Patent application number | Description | Published |
20120058782 | METHOD AND APPARATUS FOR GENERATING AND USING LOCATION INFORMATION - A method and apparatus for generating and using location information is provided to a user of a mobile device. The method involves obtaining and processing a location history of the mobile device to determine locations of significance; automatically generating potential location identifiers associated with the locations of significance; and prompting, at a determined appropriate time, for user input for refining the set of one or more potential location identifiers into a customized location identifier. | 03-08-2012 |
20120194388 | METHOD AND SYSTEM FOR HEURISTIC LOCATION TRACKING - A method and system for provision of a notification based on location of a target device and heuristic information, the method maintaining, in a storage module, a location profile of a target mobile device based on heuristic information for the target mobile device; receiving the current location of the target mobile device; verifying whether the current location deviates from the location profile; and if the current location deviates from the location profile, triggering a notification to an observer device. | 08-02-2012 |
20130132865 | Social Networking Methods And Apparatus For Use In Facilitating Participation In User-Relevant Social Groups - The A mobile device is associated with a user profile which includes one or more user interests. The device sends a request for identifying social groups in a mobile geographic location. In response to the request, the device receives data identifying a plurality of social group profiles corresponding to a plurality of social groups in the mobile geographic location. The mobile device presents a list of the social groups based on the received data, ranked in accordance with similarity scores. Each similarity score is produced based on both a proximity identified between the mobile and social group geographic locations, and similarities identified between the one or more user and group interests. In response to receiving a user input, the device may enter into the social group and present a chat session interface for a chat session for the selected social group. | 05-23-2013 |
20140329541 | METHOD AND SYSTEM FOR HEURISTIC LOCATION TRACKING - A method and system for provision of a notification based on location of a target device and heuristic information, the method maintaining, in a storage module, a location profile of a target mobile device based on heuristic information for the target mobile device; receiving the current location of the target mobile device; verifying whether the current location deviates from the location profile; and if the current location deviates from the location profile, triggering a notification to an observer device. | 11-06-2014 |
Patent application number | Description | Published |
20110033184 | Side Band Pilot Tone for Digital Signal Processing in Polarization Multiplexed Coherent Optical Communication System - A method comprising generating a plurality of first symbols that correspond to a side band pilot tone (SBPT) signal for a plurality of data streams, mapping the first symbols into a plurality of second symbols that correspond to a plurality of signal components of the polarization multiplexed (PM) optical signal, and transmitting the second symbols in a plurality of data blocks of a PM optical signal. An apparatus comprising at least one processor coupled to a memory and configured to obtain a data block that comprises a plurality of SBPTs in a received PM optical signal, estimate a set of values for a carrier frequency and a polarization state, update a tap weight of a master equalizer based on the estimated set of values, and update a plurality of slave equalizers based on the updated tap weight of the master equalizer. | 02-10-2011 |
20110081150 | Clock Recovery Method for Polarization Multiplexed Coherent Optical Communications - An apparatus comprising a plurality of receivers each configured to receive a plurality of polarized signals, a voltage control oscillator (VCO) coupled to the receivers and configured to control timing and sampling frequency of the polarized signals, and a signal processing component coupled to the receivers and configured to update a plurality of weighted linear factors, wherein the polarized signals and the weighted linear factors are used to obtain a combined signal, and wherein the weighted linear factors are updated using a real part or an imaginary part of the combined signal. Included is a method comprising using a linear factor to combine a plurality of polarized optical signals to provide time recovery information, and updating the linear factor using a combination of the polarized optical signals. | 04-07-2011 |
20110206385 | Method and Apparatus for Frame Detection and Polarization Separation - An optical receiver comprising a frame detector configured to receive a polarized signal comprising a first bit stream and a second bit stream, and further configured to identify a plurality of frames in the first bit stream and the second bit stream using a composite header, and a time-domain equalizer (TDEQ) configured to separate the first bit stream and the second bit stream using a portion of the composite header. | 08-25-2011 |
20120008952 | Method and Apparatus for Carrier Phase Estimation and Correction in a Coherent Optical System - An apparatus comprising a nonlinear lookup unit (NL-LUU) configured to add a phase shift to a signal sample to compensate for pattern dependent phase distortion, and one or more first phase adjustment units coupled to NL-LUU and configured to remove from the signal sample a nonlinear phase error from the NL-LUU, wherein the signal sample corresponds to a received signal polarization component of a polarization multiplexed (PM) coherent signal in a PM coherent optical system. | 01-12-2012 |
20120033965 | Method and Apparatus for Broadband Carrier Frequency and Phase Recovery in Coherent Optical System - A digital apparatus comprising a fast Fourier transform (FFT) module configured to transform a time domain optical signal into a frequency domain optical signal, a circular shifter coupled to the FFT module and configured to provide coarse frequency offset compensation to the frequency domain optical signal based on an estimated frequency offset; and a frequency offset estimation module coupled to the circular shifter and configured to provide the estimated frequency offset based on a power spectrum of the frequency domain optical signal or a data block header autocorrelation of the time domain optical signal. | 02-09-2012 |
20120274364 | Method and Apparatus of Using Time-Domain Interpoolators for Sampling Time Adjustment, Sampling Rate Change, and Sampling Misalignment Compensation in Optical Communications - An apparatus comprising an analog-to-digital converter (ADC); a frequency-domain equalizer (FDEQ); a time-domain interpolator positioned between the ADC and the FDEQ, wherein the time domain interpolator is coupled to the ADC and the FDEQ and configured to perform a time-domain interpolation to compensate a signal sample for a plurality of ADC induced changes. | 11-01-2012 |
20130183034 | Method and Apparatus of Using Digital Equalizer for Cascaded Wavelength Selective Switch Compensation - An apparatus comprising a frequency-domain equalizer that has been iteratively generated to compensate for filtering effects of a wavelength selective switch, wherein the FDEQ is configured to process in a frequency domain digital samples of a polarization multiplexed phase-shift-keying signal that has been transported over an optical channel. | 07-18-2013 |
20130243420 | Method and Apparatus of Using Joint Timing Recovery for a Coherent Optical System - An apparatus and method for performing joint equalization and timing recovery in coherent optical systems. The method includes equalizing signals to generate compensated polarization signals, wherein timing error in a distorted optical signal is calculated based on one of the compensated polarization signals. The method further includes performing resampling polarization signals to correct timing offset in an optical signal based on the calculated timing error. The calculated timing error may also be used to adaptively control one or more operating parameters of an external device. | 09-19-2013 |
20130272704 | Linear Dispersion Polarization-Time Codes and Equalization in Polarization Multiplexed Coherent Optical System - A method of optical communication comprising encoding four modulated symbols to generate four encoded symbols in two orthogonal polarizations and transmitting the four encoded symbols in two successive time slots. An optical communication apparatus comprising a processor configured to receive two sequences of digital symbols in a plurality of time slots, wherein the two sequences correspond to two components of two orthogonal polarizations, wherein one digital symbol per polarization is received in each of the plurality of time slots, divide each of the two sequences into a plurality of groups using a modulo operation of time, wherein each group comprises two digital symbols received in two consecutive time slots, and adaptively equalize the four digital symbols of the two consecutive time slots using a 4×4 matrix to generate four modulated symbols, wherein the 4×4 matrix comprises 16 tap-vectors. | 10-17-2013 |
20130315609 | METHOD WITH IMPROVED PHASE ROBUSTNESS IN COHERENT DETECTED OPTICAL SYSTEM - An optical signal receiver tracks local oscillator frequency offset (LOFO) and compensates for the phase distortion introduced in the received signals as a result of utilizing the local oscillator within a coherent detection scheme. This phase distortion is basically a constant phase rotation caused by the LOFO and implementation of the receiver using coherent detection and a digital interferometer instead of a conventional (yet complex) carrier phase estimation or recovery scheme. With an optical receiver implemented in this manner, the requirement of using a precise local oscillator laser with low frequency offset is less important. | 11-28-2013 |
20140072307 | Channel Estimation for Optical Orthogonal Frequency Division Multiplexing Systems - An apparatus comprising an optical receiver configured to receive a plurality of orthogonal frequency-division-multiplexed (OFDM) symbols comprising a first OFDM symbol and a second OFDM symbol, and a processor coupled to the optical receiver and configured to generate a first decoded signal based on the first OFDM symbol, estimate a plurality of channel parameters adaptively based on the first decoded signal, generate a second decoded signal based on the second OFDM symbol, wherein the second decoded signal is generated using the plurality of channel parameters, and wherein phase recovery is performed on the first OFDM symbol using a number of pilot subcarriers prior to generating the first decoded signal. | 03-13-2014 |
20140341267 | Low-Complexity, Adaptive, Fractionally Spaced Equalizer with Non-Integer Sampling - An apparatus comprising a memory and a processor coupled to the memory, wherein the memory includes instructions that when executed by the processor cause the apparatus to perform the following receive an incoming signal at a sampling rate that is greater than a symbol rate associated with the incoming signal, replicate a plurality of data streams from the incoming signal, apply a plurality of fractional delays for the data streams, and perform an adaptive equalization on a plurality of data blocks generated from the data streams, wherein the fractional delay is applied to the data streams independently of the adaptive equalization, and wherein the adaptive equalization implements taps spaced at a fraction of a symbol interval associated with the incoming signal. | 11-20-2014 |
20150086215 | Bit Loading for Optical Discrete Multi-Tone Transmission - System and method embodiments are provided for bit loading for optical Discrete Multi-Tone Transmission (DMT). In an embodiment, a method for bit loading for optical DMT transmission or reception includes receiving, at a processor, a bit data stream, wherein the bit data stream comprises a plurality of subcarriers; assigning, with the processor, a code rate to each of a plurality of forward error correction (FEC) encoders/decoders according to a mapping of a signal-to-noise-ratio (SNR) to a code rate for each of the subcarriers or subcarrier groups, wherein each FEC encoder/decoder corresponds to a respective one of the subcarriers or a respective subcarrier group; and assigning, with the processor, a modulation format to each subcarrier or each subcarrier group according to a mapping of an SNR for each subcarrier or subcarrier group to a bit number for a corresponding subcarrier or subcarrier group. | 03-26-2015 |
Patent application number | Description | Published |
20080202028 | System For the Conversion of Carbonaceous Fbedstocks to a Gas of a Specified Composition - The present invention provides a carbonaceous feedstock gasification system with integrated control subsystem. The system generally comprises, in various combinations, a gasification reactor vessel (or converter) having one or more processing zones and one or more plasma heat sources, a solid residue handling subsystem, a gas quality conditioning subsystem, as well as an integrated control subsystem for managing the overall energetics of the conversion of the carbonaceous feedstock to energy, as well as maintaining all aspects of the gasification processes at an optimal set point. The gasification system may also optionally comprise a heat recovery subsystem and/or a product gas regulating subsystem. | 08-28-2008 |
20080222956 | System for the Conversion of Coal to a Gas of Specified Composition - The present invention provides a coal gasification system with an integrated control subsystem. The system generally comprises, in various combinations, a gasification reactor vessel (or converter) having one or more processing zones and one or more plasma heat sources, a solid residue handling subsystem, a gas quality conditioning subsystem, as well as an integrated control subsystem for managing the overall energetics of the conversion of coal to energy and maintaining all aspects of the gasification processes at an optimal set point The gasification system may also optionally comprise a heat recovery subsystem and/or a product gas regulating subsystem. | 09-18-2008 |
20120121468 | System For The Conversion Of Carbonaceous Feedstocks To A Gas Of A Specified Composition - The present invention provides a carbonaceous feedstock gasification system with integrated control subsystem. The system generally comprises, in various combinations, a gasification reactor vessel (or converter) having one or more processing zones and one or more plasma heat sources, a solid residue handling subsystem, a gas quality conditioning subsystem, as well as an integrated control subsystem for managing the overall energetics of the conversion of the carbonaceous feedstock to energy, as well as maintaining all aspects of the gasification processes at an optimal set point. The gasification system may also optionally comprise a heat recovery subsystem and/or a product gas regulating subsystem. | 05-17-2012 |
Patent application number | Description | Published |
20110051862 | METHODS AND APPARATUS FOR OFDM SYMBOL SYNCHRONIZATION FOR IN-DOOR DIGITAL TV RECEPTION - A received signal comprises a continuous sequence of symbols φ | 03-03-2011 |
20110116359 | METHODS AND APPARATUS FOR INTERLEAVING IN OFDM/OFDMA SYSTEMS - An interleaver of an OFDM/OFDMA transceiver reshapes a binary vector to be transmitted into a matrix, rotates bits in respective columns of the matrix, divides respective rows of the matrix into an integer number of interleaving blocks, and interleaves the bits in the respective interleaving blocks. | 05-19-2011 |
20110116562 | Digital Communications Receiver and Method of Estimating Residual Carrier Frequency Offset In A Received Signal - A residual carrier frequency offset of a signal received by a receiver, which has a local frequency oscillator that generates a carrier frequency different from a carrier frequency generated by a local frequency oscillator at a transmitter that transmitted the received signal is estimated using first and second channel impulse responses derived from first and second portions of the received signal, an estimated phase difference between the first and second channel impulse responses, and an estimate of the residual carrier frequency offset computed using the estimated phase differences. The residual carrier frequency offset is estimated after most of the carrier frequency offset has been removed from the received signal using conventional means. | 05-19-2011 |
20120127936 | SYSTEMS AND METHODS FOR CHANNEL TRACKING IN OFDMA - Methods and systems which include identifying a needed amount of US bandwidth to be allocated to a user terminal; determining the subcarriers and the number of symbols per subcarrier to be allocated to meet the identified need in a burst; allocating, for the user terminal, a set of subcarriers and a number of symbols for each member of the set of subcarriers, wherein sufficient symbols per subcarrier per burst are allocated to allow user terminal to send two or more pilots per subcarrier per burst; and transmitting a message to the user terminal, the message identifying the allocated subcarriers and the number of symbols allocated for each subcarrier. | 05-24-2012 |
20120314088 | SYSTEM AND METHOD OF IMPLEMENTING A TV BAND DEVICE WITH ENHANCED SPECTRUM SENSING - A TV band device for indoor applications uses information gleaned from a database inquiry based on geo-location information in combination with spectrum sensing to determine if TV channels are available for unlicensed use. | 12-13-2012 |
20120314818 | DIGITAL COMMUNICATIONS RECEIVER AND METHOD OF ESTIMATING RESIDUAL CARRIER FREQUENCY OFFSET IN A RECEIVED SIGNAL - A carrier frequency offset can be present in a signal received by a communications receiver, when the receiver has a local frequency oscillator that generates a carrier frequency different from a carrier frequency generated by a local frequency oscillator at a transmitter that transmitted the signal. A residual carrier frequency offset can remain after most of the carrier frequency offset has been removed from the received signal using conventional techniques. The residual carrier frequency offset is estimated using first and second channel impulse responses derived from first and second portions of the received signal. An estimated phase difference between the first and second channel impulse responses is computed. An estimate of the residual carrier frequency offset is computed using the estimated phase difference. | 12-13-2012 |
20120315855 | SYSTEM AND METHOD OF IMPLEMENTING A COGNITIVE RADIO DEVICE WITH ENHANCED SPECTRUM SENSING - A cognitive radio band device uses information gleaned from a database inquiry based on geo-location information in combination with spectrum sensing to determine if cognitive radio channels are available for unlicensed use. | 12-13-2012 |
20130103684 | TV WHITE SPACE DEVICES USING STRUCTURED DATABASES - A two-level database structure for use by unlicensed TVBD devices operating in TV white space comprises a central database and local databases. The central database comprises two sub-database: the central licensed database which maintains information about all licensed TV devices and the central unlicensed database which maintains information about unlicensed wireless devices operating in TV spectrum. The local database is created by each TVBD device or TVBD network when it initiates and it stores information related to all transmitters in the local area including location, power transmission levels, operating schedule, sensing results, backup channel information. The local databases communicate with central database to query it about licensed usage of TV spectrum and register with central database. The local databases communicate with each other to exchange information about channel usage, sensing results, transmission patterns and other information that will allow the local databases to negotiate coexistence without central coordinator. The locally implemented negotiation prevents the overloading of the central database. | 04-25-2013 |
20130165051 | SYSTEM AND METHOD OF IMPLEMENTING A COGNITIVE RADIO DEVICE WITH ENHANCED SPECTRUM SENSING - A cognitive radio band device uses information gleaned from a database inquiry based on geo-location information in combination with spectrum sensing to determine if cognitive radio channels are available for unlicensed use. | 06-27-2013 |
20140004872 | APPARATUS AND METHOD FOR MERIT BASED COGNITIVE RADIO FREQUENCY RESOURCE ALLOCATION | 01-02-2014 |
20150058377 | TV WHITE SPACE DEVICES USING STRUCTURED DATABASES - A two-level database structure for use by unlicensed TVBD devices operating in TV white space comprises a central database and local databases. The central database comprises two sub-database: the central licensed database which maintains information about all licensed TV devices and the central unlicensed database which maintains information about unlicensed wireless devices operating in TV spectrum. The local database is created by each TVBD device or TVBD network when it initiates and it stores information related to all transmitters in the local area. The local databases communicate with central database to query it about licensed usage of TV spectrum and register with central database. The local databases communicate with each other to exchange information about channel usage, sensing results, transmission patterns and other information that will allow the local databases to negotiate coexistence without central coordinator. The locally implemented negotiation prevents the overloading of the central database. | 02-26-2015 |
Patent application number | Description | Published |
20090262709 | WIRELESS COMMUNICATIONS SYSTEMS AND CHANNEL-SWITCHING METHOD - A wireless communications system and channel-switching method are disclosed herein. A source device and multiple sink devices independently maintain respective counters which track data packet errors. Each device independently switches channels only after its counter reaches a channel-switching threshold. The new channel switched-to is either determined by an indexed ordering of the available channels or by reference to a global clock maintained by each of the devices. Accordingly, all devices quickly arrive at a common channel. The system switches channels only when necessary and resolves quickly to a mutually acceptable channel. Therefore, unnecessary channel switching is minimized and data throughput is optimized. | 10-22-2009 |
20120275493 | Low-Power Class D Amplifier Using Multistate Analog Feedback Loops - An audio amplifier system may include an audio CODEC/output (AOP) path featuring analog class-D amplifiers, and using Natural Sampling Pulse Width Modulation (PWM) to convert an analog input into a series of Rail-to-Rail pulses. The audio signal may be encoded in the average value of the PWM pulse train and may be recovered from the PWM signal by analog low pass filtering. The Class-D amplifiers may be designed with a negative feedback loop/network to compare the output signal with the input signal and suppress non-idealities introduced by the Class-D switching stage. Furthermore, operation of the AOP may be designed according to a separate signal transfer function and a separate noise transfer function, and 2 | 11-01-2012 |
20120276942 | Transmit Power Control Algorithms for Sources and Sinks in a Multi-Link Session - Transmit power control functionality in wireless audio systems may be implemented by way of a Transmit Power Control (TPC) algorithm devised to control power for both source and sinks in a multi sink session, to reduce power consumption. Information may be passed back and forth between the source and sink devices to adjust power based on the shared information. The TPC algorithm may allow power control on both ends of an RF link, and may have multiple sink devices communicating with a source device. Furthermore, the multiple sink devices and the source device may each be operating at different power levels, and adjust their respective power levels as instructed by the TPC algorithm. Power control is therefore implemented on both ends of the link, where multiple sources and sinks may all operate at different power levels, and all individually adjust their respective power levels. | 11-01-2012 |
Patent application number | Description | Published |
20100173639 | PROVIDING SPACE DIVISION MULTIPLE ACCESS IN A WIRELESS NETWORK - To provide space division multiple access in a wireless network, plural beams are transmitted within a cell segment. Different information sets are sent in the corresponding plural beams, where one or more of the information sets are detectable by a mobile station depending upon a location of the mobile station in the cell segment. An indication responsive to which of the different information sets is detected by the mobile station is received, and beam selection from among the plural beams is performed according to the received indication. | 07-08-2010 |
20120026985 | Method and Apparatus for Grant Loss Detection and Related Processing in a Wireless Communication Network - The present invention provides a method and apparatus for improving wireless communication network performance and efficiency, based on detecting the occurrence of grant loss in relation to the transmission of scheduling grants to mobile terminals over a downlink control channel. Grant loss detection is based on detecting erasure events corresponding to the transmitted scheduling grants, and the incidence of grant loss with respect to a given mobile terminal can be tracked and used to compensate the control value(s) used for link adaptation of the downlink control channel, with respect to that terminal. Additionally, or alternatively, when a given grant is determined to be lost, a new grant is sent and the HARQ redundancy version is reset for the newly scheduled transmission. | 02-02-2012 |
20130190027 | METHOD AND MECHANISM FOR CONSERVING POWER CONSUMPTION OF SIGNLE-CARRIER WIRELESS TRANSMISSION SYSTEMS - A method and mechanism to reduce the energy consumption of a single-carrier wireless transmission system such as a base station or a subnet of multiple base stations in relation to the loading of the system. Energy savings may be achieved by withholding the transmission of the system over some time slots, decreasing the available frequencies for user traffic transmission, dynamically adjusting the system to a lower bandwidth, or a combination of these techniques in proportion to the system transmission load at a given time. The lower the system load, the more transmission resources may be withheld or reduced, and, hence, the more savings in energy consumption. Energy savings may be most prominent during periods of low traffic loading of the single carrier-based wireless transmission system. | 07-25-2013 |
20140044095 | INTER-RADIO ACCESS TECHNOLOGY INTERFERENCE COORDINATION FOR MULTI-STANDARD RADIO ACCESS NETWORKS - A method and system for coordinated interference suppression in a communication system. The communication system implements at least a first radio access technology via a first base station and a second radio access technology via a second base station. The first and second radio access technologies differ from one another. Information relating to an interference signal received at the first base station via the first radio access technology is received at the second base station from a first device associated with the first base station. At a second device associated with the second base station, an interfering user equipment accessing the second base station via the second radio access technology is identified. The identification is based on the information received from the first device associated with the first base station. Interference caused by the identified interfering user equipment is suppressed by the second base station. | 02-13-2014 |