC at ½ forward error correction (FEC) rate and receiving it in receiver; determining a correctness of CC information by checking cyclic redundancy check (CRC) bits at the end of each received data packet; and transmitter sending size wise remainder of reserved flows at the end of superframe. | 10-29-2009 |
20090262842 | Robust FFT Trigger Point Tracking for Echo Channels in OFDM Based Communication Systems - Identifying a trigger point of at least one OFDM decoder includes correlating a first time-domain sample of the at least one OFDM symbol with a second time-domain sample of the at least one OFDM symbol, processing the first time-domain sample and the second time-domain sample in the first moving average filter to determine a channel impulse response, comparing at least one correlation value of a first biggest path in the channel impulse response and a second biggest path in the channel impulse response, and determining a channel length of the channel impulse response based on a time duration of the channel impulse response. The OFDM decoder includes a first moving average filter and a second moving average filter. | 10-22-2009 |
20090257607 | IMPLEMENTATION OF DIVERSITY ANTENNAS IN SMALL PORTABLE MEDIA DEVICES AND CELL PHONES - A mobile telecommunications apparatus includes a portable media device adapted to receive electronic data through a network, the portable media device comprising a first antenna adapted to receive electromagnetic signals of a particular frequency, the frequency is at least one of a radio frequency and a television (TV) frequency, and a headset in electrical communication with the portable media device and adapted to receive the electronic data through the network, the headset includes a switch coupled to the first antenna, a second antenna coupled to the switch, and a headset speaker comprising at least one of a mono headset speaker and a stereo headset speaker, the switch is adapted to combine operation of the first antenna and the second antenna into a dual operation diversity receiver. The network may comprise a Digital Video Broadcasting over Handheld (DVB-H) network. | 10-15-2009 |
20090252263 | ESTIMATING DOPPLER FREQUENCY IN ISDB-T SYSTEMS - A technique for estimating maximum Doppler frequency of a wireless signal in a wireless communication system, wherein the method comprises receiving a wireless signal; determining an impulse response of the received wireless signal; determining an auto-correlation function (ACF) value of the impulse response of the received wireless signal; determining a power spectrum density of said received wireless signal based on the ACF value; and selecting an algorithm for performing demodulation of the received wireless signal by utilizing the determined power spectrum density. | 10-08-2009 |
20090252262 | SYMMETRIC PILOT PROCESSING FOR ROBUST TIMING OFFSET AND FREQUENCY OFFSET ESTIMATION IN ISDB-T AND ISDB-TSB RECEIVERS - Timing and frequency offset processing in sub-carriers is performed in an Integrated Services Digital Broadcasting-Terrestrial (ISDB-T) receiver system. Sub-carriers are divided into two sub-sets, where the sub-sets contain an equal number of sub-carriers. Subsequently bad sub-carriers are removed, if present, from first sub-set of the sub-sets, and corresponding sub-carriers from a second sub-set of the sub-sets are also removed. Further, a phase difference on each sub-carrier from each sub-set is computed, and mean phase differences of each of the sub-sets are computed. Furthermore, frequency offset is computed by averaging the mean phase differences of the sets. | 10-08-2009 |
20090252256 | FAST ACQUISITION IN MEDIAFLO SYSTEMS - A technique of acquisition in a MediaFLO™ (Forward Link Only) mobile multimedia multicast system, wherein the method comprises receiving a superframe comprising a first digital symbol in a receiver operating in a first state of operation; assuming the first received digital symbol to be a Time Division Multiplexed (TDM) pilot symbol; calculating a first sparseness index of the first symbol; storing the first sparseness index; operating the receiver in a second state of operation; receiving a second digital symbol; calculating a second sparseness index for the second digital symbol; the receiver remaining in the second state of operation when the second sparseness index is greater than the first sparseness index, wherein the second digital symbol is assumed to be the TDM pilot symbol; and verifying that the last assumed TDM pilot symbol is the correct TDM pilot of the superframe. | 10-08-2009 |
20090252239 | ROBUST FINE FREQUENCY AND TIME ESTIMATION IN MEDIALFLO SYSTEM RECEIVERS - A technique for estimating a carrier frequency offset and a timing offset in a MediaFLO™ (Forward Link Only) system, wherein the method comprises receiving Orthogonal Frequency Division Multiplexing (OFDM) symbols; interpolating pilots on odd or even symbols of the received OFDM symbols; determining a phase difference between two successive symbols using the interpolated pilots; obtaining an estimate of the carrier frequency offset and the timing offset from the determined phase difference between two successive symbols; and correcting a sampling frequency in accordance with the estimated carrier frequency offset and timing offset. | 10-08-2009 |
20090252238 | RE-ACQUISITION OF SYMBOL INDEX IN THE PRESENCE OF SLEEP TIMER ERRORS FOR MEDIAFLO SYSTEMS - A technique for re-acquiring a symbol index in the presence of sleep timer errors in a MediaFLO™ (Forward Link Only) mobile multimedia multicast system comprising a receiver and a transmitter, wherein the method comprises receiving a digital signal comprising a superframe comprising one or more Orthogonal Frequency Division Multiplexing (OFDM) symbols in the receiver comprising a timer; waking up the receiver from a sleep mode of operation by an amount of time equal to a maximum error introduced by the timer plus a time to reacquire a beginning of each OFDM symbol plus a time to reacquire a symbol index; and reacquiring the symbol index. | 10-08-2009 |
20090252237 | DOUBLE LAYER MAXIMUM RATIO COMBINING FOR OFDM RECEIVER DESIGN WITH INTER-CARRIER-INTERFERENCE CANCELLING - An apparatus, method, and system for reducing a C/N in an OFDM receiver using diversity combining techniques in the presence of ICI, wherein the apparatus comprises an encoded data estimator adapted to estimate data received in the OFDM receiver; a pair of ICI estimators operatively connected to the encoded data estimator and adapted to calculate an inter-carrier-interference term of the data; and a pair of diversity combining equalizers adapted to compensate multi-path interference of the data, wherein a first one of the diversity combining equalizers is operatively connected to the encoded data estimator, and a second one of the diversity combining equalizers is operatively connected to the pair of ICI estimators. The diversity combining equalizer may comprise a MRC diversity combining equalizer. Preferably, the encoded data estimator, the pair of ICI estimators, and the pair of diversity combining equalizers are implemented on a DVB-T/H diversity SoC. | 10-08-2009 |
20090252027 | WIC AND LIC ESTIMATION IN MEDIAFLO SYSTEMS - An apparatus and method for WIC/LIC estimation without channel mode construction in a MediaFLO™ system comprising a receiver, a transmitter and transmission channel, wherein the method comprises receiving a signal comprising a MediaFLO™ mobile multimedia multicast system superframe comprising WIC/LIC symbols; setting a first sparseness index value of the digital signal to zero; setting a local copy WIC/LIC number of the digital signal to one; generating a local copy of all possible values of the WIC/LIC symbols corresponding to a WID/LID value from zero to fifteen; dividing the received WIC/LIC symbol values by a local copy WIC/LIC value corresponding to WIC/LIC number one; performing an IFFT of all the possible values of the WIC and LIC symbols; calculating a second sparseness index value of the IFFT of sixteen possible values of the WIC/LIC symbols; and extracting a WIC/LIC symbol from the digital signal corresponding to the second sparseness index. | 10-08-2009 |
20090252026 | TIMING AND FREQUENCY ACQUISITION FOR MEDIAFLO SYSTEMS - An apparatus, logic, and method of performing timing and frequency estimation in a MediaFLO™ mobile multimedia multicast system comprising a receiver and a transmitter, wherein the method comprises receiving a wireless data stream comprising a MediaFLO™ mobile multimedia multicast system superframe comprising Orthogonal Frequency Division Multiplexing (OFDM) symbols; estimating a Fast Fourier Transform (FFT) trigger point for each of the received OFDM symbols; estimating a fine carrier frequency offset of each OFDM symbol; determining the start of the MediaFLO™ mobile multimedia multicast system superframe by locating a Time Division Multiplexed (TDM) pilot symbol in the superframe; estimating a coarse carrier frequency offset of each of the received OFDM symbols; and synchronizing the receiver to the start of the MediaFLO™ mobile multimedia multicast system superframe and the transmitted OFDM symbols based on the fine carrier frequency offset, the TDM pilot symbol, and the coarse carrier frequency offset. | 10-08-2009 |
20090232264 | LOW COMPLEXITY HIGH PERFORMANCE TMCC ACQUISITION IN ISDB-T AND ISDB-TSB RECEIVERS - A method of TMCC information acquisition in an ISDB-T/TSB receiver comprises detecting coarse frequency offset in the receiver to identify bins that have TMCC information; and acquiring TMCC and symbol number information from the identified bins. The detecting process may be conducted using different methods and the acquiring process may be conducted using different methods. The TMCC information acquisition method saves memory space and provides enhanced performance by using coarse frequency offset to identify the bins that have TMCC information and obtaining the TMCC and symbol number information from the identified bins. | 09-17-2009 |
20090232256 | ITERATIVE DECODING FOR LAYER CODED OFDM COMMUNICATION SYSTEMS - A modified classical Viterbi decoder which can take extrinsic information and output hard decisions. A modified Viterbi decoder is provided comprising a branch metric unit, the unit having a calculator; and a processor adapted to compute a revised branch metric by combining the initial branch metric and an additional weight parameter. The modified classical Viterbi decoder computes a branch metric by summing an initial branch metric and the additional weight parameter. | 09-17-2009 |
20090222585 | EFFICIENT DECODING OF MEDIAFLO SYSTEM NON REAL-TIME SERVICE FILES - A technique for decoding code packets of file delivery protocol (FDP) and file delivery control protocol (FDCP) messages, the FDP messages comprising fields having values used to generate an indices of a data packets, the FDCP messages comprising a value of a minimum number of code packets required, the code packets formed from a linear combination of the data packets of a file fragment, the method includes constructing data structures adapted to decode the code packets of the file fragment, the data structures comprising at least one of code nodes, a code graph, an inverse code graph, a data packet decode array, and a data packet decode order list, processing the FDP messages until a parameters required for decoding are extracted, and populating the inverse code graph with a reference to the code node. | 09-03-2009 |
20090221255 | DIGITAL APPROACH FOR IMAGE REJECTION CORRECTION IN LOW INTERMEDIATE FREQUENCY CONVERSION TUNER - A method of processing an in-phase signal component and a quadrature signal component of a low intermediate frequency (LIF) signal includes estimating and correcting an amplitude imbalance between a digitized in-phase signal component and a digitized quadrature signal component at a first point in time, and estimating and correcting a phase imbalance between the digitized in-phase signal component and the digitized quadrature signal component at a second point in time in response to the correcting process. The digitized in-phase signal component corresponds to the in-phase signal component at the first point in time and the digitized quadrature signal component corresponds to the quadrature signal component at the first point in time. The second point in the time is subsequent to the first point in time. | 09-03-2009 |
20090220015 | COARSE CARRIER FREQUENCY OFFSET ESTIMATION FOR CMMB MOBILE TV RECEIVER - A method of estimating coarse frequency offset of received symbols based on a received frequency domain sample at a k | 09-03-2009 |
20090213943 | TIME AND FREQUENCY DOMAIN BASED APPROACHES FOR FINE TIMING AND FREQUENCY ESTIMATIONS IN ISDB-T AND ISDB-TSB RECEIVER DESIGN - A method and apparatus for estimating timing and frequency offsets in an ISDB-T and ISDB-TSB receiver. In different embodiments, the method comprises estimating timing and frequency offsets by different estimation processes; assigning weights to the timing and frequency offsets according to the channel condition; and calculating timing and frequency offsets using the estimates of timing and frequency offsets and the weights. | 08-27-2009 |
20090213831 | FAST AUDIO/VISUAL RECEPTION IN DVB-H SYSTEMS - An apparatus and method of reducing a channel switching delay in TDM mobile television systems, and comprises receiving a data burst associated with channels for reception on a RF channel bandwidth received on a mobile television receiver, wherein the data burst comprises a plurality of RTP packets and a RTCP packet; buffering the data burst upon reception of a first RTP packet; synchronizing the buffered data burst to allow for reception of playable A/V data; and adjusting the synchronized buffered data burst upon reception of the RTCP packet. The method may further comprise performing the synchronizing upon reception of the RTCP packet. The method may further comprise inserting a null packet in the data burst prior to performing the buffering. The first RTP packet is preferably received prior to reception of the RTCP packet. | 08-27-2009 |
20090207311 | TECHNIQUE FOR TUNER AUTOMATIC GAIN CONTROL CIRCUIT FOR MOBILE TELEVISION APPLICATIONS - A technique for providing stable tracking performance to an AGC loop circuit comprises amplifying a wideband radio frequency signal; detecting signals and blockers adjacent to the radio frequency signal; lowering a gain of the radio frequency signal; mixing a local oscillator signal with the radio frequency signal; shifting a frequency of the radio frequency signal from a radio frequency to an intermediate frequency; continuously varying a gain of the intermediate frequency signal; converting the intermediate frequency signal into a digital output signal; comparing the digital output signal with predefined thresholds comprising an upper threshold and a lower threshold; switching a post mixer amplifier (PMA) to a high gain state when an input of a variable gain amplifier (VGA) is greater than the upper threshold, and switching the PMA to a low gain state when an input of the VGA is lower than the lower threshold. | 08-20-2009 |
20090187946 | FAST CHANNEL SWITCHING FOR ENCRYPTED MEDIAFLO MOBILE MULTIMEDIA MULTICAST SYSTEM - Enhancing a stream layer transmission for a MediaFLO™ mobile multimedia multicast system comprising a transmitter and a receiver. Code word (CW) computations are performed on a current channel being accessed by the receiver. A favorite channel that a user is statistically mostly likely to switch to on the receiver at any particular time is anticipated. The Overhead Information Symbols (OIS) for each favorite channel is periodically monitored. The receiver remains in a sleep mode while data bursts are received from non-favorite channels, and then wakes up during data bursts of the favorite channel. The same CW computations are performed on the favorite channel as were being performed on the current channel. A cyclic redundancy check (CRC) is performed once the CW computations are performed upon selecting the favorite channel. | 07-23-2009 |
20090154547 | SCATTERED PILOT CORRELATION IN DVB-H SYSTEMS - A method for correlating scattered pilot locations in a sequence of OFDM symbols in a multi-carrier transmission system, and includes mapping pilot locations comprising pilot symbols having predetermined known values, wherein the pilot symbols are positioned among data subcarriers in time and frequency dimensions consisting of received pilot symbols and having a predetermined position pattern in the time and frequency dimensions, wherein the predetermined position pattern comprises a finite number of sub-position patterns each corresponding to positions of the pilot symbols; estimating a Doppler spread in a frequency spectrum between the transmitter and the receiver in the multi-carrier transmission system; estimating a channel length of a set of channel paths received at the receiver; and the receiver automatically selecting one of a plurality of predetermined methods of correlating the scattered pilot locations in the sequence of OFDM symbols based only on the estimating processes. | 06-18-2009 |
20080242252 | WIDEBAND RESISTIVE IMPUT MIXER WITH NOISE-CANCELLED IMPEDANCE - A radio frequency (RF) mixing circuit including a quadrature mixer that receives non-overlapping in-phase and quadrature local oscillator (LO) signals, and a plurality of low noise amplifiers (LNAs) operatively connected to the quadrature mixer, the plurality of LNAs presenting an input impedance at a baseband. A first voltage at an input node of the quadrature mixer is equal to a second voltage across the (noise cancelled) impedance up-converted to a frequency of a LO signal received by the quadrature mixer. The second voltage across the LNA input impedance includes a frequency of an input signal of the quadrature mixer down-converted by a frequency of the in-phase and quadrature LO signals and filtered by the (noise cancelled) impedance. The quadrature mixer down-converts an input signal by a frequency of the in-phase and quadrature LO signals and transfers the noise cancelled impedance to a RF to achieve a noise cancelled match. | 10-02-2008 |