Entries |
Document | Title | Date |
20080205488 | Differential Phase Coding in Wireless Communication System - In a wireless communications system, such as a multiband Ultra Wideband communications system, data is tranmitted by means of the phases of pulses in multiple frequency bands. Data is encoded in the phase difference between a pulse and a previously transmitted pulse. The previously transmitted pulse may be the immediately preceding pulse in the same frequency band, or may be separated from the present pulse by a number of intervening pulses. | 08-28-2008 |
20080232432 | NON-COHERENT TRANSMISSION METHOD FOR UPLINK CONTROL SIGNALS USING A CONSTANT AMPLITUDE ZERO-AUTOCORRELATION SEQUENCE - In one embodiment of the instant invention, a non-coherent transmission method for uplink control signals is provided. The transmission methodology uses a constant amplitude zero-autocorrelation (CAZAC) sequence for relatively short control signal lengths. The methodology includes creating a CAZAC sequence, truncating the CAZAC sequence into a plurality of segments; and transmitting each of the segments within a predetermined window of time. | 09-25-2008 |
20080232433 | SYSTEM AND METHOD FOR SHORT RANGE COMMUNICATION USING ADAPTIVE CHANNEL INTERVALS - A system and method for data transmission on wireless discontinuous channels including a control/safety information (CSI) channel having a duty cycle, and a plurality of service channels. The system and method include: evaluating channel utilization of one or more of the channels; calculating an optimal CSI channel duty cycle responsive to the channel utilizations; adjusting the duty cycle of the CSI channel to the calculated optimal CSI channel duty cycle; broadcasting the optimal CSI channel duty cycle; and transmitting data during the optimal CSI channel duty cycle. | 09-25-2008 |
20080232434 | Means for low probability of interception/detection underwater acoustic communications - A direct-sequence spread-spectrum communications method of de-spreading and decoding received data transmitted through an acoustic channel. A first code match filter is applied to received data to output a first code impulse response comprising a channel impulse response modulated by a pseudo-random number bit. A second code match filter is applied to the received data to output a second code impulse response comprising the channel impulse response modulated by a message symbol bit. The first code impulse response is correlated with the second code impulse response to output the message symbol bit modulated by the pseudo-random number bit. The pseudo-random number bit is eliminated to identify the message symbol bit, thereby decoding the message symbol bit from the received data. | 09-25-2008 |
20080260001 | Time-multiplexed binary offset carrier signaling and processing - Methods and systems for direct sequence spread spectrum (DSSS) signals are described herein. In an embodiment, a DSSS signal includes a time multiplexed spreading time series. The time multiplexed spreading time series includes a data spreading time series includes at least a first spreading symbol, and a pilot spreading time series includes at least a second spreading symbol and a third spreading symbol. The second spreading symbol and the third spreading symbol are different. | 10-23-2008 |
20080298435 | Common Air Interface Supporting Single Carrier and OFDM - A matched filter is configured for matching an input signal to a plurality of programmable-length complementary Golay-code pairs. The matched filter includes a sequence of delay elements configured for delaying the input signal with respect to at least one delay vector. A sequence of programmable seed vector insertion elements is configured for multiplying the input signal and delayed versions of the input signal by a set of seed-vector values. At least one of the seed-vector values may be set to zero to facilitate processing Golay codes having different lengths. | 12-04-2008 |
20080304551 | Methods and Apparatus for Overlaying Multi-Carrier and Direct Sequence Spread Spectrum Signals in a Broadband Wireless Communication System - A broadband wireless communication system, wherein both Multi-Carrier (MC) and Direct Sequence Spread Spectrum (DSSS) signals are intentionally overlaid together, in both time and frequency domains. The overlaying mitigates the weaknesses of each technique. The MC signal carries the broadband data signal and takes advantage of its high spectral efficiency, while the DSSS signal is used for special purpose processing such as initial random access, channel probing, and short messaging, where properties such as signal simplicity, self synchronization, and performance under severe interference are desired. The methods and techniques ensure that the MC and the DSSS signals are both distinguishable and that the interference between the overlaid signals is minimized to have insignificant impact on the expected performance of either signal. | 12-11-2008 |
20090060004 | SEQUENCE HOPPING IN SC-FDMA COMMUNICATION SYSTEMS - A method and apparatus are provided for the selection of sequences used for the transmission of signals from user equipments in a cellular communication system. The sequences can be selected either through planning or through pseudo-random hopping among a set of sequences. With planning, the serving Node B signals the sequence assignment for each cell, which remains invariable in time. With pseudo-random sequence hopping, which has the same pattern in all cells, the serving Node B signals the initial sequence, from a set of sequences, which can be different among cells. The signals can be transmitted either through a data channel or through a control channel. The initial sequence used in the control (or data) channel is signaled by the serving Node B. The initial sequence used in the data (or control) channel is selected to be the sequence in a set of sequences with number equal to a shift value relative to the first sequence as signaled by the serving Node B for the control (or data) channel. | 03-05-2009 |
20090168848 | SINGLE CHIP LOW POWER FULLY INTEGRATED 802.15.4 RADIO PLATFORM - A single chip radio platform is disclosed for communicating with an RE channel. An RF front end is provided having a receive/transmit capability to receive an RF carrier modulated with digital data and convert the data to analog baseband data, and modulate an RF carrier with baseband data. A digital signal processor (DSP) engine is provided for interfacing with the RF front end to form in conjunction therewith the PHY layer, and interfacing with the MAC layer to demodulate the baseband data and in the transmit mode to generate the baseband data for modulation and transmission by the RF front end. A microcontroller unit (MCU) is provided for performing the functionality of the MAC, network and application layers and interfacing with the DSP. Clock circuitry is provided including a stable reference clock for generating a first fixed clock for providing MCU clocks for the operation of the MCU, and for providing a reference for a local oscillator at substantially the channel frequency for use by the RF front end and a DSP clock for use by the DSP, both the MCU clocks, the local oscillator and the DSP clock having the stability of the first fixed clock. Periodic power management circuitry is provided for controlling the operation of the radio platform to operate in a sleep. | 07-02-2009 |
20090168849 | METHOD AND APPARATUS FOR SYMBOL SYNCHRONIZATION FOR AN 802.15.4 RADIO PLATFORM - A single chip radio platform is disclosed for communicating with an RF channel. An RF front end is provided having a receive/transmit capability to receive an RF carrier modulated with digital data and convert the data to analog baseband data, and modulate an RF carrier with baseband data. A digital signal processor (DSP) engine is provided for interfacing with the RF front end to form in conjunction therewith the PHY layer, and interfacing with the MAC layer to demodulate the baseband data and in the transmit mode to generate the baseband data for modulation and transmission by the RF front end. A microcontroller unit (MCU) is provided for performing the functionality of the MAC, network and application layers and interfacing with the DSP. Clock circuitry is provided including a stable reference clock for generating a first fixed clock for providing MCU clocks for the operation of the MCU, and for providing a reference for a local oscillator at substantially the channel frequency for use by the RF front end and a DSP clock for use by the DSP, both the MCU clocks, the local oscillator and the DSP clock having the stability of the first fixed clock. Periodic power management circuitry is provided for controlling the operation of the radio platform to operate in a sleep. | 07-02-2009 |
20090168850 | METHOD AND APPARATUS FOR IMPROVING NETWORK ACCESS THROUGH MULTI-STAGE SIGNALING - Various embodiments are described for improving network access through multi-stage signaling. Logic flow diagram | 07-02-2009 |
20090213903 | SYSTEM AND METHOD FOR MULTIPLE INPUT MULTIPLE OUTPUT WIRELESS TRANSMISSION - Systems and methods for MIMO wireless transmission are provided. At the transmitter, a plurality of encoded packets are modulated, and the symbols are divided between several transmit antennas. The transmitter spreads some of the symbols of each packet using a respective subset of an available Walsh code space. A given transmit antenna then transmits part of each packet spread by the respective subset. In some implementations, this achieves the benefits of the PARC system, and at the same time achieves part of the benefits of the STTD system. Advantageously, only a single reverse link control channel is required if adaptive coding and modulation is to be performed. | 08-27-2009 |
20090304045 | Method and Device for Transmitting Data Between a Communication Network Unit and a Plurality of Communication Devices - A method for transmitting data between a communication network unit and a plurality of communication devices is provided, comprising using a plurality of carrier signals grouped into at least one carrier signal group, determining a subset of communication devices of the plurality of communication devices, and using the at least one carrier signal group for data transmission between the communication network and the communication devices of the subset of communication devices. | 12-10-2009 |
20100046586 | Method and system for performing distance measuring and direction finding using ultrawide bandwitdh transmissions - A method is provided for enabling a device function at a local device based on distance information, comprising: establishing a communication link with a remote device over a UWB medium using a multiple access protocol; determining a distance between the local device and the remote device; and controlling a device function for the remote device based on the determined distance, wherein the operation of controlling the device function enables the device function when the determined distance is below a set distance threshold, and wherein the operation of controlling the device function disables the device function when the determined distance is above the set distance threshold. | 02-25-2010 |
20100074306 | SPREADING CODE OPTIMIZATION BASED ON QUALITY FACTORS - What is disclosed is a method of operating a communication system. The method includes receiving a request to initiate a communication session with a wireless communication device, wherein the request indicates an application type. The method also includes determining a spreading code based on the application type, and transferring the spreading code to the wireless communication device. The method also includes receiving communications for the communication session encoded with the spreading code and decoding the encoded communications based on the spreading code. | 03-25-2010 |
20100080266 | Physical Layer Data Unit Format - In a wireless communication system wherein communication devices exchange information utilizing data units that conform to a first format, wherein the first format includes a short training field (STF) spread with a first spread code and a first cover code, a method is for generating a physical layer (PHY) data unit that conforms to a second format, wherein the PHY data unit is for transmitting PHY information. A first portion of the PHY data unit is generated to indicate the PHY data unit conforms to the second format, wherein the first portion of the PHY data unit includes an STF spread with at least one of a second spread code different than the first spread code or a second cover code different than the first cover code. A second portion of the PHY data unit is generated according to the second format, wherein the second portion of the PHY data unit includes PHY information elements not specified by the first format. | 04-01-2010 |
20100118919 | WIRELESS COMMUNICATION APPARATUS AND RESPONSE SIGNAL SPREADING METHOD - A wireless communication apparatus capable of minimizing the degradation in separation characteristic of a code multiplexed response signal. In this apparatus, a control part ( | 05-13-2010 |
20100142588 | PARALLEL SEQUENCE SPREAD SPECTRUM TYPE CHAOTIC SIGNAL TRANSMISSION DEVICE - A parallel sequence spread spectrum type chaotic signal transmission device is disclosed to convert a serial data signal into a parallel data signal and transmit a chaotic signal according to the converted data signal. The parallel sequence spread spectrum type chaotic signal transmission device includes: a signal converting unit that converts serial data desired to be transmitted into parallel data having a pre-set unit; a chaotic signal generating unit that generates a pre-set chaotic signal; and an amplifying unit that amplifies the chaotic signal from the chaotic signal generating unit according to the data which has been converted by the signal converting unit. | 06-10-2010 |
20100166040 | METHOD AND SYSTEM FOR ADAPTING AN EFFECTIVE SPREADING SEQUENCE IN A COMMUNICATION SYSTEM USING DIRECT SEQUENCE SPREADING - A method and system for adapting an effective spreading sequence in a wire-line or a wireless communication system using direct sequence spreading system is described. A station of the communication system determines a state of a communication channel, represented by, e.g., an impulse response, a step response, or any other characteristic known to one skilled in the art. The station determines the channel state by measurements of a received signal or by receiving a feedback signal comprising an information enabling the station to determine the plurality of linearly related phases The station then determines a plurality of linearly related phases in accordance with the state of the communication channel, and then applies at least one of the plurality of linearly related phases to at least one sample of the effective spreading sequence. | 07-01-2010 |
20100195702 | RADIO COMMUNICATION DEVICE AND RESPONSE SIGNAL SPREADING METHOD - A radio communication device capable of randomizing both inter-cell interference and intra-cell interference. In this device, a spreading section ( | 08-05-2010 |
20100215077 | Multi-Band OFDM Communications System - A method for providing communication in a wireless network comprising one or more simultaneously operating pico networks includes dividing UWB spectrum into a plurality of frequency bands. These bands are formed into band groups. At least one band group is assigned to each one of the pico networks. At least pne time frequency code is assigned to symbols associated with each one of the pico networks on a transmission-by-transmission basis. A system for channelization of the spectrum includes a frequency-synthesized oscillator and a time frequency code generator configured to assign time-frequency codes to successive transmissions of a pico network such that the successive transmissions are transmitted in all frequency bands of a band group assigned to the pico network. | 08-26-2010 |
20100226414 | System and a Method for Wireless Transmission and Reception of Concatenated Impulse Radio Ultra-Wideband Data Bursts - The present invention relates to a wireless communications system, in particular to a method for transmitting and receiving concatenated data bursts in a wireless communications system. The invention is particularly useful in the field of impulse-based ultra-wideband systems. In an aspect of the invention, a transmitting device is presented for generating and transmitting concatenated bursts or string. In another aspect of the invention, a receiving device is presented for receiving the string. The receiving device further uses frequency domain equalization approach to mitigate inter-symbol interference within the string. | 09-09-2010 |
20100232475 | Equal Power Output Spatial Spreading Matrix for Use in a Wireless MIMO Communication System - A spatial spreading unit is configured to utilize a spatial spreading matrix to distribute two or more encoded spatial data streams to transmission antennas. The spatial spreading matrix has components (i) associated with each row of a row dimension having a number of rows equal to the number of the transmission antennas to be used to transmit the encoded spatial data streams and (ii) associated with each column of a column dimension having a number of columns equal to the number of the encoded spatial data streams to be transmitted. Additionally, the spatial spreading matrix satisfies one or more of the following two constraints: (1) the ratio of squared norms of the sum of the components of a row, for different rows of the spatial spreading matrix, is equal to a first constant sequence, and (2) the ratio of squared norms of the sum of a symbol Sl to be transmitted, when the symbol Sl is equal to 1 or −1, multiplied by each of the components of a row, for different rows of the spatial spreading matrix, is equal to a second constant sequence. | 09-16-2010 |
20100272154 | SPREAD-SPECTRUM MODULATION AND DEMODULATION - Certain aspects of the present disclosure relate to a method for modulating and demodulating a spread-spectrum data stream using multiple generalized Golay codes. | 10-28-2010 |
20100296550 | METHOD OF SPACE TIME CODING WITH LOW PAPR FOR MULTIPLE ANTENNA COMMUNICATION SYSTEM OF THE UWB PULSE TYPE - A method of space time coding for UWB transmission system including a plurality of radiative elements, the method coding a block of information symbols S=(σ | 11-25-2010 |
20100309954 | SYSTEMS AND METHODS FOR USING CODE SPACE IN SPREAD-SPECTRUM COMMUNICATIONS - Systems and methods for improving the performance of direct-sequence spread-spectrum communication systems. In one embodiment, a system comprises at least one communication channel that utilizes two different orthogonal spreading codes and corresponding portions of the available orthogonal code space. Portions of the data processed by the communication channel are demultiplexed into different streams and covered with corresponding, different orthogonal spreading codes. The streams covered by the different orthogonal codes are then combined and transmitted via the same communication channel. One embodiment utilizes at least two different Walsh codes of different lengths (+− and ++−−) in order to make use of the three quarters of the Walsh space not utilized by low-rate legacy channels. | 12-09-2010 |
20110002363 | Method and Apparatus for Generating Scrambling Codes - Wireless transmission techniques are described, including techniques used to generate scrambling codes for use in wireless transmissions, such as spread spectrum transmissions. In some embodiments, scrambling codes may be iteratively generated using multiplicative factors. The multiplicative factors may be predetermined and stored in advance, reducing processing time when the codes are needed. The multiplicative factor iterations may involve predetermined algorithms, such as squaring and powers of two iterations. | 01-06-2011 |
20110051781 | MODULATION SIGNALS FOR A SATELLITE NAVIGATION SYSTEM - A method of generating a subcarrier modulation signal for modulating a further signal, the method involving multiplexing or selectively combining portions of first and second subcarriers to produce the subcarrier modulation signal. | 03-03-2011 |
20110051782 | Method, System and Apparatus for Wideband Signal Processing - Embodiments include methods, systems, and apparatuses capable of dynamically and adaptively operating on wideband signals. Examples include state variable filters whose center frequencies can be tuned using variable gain blocks coupled to outputs of filter integrators. First- and second-order state variable filters may operate on signals in parallel and their outputs combined to produce a filtered output. Filters may be tuned to pass or reject signals depending on the application; sample applications include, but are not limited to: agile filtering; spectrum analysis; interference detection and rejection; equalization; direct intermediate-frequency transmission; and single-sideband modulation and demodulation. | 03-03-2011 |
20110075705 | Frequency Tracking Method and Apparatus Applied to Positioning System - A frequency tracking method applied to a positioning system is provided. The method includes receiving a baseband signal, the baseband signal includes a line of sight (LOS) signal and a multipath signal; generating a cost function according to equal step frequencies, the baseband signal and a signal average energy; and generating an estimated LOS frequency according to the cost function. | 03-31-2011 |
20110110399 | BUFFER-BASED GENERATION OF OVSF CODE SEQUENCES - In one embodiment, a buffer-based method for generating codes (such as Orthogonal Variable Spreading Factor (OVSF) codes) for spreading and despreading data, without using a chip-rate counter. First, a buffer is populated with initial values based on a received spreading factor and desired code index. Next, a timing strobe is received, and the values in the buffer are changed upon receipt of the timing strobe based on an algorithm that is independent of any count value associated with the timing strobe. Finally, a code sequence value is generated based on the values in the buffer. | 05-12-2011 |
20110164660 | RADIO BASE STATION ACCOMMODATING METHOD AND NETWORK DEVICE - A radio base station accommodating method according to the present invention includes step A of causing a network device | 07-07-2011 |
20110216809 | Approach For Managing The Use Of Communications Channels Based On Performance - An approach for selecting sets of communications channels involves determining the performance of communications channels. A set of channels is selected based on the results of performance testing and specified criteria. The participant generates data that identifies the selected set of channels and provides that data to other participants of the communications network. The participants communicate over the set of channels, such as by using a frequency hopping protocol. When a specified time expires or monitoring of the performance of the channel set identifies poor performance of the set of channels, the participant selects another set of channels for use in communications based on additional performance testing. By selecting channels based on the initial performance testing and performance monitoring, the communications network adaptively avoids channels with poor performance. | 09-08-2011 |
20110243193 | SENDING APPARATUS, RECEPTION APPARATUS, WIRELESS APPARATUS AND TRANSMISSION MODE CONTROL METHOD FOR SENDING APPARATUS - [Object] To enable reduction of electrical power consumption and efficient use of channels. | 10-06-2011 |
20110243194 | HYBRIDIZATION DEVICE WITH SEGREGATED KALMAN FILTERS - The invention relates according to a first aspect to a hybridization device ( | 10-06-2011 |
20110280284 | WIRELESS COMMUNICATION TERMINAL DEVICE AND METHOD OF SIGNAL DIFFUSION - Disclosed is a wireless communication terminal device that is capable of preventing inter-coding interference upon each of a plurality of base stations, even when the timing changes for a transmission of a control signal that is CoMP received by the plurality of base stations. Upon the device, a diffusion unit ( | 11-17-2011 |
20110305261 | BASE STATION AND MOBILE STATION COMMUNICATING WITH OFDM SYSTEM USING A PLURALITY OF SUBCARRIERS AND COMMUNICATION METHOD WITH OFDM SYSTEM USING A PLURALITY OF SUBCARRIERS - A multicarrier communication apparatus that is capable of suppressing interference of feedback information with other channels and alleviating a reduction in an uplink capacity. In PL signal reception section ( | 12-15-2011 |
20110317743 | SPREAD SPECTRUM WIRELESS COMMUNICATION CODE FOR DATA CENTER ENVIRONMENTS - A method for wirelessly transmitting management data without cables in a data center is provided. Management data is obtained at a device in the data center. A wireless management data signal is generated from the management data. The wireless management data signal is configured to be transmitted at frequencies matching an ambient electromagnetic noise emitted by the data center, such that the wireless management data signal is masked in the ambient electromagnetic noise emitted by the data center. The wireless management data signal is wirelessly transmitted to another device. | 12-29-2011 |
20110317744 | SYSTEM AND METHOD FOR SPREAD SPECTRUM ACOUSTIC COMMUNICATION - Systems and methods for communicating with acoustic signals and, more particularly, systems and methods for communicating using direct-sequence spread spectrum acoustic waves generated by non-impulsive sources. A data signal is modulated by a pseudorandom noise signal and the modulated spread spectrum signal is coupled to a transmission medium for propagation of an acoustic wave through the medium. Acoustic signals are received from the medium and are possessed to obtain a transmitted data signal. | 12-29-2011 |
20110317745 | MOBILE COMMUNICATION SYSTEM, RADIO BASE STATION, AND MOBILE STATION - In a mobile communication system according to the present invention, a reference signal sequence includes a plurality of signal sequences assigned in slot units in the predetermined physical channel based on a hopping pattern and a sequence shift pattern; the hopping pattern is configured to be determined based on a slot number and an SFN in the predetermined physical channel or the predetermined physical signal; the sequence shift pattern is configured to be determined based on the identification information of the cell to which the predetermined physical channel or the predetermined physical signal has been set; and the hopping cycle is configured to be determined based on a cycle of the slot number and an SFN cycle. | 12-29-2011 |
20120002705 | MOBILE COMMUNICATION SYSTEM AND OPERATION METHOD IN MOBILE COMMUNICATION - A mobile communication system includes: a base station configured to form a cell and transmit a downlink signal which has been spread with a downlink scrambling code, toward the cell; a mobile station connected with the base station by radio when the mobile station is in the cell, and configured to communicate with a counter side station through the base station; and a relay station configured to receive the downlink signal, generate a limitation downlink signal showing a limitation area in which a function of the mobile station is limited, based on the downlink signal, and transmit the limitation downlink signal which has been spread with a specific scrambling code different from the downlink scrambling code, toward the limitation area. The downlink signal contains a base station peripheral cell list showing a scrambling code used in another base station on a periphery of the base station. The relay station determines the specific scrambling code based on the base station peripheral cell list when receiving the downlink signal. | 01-05-2012 |
20120014415 | TRANSMITTER BEAMFORMING STEERING MATRIX PROCESSING AND STORAGE - A mechanism for processing beamforming steering matrices in a transceiver system. A plurality of beamforming steering matrices associated with a plurality of subcarriers of an RF signal received at the transceiver system are generated. The beamforming steering matrices are compressed and stored. The beamforming steering matrices may also be grouped or sub-sampled prior to being stored. The beamforming steering matrices are decompressed and ungrouped before being applied to data to be transmitted. Prior to ungrouping the beamforming steering matrices, a phase difference between corresponding beamforming steering vectors of consecutive beamforming steering matrices is determined. Phase rotation is performed on the corresponding beamforming steering vectors based on the determined phase difference associated with the corresponding beamforming steering vectors to improve phase continuity between consecutive beamforming steering matrices. | 01-19-2012 |
20120027048 | Method and Arrangement of Delay Spread Compensation - A method of delay spread compensation, suitable for use in a communication device a having plurality of receiver antennas, is disclosed. The method comprises receiving a plurality of signals, each via a respective antenna, wherein each signal comprises a signal component corresponding to a transmitted signal, and wherein each received signal experiences a respective channel impulse response having a corresponding delay spread; determining estimates of each of the channel impulse responses; calculating post-coding characteristics based on the estimates of the channel impulse responses; and post-coding the plurality of received signals using the post-coding characteristics to produce at least a first delay spread compensated signal. Corresponding computer program product, processing arrangement and communication device are also disclosed. | 02-02-2012 |
20120076175 | METHOD AND APPARATUS FOR EFFICIENT GOLD CODE GENERATION AND MANAGEMENT IN WCDMA SYSTEMS - A method and an apparatus for efficient Gold code generation and management in WCDMA systems are presented. Aspects of the method may include simultaneously generating, based on the codeword sequence, a plurality of scrambling code segments associated with a scrambling code. A plurality of scrambling code segments, where each is associated with a corresponding one of a plurality of scrambling codes, may also be simultaneously generated. The plurality of scrambling codes may form a scrambling code group. Based on the codeword sequence, a plurality of time shifted versions of at least one scrambling code segment associated with a scrambling code may also be simultaneously generated. | 03-29-2012 |
20120082187 | System And Method For Detecting Packet Synchronization - A method of providing frame synchronization for GPS signals can include performing coherent bit extraction on the GPS bits and then performing coherent frame boundary detection based on the bits of the coherent bit extraction. Concurrently, differential bit extraction on the GPS bits and differential frame boundary detection based on bits of the differential bit extraction can be performed. Whichever of the coherent frame boundary detection and the differential frame boundary detection first finds a frame boundary, then that frame boundary is used for the frame synchronization. A method of providing string synchronization for GLONASS signals includes performing coherent and differential bit extraction on the GLONASS bits. | 04-05-2012 |
20120327975 | SYSTEMS AND METHODS FOR PULSE ROTATION MODULATION ENCODING AND DECODING | 12-27-2012 |
20130003783 | GLOBAL NAVIGATION SATELLITE SYSTEM RECEIVER WITH FILTER BYPASS MODE FOR IMPROVED SENSITIVITY - A global navigation satellite system receiver with filter bypass mode for improved sensitivity is disclosed. In an aspect, an apparatus is provided that includes a non-bypass signal path coupled to a receiver, the non-bypass signal path comprising a filter. The apparatus also includes a bypass signal path coupled to the receiver, the bypass signal path configure to bypass the filter, and a switch to couple an antenna to the non-bypass signal path during time intervals when signals transmitted by an unrelated local transmitter are transmitted with a signal power that exceeds a selected threshold, and to couple the antenna to the bypass signal path during other time intervals. | 01-03-2013 |
20130142219 | METHOD AND APPARATUS FOR ADDITION DATA TRANSMISSION AND RECEPTION IN DIGITAL BROADCAST SYSTEM - Provided are an apparatus for addition data transmission includes: an IF broadcasting signal generating unit receiving the broadcast data, and FEC and modulation of the received broadcast data to generate a broadcasting signal in an intermediate frequency (IF) band; an IF addition signal generating unit receiving the addition data to generate an addition signal in the IF band by using direct sequence spread spectrum (DSSS); an average power controlling unit controlling average power of the addition signal in the IF band; a signal combining unit combining the broadcasting signal in the IF band and the addition signal in the IF band to generate a combination signal; an RF upward converting unit upwardly converting the combination signal in a signal in a radio frequency (RF) band to a combination signal in the RF band; and a transmitting unit transmitting the combination signal in the RF band. | 06-06-2013 |
20130336365 | APPARATUS AND METHOD FOR MODULATING DATA MESSAGE BY EMPLOYING ORTHOGONAL VARIABLE SPREADING FACTOR (OVSF) CODES IN MOBILE COMMUNICATION SYSTEM - A method for converting source data to a channel-modulated signal having a plurality of pairs of in-phase (I) and quadrature-phase (Q) data in a mobile station, wherein the mobile station uses at least one channel, includes the steps of: a) encoding the source data to generate at least one data part and a control part; b) generating at least one spreading code to be allocated to the channel, wherein each spreading code is selected on the basis of a data rate of the data part and the control part and spreading codes are selected so that two consecutive pairs of the I and Q data are correspondent to two points located on same point or symmetrical with respect to a zero point on a phase domain; and c) spreading the control part and the data part by using the spreading code, to thereby generate the channel-modulated signal. | 12-19-2013 |
20140023119 | METHOD AND APPARATUS FOR GENERATING PAIR OF ORTHOGONAL SETS WITH WIDE RANGE OF SPREADING FACTORS - A method of generating a pair of orthogonal sets with a spreading factor N for a direct sequence spread spectrum communication system, includes selecting a two-level autocorrelation sequence of a period of N−1, the two-level autocorrelation sequence including elements, each of which includes a value of 1 or 0, and obtaining binary sequences based on the two-level autocorrelation sequence. The method further includes obtaining quasi-orthogonal sets based on the two-level autocorrelation sequence and the binary sequences, and generating the pair of the orthogonal sets based on the quasi-orthogonal sets. | 01-23-2014 |
20140023120 | SIGNAL PROCESSING APPARATUS, RADAR APPARATUS, AND SIGNAL PROCESSING METHOD - A signal processing apparatus which calculates a correlation value between an input analog signal and a digital code includes: an adder which adds a noise signal to the analog signal; an analog comparator which compares, synchronously with a clock signal having a first period, a magnitude of the analog signal added with the noise signal with a reference voltage; a multiplier which receives an input of a comparison result from the analog comparator and the digital code and calculates, synchronously with the clock signal, an exclusive OR between the comparison result and the digital code; and a counter which accumulates calculation results from the multiplier over a second period in a time series, and calculates, as the correlation value, a difference between an accumulation result and one-half of a quotient of the second period and the first period. | 01-23-2014 |
20140126611 | ORTHOGONAL COMPLEX SPREADING METHOD FOR MULTICHANNEL AND APPARATUS THEREOF - An orthogonal complex spreading method for a multichannel and an apparatus thereof are disclosed. The method includes the steps of complex-summing α | 05-08-2014 |
20140204981 | METHOD FOR OPERATING A UWB DEVICE - The method for operating a UWB device having at least one transmitting antenna and/or at least one receiving antenna comprises the following steps: controlling the transmitting antenna ( | 07-24-2014 |
20140301429 | DATA PROCESSING METHODS PERFORMED BY UMTS-FDD DEVICE - A data processing method performed by a Universal Mobile Telecommunications System Frequency Division Duplexing (UMTS-FDD) device includes at least the following steps: generating a control frame and a data frame, wherein the data frame is spread according to a fixed spreading factor which is not greater than a minimum spreading factor prescribed in a UMTS-FDD Release 99 specification, and the control frame includes a transport format combination indicator (TFCI) data; and transmitting the control frames through an uplink dedicated physical control channel (UL DPCCH) and transmitting the data frames through an uplink dedicated physical data channel (UP DPDCH). | 10-09-2014 |
20140314125 | METHODS AND APPARATUS FOR SIGNAL TRANSMISSION AND RECEPTION IN A BROADBAND COMMUNICATION SYSTEM - In a broadband wireless communication system, a spread spectrum signal is intentionally overlapped with an OFDM signal, in a time domain, a frequency domain, or both. The OFDM signal, which inherently has a high spectral efficiency, is used for carrying broadband data or control information. The spread spectrum signal, which is designed to have a high spread gain for overcoming severe interference, is used for facilitating system functions such as initial random access, channel probing, or short messaging. Methods and techniques are devised to ensure that the mutual interference between the overlapped signals is minimized to have insignificant impact on either signal and that both signals are detectable with expected performance by a receiver. | 10-23-2014 |
20150030055 | APPARATUS AND METHOD FOR MODULATING DATA MESSAGE BY EMPLOYING ORTHOGONAL VARIABLE SPREADING FACTOR (OVSF) CODES IN MOBILE COMMUNICATION SYSTEM - A method for converting source data to a channel-modulated signal having a plurality of pairs of in-phase (I) and quadrature-phase (Q) data in a mobile station, wherein the mobile station uses at least one channel, includes the steps of: a) encoding the source data to generate at least one data part and a control part; b) generating at least one spreading code to be allocated to the channel, wherein each spreading code is selected on the basis of a data rate of the data part and the control part and spreading codes are selected so that two consecutive pairs of the I and Q data are correspondent to two points located on same point or symmetrical with respect to a zero point on a phase domain; and c) spreading the control part and the data part by using the spreading code, to thereby generate the channel-modulated signal. | 01-29-2015 |
20150043620 | MOBILE COMMUNICATION TERMINAL - A mobile communication terminal is provided, which comprises: a first antenna, configured to receive a high-band radio frequency (RF) signal from the outside; a wireless transceiver, configured to acquire the high-band RF signal from the first antenna and generate a first base-band signal; a base-band processor, configured to acquire the first base-band signal from the wireless transceiver and modulate the first base-band signal, and further generate a second base-band signal and a third base-band signal; the wireless transceiver being further configured to convert the second base-band signal into a to-be-transmitted high-band RF signal and convert the third base-band signal into a to-be-transmitted low-band RF signal; a second antenna, configured to acquire and transmit the to-be-transmitted high-band RF signal and the to-be-transmitted low-band RF signal; wherein the second antenna is further configured to receive a low-band RF signal from the outside. In the aforesaid way, noises caused in the receiving frequency band by the transmitting path can be reduced, and the power consumption and the heat generation amount of the system can be further decreased. Meanwhile, the radio frequency architecture is simplified, and a low-cost and more compact space can be obtained. | 02-12-2015 |
20150055687 | METHOD AND DEVICE FOR RECOGNIZING A COMMUNICATING MOBILE TERMINAL - Apparatus for identifying a communicating mobile terminal comprises an electromagnetic coupling device, an ultra-wide-band radio subsystem and a monitoring subsystem. The electromagnetic coupling device defines an exclusive zone for electromagnetic coupling between the device and the communicating mobile terminal, The ultra-wide-band radiofrequency subsystem simulates the availability to communicate with the mobile terminal of at least one base station of a telecommunication network. The monitoring subsystem recognizes a unique digital signature of the communicating mobile terminal implementing samples of an electromagnetic trace of a message sent by the mobile terminal in attempt to connect to a simulated base station. | 02-26-2015 |
20150372712 | ASYMMETRICAL FORWARD/REVERSE TRANSMISSION BANDWIDTH - A wireless communications system employs code-division multiple access information transmission techniques where the uplink and downlink transmission bandwidths are unequal. The higher bandwidth is an integer multiple of the lower bandwidth. The present system requires a base station and a subscriber unit to have two pseudo-random code generators which can be clocked separately. Alignment of the uplink and downlink pseudo-random spreading codes is achieved by truncating the code sequence for the lower speed link at the conclusion of a complete code sequence for the higher speed link. | 12-24-2015 |
20150372715 | ROBUST TIME SHIFT TRACKING UWB RECEIVER - A robust time shift tracking UWB receiver. After translating in baseband by a quadrature demodulator, the received UWB pulsed signal is integrated on successive time windows, and then sampled. The complex samples are then correlated with a coding sequence from the transmitter and then transmitted on the one hand to a phase estimator and a demodulating/detecting module. The latter estimates the symbol emitted and provides it to the estimator which removes the modulation effect for estimating, at each time-symbol, the phase of the complex samples. A phase rotation follow-up module determines a compensated phase rotation and a non-compensated phase rotation from a reference instant. Controlling means deduce from the non-compensated phase rotation a time offset to be applied to the integration windows. | 12-24-2015 |
20150372780 | Method and Apparatus for Allocating and Processing Sequences in Communication System - A method and apparatus for allocating and processing sequences in a communication system is disclosed. The method includes: dividing sequences in a sequence group into multiple sub-groups, each sub-group corresponding to its own mode of occupying time frequency resources; selecting sequences from a candidate sequence collection corresponding to each sub-group to form the sequences in the sub-group by: the sequences in a sub-group i in a sequence group k being composed of n sequences in the candidate sequence collection, the n sequences making a |r | 12-24-2015 |
20160006477 | Semiconductor Integrated Circuit and Radio Communication Terminal Including the Same - A semiconductor integrated circuit includes an operational amplifier that amplifies a voltage difference between an input voltage supplied to an inverting input terminal and a reference voltage supplied to a non-inverting input terminal and outputs an amplified signal, a feedback resistor that performs negative feedback of the amplified signal to the inverting input terminal of the operational amplifier, and a variable resistor unit that sets a current path with a first resistance value in accordance with a control signal between an external input terminal and the inverting input terminal of the operational amplifier, and sets a first alternative path with a second resistance value in accordance with the control signal between a node on the current path and a reference voltage terminal to which the reference voltage is supplied. | 01-07-2016 |
20160056858 | SPREAD SPECTRUM METHOD AND APPARATUS - A spread spectrum communications method is based on time compression in which a sampled message signal at a first rate is transmitted at a higher sampling rate. Robustness is achieved by dividing the signal into overlapping segments, transmitting each segment fast enough so that the segments no longer overlap. The segments are received and the data signal reconstructed by overlap-adding the segments. | 02-25-2016 |
20160112088 | METHODS AND APPARATUS FOR GENERATING COMPOSITE CODE SEQUENCES - Methods and apparatus for generating composite code sequences are disclosed. An example method includes determining, via a determiner, a first number of samples to be contributed into a first unit duration of a composite code sequence from respective first, second, and third component code sequences; based on the first number of samples determined, randomly selecting, via a randomizer, the first number of samples from the respective ones of the first, second, and third component code sequences to enable the selected samples to more accurately represent the respective ones of the first, second, and third component code sequences; and compiling, via a compiler, the selected samples into the first unit duration of the composite code sequence by interspersing a sample from the first component code sequence between samples from the second component code sequence or between samples from the third component code sequence. | 04-21-2016 |