Patent application number | Description | Published |
20080279317 | BICM DECODING IN THE PRESENCE OF CO-CHANNEL INTERFERENCE - Systems and methods are provided for computing soft information for digital information based on a received signal, where the received signal suffers from noise and interference. A receiver that decodes the received signal may estimate channel information, such as the channel gain, associated with the interfering source. The receiver may also obtain modulation information through a backbone network or by decoding control information transmitted by the interfering source. Using the modulation information and the channel information, the receiver may estimate the effect that interference has on the received signal, and may compute soft information (e.g., a log-likelihood ratio) for the digital information. | 11-13-2008 |
20090022093 | WIRELESS NETWORK WITH SIMULTANEOUS UPLINK TRANSMISSION OF INDEPENDENT DATA FROM MULTIPLE CLIENT STATIONS - A wireless network comprises R client stations that respectively generate simultaneous uplink transmission (SUT) data, where R is an integer greater than one. An access point (AP) receives SUT data from each of the R client stations during an SUT period. | 01-22-2009 |
20090022128 | ACCESS POINT WITH SIMULTANEOUS DOWNLINK TRANSMISSION OF INDEPENDENT DATA FOR MULTIPLE CLIENT STATIONS - A wireless network device comprises R modulation modules that receive R independent data streams, that modulate the R independent data streams, and that apply a multiplexing matrix to generate M modulated and multiplexed data streams, respectively, where R and M are integers greater than one. M summing modules sum portions of each of the M modulated and multiplexed data streams to generate M transmit data streams. M transmitters simultaneously transmit the M transmit data streams during a simultaneous downlink transmission (SDT) period. | 01-22-2009 |
20090047969 | PILOT DESIGN FOR UNIVERSAL FREQUENCY REUSE IN CELLULAR ORTHOGONAL FREQUENCY-DIVISION MULTIPLEXING SYSTEMS - Systems and methods are provided for transmitting information between an intended source and a receiver to minimize co-channel interference from at least one interfering source. Pilot subcarriers and data subcarriers may be broadcast from an intended source arid at least one interfering source. The pilot subcarriers may be shared across base stations or distributed among base stations in frequency, in time, or both. In addition, the frequency reuse factor of the pilot subcarriers may be different than the frequency reuse factor of the data subcarriers. A receiver receives a composite signal that corresponds with an intended signal from an intended source and an interfering signal from at least one interfering source. The portion of the received signal that corresponds to the intended signal may be recovered by the receiver based on the broadcast of the pilot subcarriers. | 02-19-2009 |
20090051592 | Pseudo-Omni-Directional Beamforming with Multiple Narrow-Band Beams - In a technique for communication with a station on a wireless network, the technique includes forming a plurality of narrow-band beams, each having a different angular direction from an antenna of a base station and collectively distributed over a beamspace to form a pseudo-omni-directional beam pattern. That beamspace may span an entire spherical region or a portion thereof, for example, when the narrow-band beams are broadcast over a sector of an entire spherical region. The technique may assign each of the plurality of narrow-band beams to a different frequency band (such as a different channel band or sub-channel) on the wireless network. The technique may simultaneously broadcast the plurality of narrow-band beams in a time-varying manner such that the angular direction of each of the plurality of narrow-band beams varies with time, where that variation may be random or ordered. | 02-26-2009 |
20090252104 | Physical Layer Frame Format Design for Wideband Wireless Communications Systems - Systems and methods are provided for processing a payload portion of a received signal in a single carrier mode or a multiple carrier mode using a wireless channel receiver based on a portion of the received signal, where a signaling portion of the received signal is a single carrier signal. A single carrier signaling portion is received, and whether the payload portion of the signal is a single carrier signal or a multiple carrier signal is detected from the received single carrier signaling portion. The payload portion of the received signal is demodulated in a single carrier mode if the detecting determines that the payload portion of the received signal is a single carrier signal, and the payload portion of the received signal is demodulated in a multiple carrier mode if the detecting determines that the payload portion of the received signal is a multiple carrier signal. Data from the demodulated payload portion of the received signal is stored in a computer-readable memory. | 10-08-2009 |
20090262855 | DATA SYMBOL MAPPING FOR MULTIPLE-INPUT MULTIPLE-OUTPUT HYBRID AUTOMATIC REPEAT REQUEST - A system includes an encoding module, a symbol selection module, a subcarrier selection module, and a mapping module. The encoding module receives symbols for transmission over K subcarriers and T antennas, encodes the symbols using a space time code, and generates space time coded (STC) versions of the symbols, where K and T are integers greater than 1. The symbol selection module selects T adjacent ones of the symbols and selects STC versions of the T adjacent ones of the symbols. The subcarrier selection module selects one of the K subcarriers for transmitting the T adjacent ones of the symbols and the STC versions of the T adjacent ones of the symbols. The mapping module maps the T adjacent ones of the symbols onto the T antennas for transmission over the selected one of the K subcarriers, respectively, and maps the STC versions of the T adjacent ones of the symbols onto the T antennas for transmission over the selected one of the K subcarriers. | 10-22-2009 |
20090279633 | SYMBOL VECTOR-LEVEL COMBINING TRANSMITTER FOR INCREMENTAL REDUNDANCY HARQ WITH MIMO - Techniques are provided for transmitting and receiving a mother code in an incremental redundancy hybrid automatic repeat-request protocol. A set of information bits corresponding to a message may be encoded and interleaved to produce the mother code. Each bit position of the mother code may be mapped to an output symbol, and each output symbol may be mapped to an antenna for transmission. One or more transmissions of symbols contained in the output symbols may be performed, where each transmission may include puncturing the mother code by selecting one or more symbols from the of output symbols, and transmitting each symbol in the one or more symbols on an antenna corresponding to that symbol. The mother code may be decoded, in part, by determining combinable bits contained within a set of received symbols, and computing one or more log-likelihood ratio values corresponding to each symbol in the set of received symbols. | 11-12-2009 |
20090282311 | SYMBOL VECTOR-LEVEL COMBINING RECEIVER FOR INCREMENTAL REDUNDANCY HARQ WITH MIMO - Techniques are provided for transmitting and receiving a mother code in an incremental redundancy hybrid automatic repeat-request protocol. A set of information bits corresponding to a message may be encoded and interleaved to produce the mother code. Each bit position of the mother code may be mapped to an output symbol, and each output symbol may be mapped to an antenna for transmission. One or more transmissions of symbols contained in the output symbols may be performed, where each transmission may include puncturing the mother code by selecting one or more symbols from the of output symbols, and transmitting each symbol in the one or more symbols on an antenna corresponding to that symbol. The mother code may be decoded, in part, by determining combinable bits contained within a set of received symbols, and computing one or more log-likelihood ratio values corresponding to each symbol in the set of received symbols. | 11-12-2009 |
20090285240 | Efficient Physical Layer Preamble Format - A method of generating a data unit preamble includes generating a first field associated with at least one of packet synchronization information or frame boundary indication, and generating a second field associated with channel estimation, including generating a first channel estimation sequence (CES) symbol and generating a second CES symbol, so that at least one of 1) a sequence in the first field serves as a cyclic prefix of the first CES symbol, 2) a beginning portion of the second CES symbol serves as a cyclic postfix of the first CES symbol, or 3) an ending portion of the first CES symbol serves as a cyclic prefix of the second CES symbol. | 11-19-2009 |
20090285241 | Efficient Physical Layer Preamble Format - A method for generating a preamble of a data unit includes generating a short training field (STF) of the preamble to include one of a repeating series of a sequences or a repeating series of b sequences, such that a and b are complementary sequences, a sum of out-of-phase aperiodic autocorrelation coefficients of a and b is zero, and where the STF is associated with at least synchronization information, and generating a long training field (LTF) of the preamble after the STF to include a′ sequences and b′ sequences, such that a′ is the sequence a cyclically shifted by zero or more positions, b′ is the sequence b cyclically shifted by zero or more positions, and where the LTF is associated with channel estimation information. | 11-19-2009 |
20090285319 | Efficient Physical Layer Preamble Format - A method for generating a preamble of a data unit for transmission via a communication channel includes generating a first field of the preamble using one of a first sequence or a second sequence, such that the first sequence and the second sequence are complementary sequences such that a sum of out-of-phase aperiodic autocorrelation coefficients of the first sequence and the second sequence is zero; generating, using the other one of the first sequence or the second sequence, an indicator of a start of a second field of the preamble, the second field associated with channel estimation information, such that the indicator of the start of the second field immediately follows the first field; and generating the second field of the preamble. | 11-19-2009 |
20090285339 | Apparatus for Generating Spreading Sequences and Determining Correlation - An apparatus includes a signal generator to output one of a first sequence or a second sequence and to augment sequences with cover codes, such that a sum of out-of-phase aperiodic autocorrelation coefficients of the first sequence and the second sequence of is zero, a physical layer preamble controller to control the signal generator to generate a preamble of a data unit, including a short training field (STF) formatter to cause the signal generator to generate an STF for use in at least frame synchronization, and a long training field (LTF) formatter to cause the signal generator to generate an LTF for use in at least channel estimation, such that the STF formatter controls the signal generator to include the first sequence in a last portion of the STF, and the LTF formatter controls the signal generator to include the second sequence in a beginning portion of the LTF. | 11-19-2009 |
20100008436 | Physical Layer Frame Format Design for Wideband Wireless Communications Systems - Systems and methods are provided for processing a payload portion of a received signal in a single carrier mode or a multiple carrier mode based on a portion of the received signal. A single carrier signaling portion is received at a first rate, and whether the payload portion of the signal is a single carrier signal or a multiple carrier signal is detected from the received single carrier signaling portion. The payload portion of the received signal is received at the first rate and demodulated in a single carrier mode if the detecting determines that the payload portion of the received signal is a single carrier signal, and the payload portion of the received signal is demodulated in a multiple carrier mode if the detecting determines that the payload portion of the received signal is a multiple carrier signal. | 01-14-2010 |
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 |
20100157955 | Efficient Formats of Beacon, Announcement, and Beamforming Training Frames - A method includes generating a first data unit to be transmitted during a first time period to one or several stations assumed to be beamformed, including determining a time interval that separates the first time period from a second time period, such that a second data unit is transmitted during the second time period to one or several stations assumed to be beamformed, and generating a parameter indicative of the time interval, such that the first data unit includes the parameter. | 06-24-2010 |
20100215027 | Techniques for Flexible and Efficient Beamforming - A method includes generating a first data unit to be transmitted during a first time period, including generating a field that specifies a first number of beamforming training data units that can be communicated during a first training session; processing a second data unit received during a second time period, including determining whether the first training session was accepted based on a first field of the second data unit, and determining a second number of beamforming training data units that can be communicated during a second training session based on a second field of the second data unit; and if the first training session was accepted, causing the specified first number of beamforming training data units to be communicated during the first training session. | 08-26-2010 |
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 |
20100248635 | Sounding And Steering Protocols For Wireless Communications - The present disclosure includes systems, apparatuses, and techniques relating to wireless local area network devices. Systems, apparatuses, and techniques include communicating with multiple wireless communication devices to determine characteristics of spatial wireless channels, determining steering matrices based on one or more outputs of the communicating, and transmitting signals that concurrently provide data to the wireless communication devices via different spatial wireless channels. The signals can be spatially steered to the wireless communication devices based on the steering matrices. | 09-30-2010 |
20100260159 | PHYSICAL LAYER FRAME FORMAT FOR WLAN - In a method for generating a data unit for transmission via a communication channel, wherein the data unit conforms to a first communication protocol, a preamble of the data unit is generated. The preamble includes a first field having information that indicates a duration of the data unit, the first field being formatted such that the first field is decodable by a receiver device that conforms to a second communication protocol but does not conform to the first communication protocol to determine the duration of the data unit based on the first field. Additionally, the preamble is formatted such that a portion of the preamble is decodable by a receiver device that conforms to a third communication protocol but does not conform to the first communication protocol. Also, the preamble is formatted such that a receiver device that conforms to the first communication protocol can determine that the data unit conforms to the first communication protocol. A data portion of the data unit that conforms to the first communication protocol and does not conform to either (i) the second communication protocol or (ii) the third communication protocol is generated. | 10-14-2010 |
20100322336 | Beamforming to a Subset of Receive Antennas in a Wireless MIMO Communication System - In a method for controlling transmission of an information signal to a multiplicity of receive antennas associated with one or more receivers a steering matrix is developed using a subset of receive antennas, wherein the subset of receive antennas includes less than all of the multiplicity of receive antennas. Transmission of the information signal via a plurality of transmit antennas is controlled using the steering matrix. | 12-23-2010 |
20110069688 | Short Packet for Use in Beamforming - A method for generating a beamforming training (BFT) unit includes generating a physical layer (PHY) preamble of the BFT unit and generating a first encoding block and a second encoding block using PHY data and MAC data, including at least one of i) using a number of padding bits in a PHY layer of the BFT unit such that the BFT unit consists of the PHY preamble, the first encoding block, and the second encoding block, and ii) generating a MAC protocol data unit (MPDU) having a length such that the BFT unit consists of the PHY preamble, the first encoding block, and the second encoding block. | 03-24-2011 |
20120140690 | Synchronized Interference Mitigation Scheme for Heterogeneous Wireless Networks - In a method of synchronizing time domain multiplexing interference mitigation schemes of at least a first, second, and third wireless communication link within a first, second, and third network, respectively, a first set of parameters defining a first set of time intervals is determined. The first set of time intervals is utilized to schedule transmissions of the first wireless communication link to reduce interference with transmissions of the second wireless communication link. A second set of parameters defining a second set of time intervals is determined. The second set of time intervals is utilized to schedule transmissions of the first wireless communication link to reduce interference with transmissions of the third wireless communication link. The second set of parameters is determined based at least in part on at least one of the first set of parameters. | 06-07-2012 |
20120148000 | BICM DECODING IN THE PRESENCE OF CO-CHANNEL INTERFERENCE - Systems and methods are provided for computing soft information for digital information based on a received signal, where the received signal suffers from noise and interference. A receiver that decodes the received signal may estimate channel information, such as the channel gain, associated with the interfering source. The receiver may also obtain modulation information through a backbone network or by decoding control information transmitted by the interfering source. Using the modulation information and the channel information, the receiver may estimate the effect that interference has on the received signal, and may compute soft information (e.g., a log-likelihood ratio) for the digital information. | 06-14-2012 |
20120177015 | Wireless Network With Simultaneous Uplink Transmission of Independent Data From Multiple Client Stations - A wireless network comprises R client stations that respectively generate simultaneous uplink transmission (SUT) data, where R is an integer greater than one. An access point (AP) receives SUT data from each of the R client stations during an SUT period. | 07-12-2012 |
20120182982 | ACCESS POINT WITH SIMULTANEOUS DOWNLINK TRANSMISSION OF INDEPENDENT DATA FOR MULTIPLE CLIENT STATIONS - A wireless network device includes modulation modules, each configured to receive a data stream and modulate the data stream to generate a modulated data stream. A matrix module generates a multiplexing matrix based on channel conditions between the wireless network device and each of a plurality of client stations, and applies the multiplexing matrix to each of the modulated data streams to generate multiplexed data streams. The wireless network device also includes summing modules, each configured to sum at least two of the multiplexed data streams to generate a transmit data stream. A first transmitter transmits a first one of the transmit data streams during a downlink transmission period to a first one of the client stations. A second transmitter transmits a second one of the transmit data streams to a second one of the client stations while the first transmitter transmits the first one of the transmit data streams. | 07-19-2012 |
20120201276 | PHYSICAL LAYER DATA UNIT FORMAT - In a wireless communication system in which 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, a method for generating a physical layer (PHY) data unit that conforms to a second format includes generating a first portion of the PHY data unit to indicate the PHY data unit conforms to the second format. The first portion of the PHY data unit includes an STF spread with a second spread code different than the first spread code. The method also includes generating a second portion of the PHY data unit according to the second format. The second portion of the PHY data unit includes PHY information elements not specified by the first format. | 08-09-2012 |
20120202548 | PSEUDO-OMNI-DIRECTIONAL BEAMFORMING WITH MULTIPLE NARROW-BAND BEAMS - In a technique for communication with a station on a wireless network, the technique includes forming a plurality of narrow-band beams, each having a different angular direction from an antenna of a base station and collectively distributed over a beamspace to form a pseudo-omni-directional beam pattern. That beamspace may span an entire spherical region or a portion thereof, for example, when the narrow-band beams are broadcast over a sector of an entire spherical region. The technique may assign each of the plurality of narrow-band beams to a different frequency band (such as a different channel band or sub-channel) on the wireless network. The technique may simultaneously broadcast the plurality of narrow-band beams in a time-varying manner such that the angular direction of each of the plurality of narrow-band beams varies with time, where that variation may be random or ordered. | 08-09-2012 |
20120207192 | PHYSICAL LAYER DATA UNIT FORMAT - In a wireless communication system wherein communication devices exchange information utilizing data units conforming to a first format, a method for generating a physical layer (PHY) data unit conforming to a second format and used to transmit PHY information includes generating a first sequence u of a channel estimation field (CEF) of the PHY data unit. The first sequence u of the CEF includes complementary Golay sequences a and b and is spread with a first cover code. The method also includes generating a second sequence v of the CEF. The second sequence v follows the first sequence u, includes the complementary Golay sequences a and b, and is spread with a second cover code different than the first cover code. The method also includes generating PHY information elements of the PHY data unit. The PHY information elements are not specified by the first format. | 08-16-2012 |
20120219017 | Efficient Physical Layer Preamble Format - A transmitter device includes a controller configured to generate a first field and a second field. The first field is at least one of a packet synchronization information field or a frame boundary indication field, the second field is a channel estimation field starting after the first field ends. The controller is configured to generate the second field at least in part by generating a first channel estimation sequence (CES) symbol and a second CES symbol. At least one of i) a sequence in the first field serves as a cyclic prefix of the first CES symbol, ii) a beginning portion of the second CES symbol serves as a cyclic postfix of the first CES symbol, or iii) an ending portion of the first CES symbol serves as a cyclic prefix of the second CES symbol. | 08-30-2012 |
20130039447 | SYMBOL VECTOR-LEVEL COMBINING RECEIVER FOR INCREMENTAL REDUNDANCY HARQ WITH MIMO - Techniques are provided for transmitting and receiving a mother code in an incremental redundancy hybrid automatic repeat-request protocol. Each bit position of the mother code may be mapped to an output symbol, and each output symbol may be mapped to an antenna for transmission. One or more transmissions of symbols contained in the output symbols may be performed, where each transmission may include puncturing the mother code by selecting one or more symbols from the of output symbols, and transmitting each symbol in the one or more symbols on an antenna corresponding to that symbol. The mother code may be decoded, in part, by determining combinable bits contained within a set of received symbols, and computing one or more log-likelihood ratio values corresponding to each symbol in the set of received symbols. | 02-14-2013 |
20130065533 | USING FREQUENCY BANDS CHARACTERIZED BY TYPE OF UNWANTED INTERFERENCE FOR COEXISTENCE AMONG MULTIPLE WIRELESS COMMUNICATION TECHNOLOGIES - Apparatus having corresponding methods and computer-readable media comprise: a first transceiver comprising a controller configured to select one of a plurality of frequency regions, and a transmitter configured to transmit, according to a first protocol, first wireless signals in the one of the plurality of the frequency regions selected by the controller, wherein each frequency region is characterized by a respective type of unwanted interference generated responsive to the transmitter transmitting the first wireless signals in the respective frequency region; an arbiter configured to select one or more frequency channels based on the one of the plurality of the frequency regions selected by the controller; and a second transceiver configured to transceive, according to a second protocol, second wireless signals only in the one or more frequency channels selected by the arbiter. | 03-14-2013 |
20130065638 | USING NON-UNIFORM FREQUENCY BANDS FOR COEXISTENCE AMONG MULTIPLE WIRELESS COMMUNICATION TECHNOLOGIES - Apparatus having corresponding methods and computer-readable media comprise: a first transceiver comprising a controller configured to select one of a plurality of frequency regions, wherein bandwidths of the frequency regions are non-uniform, and wherein the first transceiver is configured to transceive, according to a first protocol, first wireless signals in the one of the plurality of frequency regions selected by the controller; an arbiter configured to select one or more frequency channels based on the one of the plurality of the frequency regions selected by the controller; and a second transceiver configured to transceive, according to a second protocol, second wireless signals only in the one or more frequency channels selected by the arbiter. | 03-14-2013 |
20130101060 | SYSTEMS AND METHODS FOR SUPPRESSING INTERFERENCE IN A WIRELESS COMMUNICATION SYSTEM - Systems and methods are provided for suppressing interference from a received data signal. A characteristic of a channel is estimated, the channel being configured for transmission of data between a transmitting device and a receiving device having two or more receive antennas. A spatial correlation of interference is determined for the two or more receive antennas based on the channel characteristic. The received data signal is filtered based on the spatial correlation. | 04-25-2013 |
20130102256 | SYSTEMS AND METHODS FOR SUPPRESSING INTERFERENCE IN A SIGNAL RECEIVED BY A DEVICE HAVING TWO OR MORE ANTENNAS - Systems and methods for suppressing interference from a data signal received at a receiving device, where the receiving device has two or more receive antennas, are provided. Characteristics of a channel are estimated, the channel being a channel through which the data signal was transmitted by a transmitting device to the receiving device. A spatial correlation of interference and noise received at the two or more receive antennas of the receiving device is determined based on the estimated characteristics of the channel. The spatial correlation indicates how the interference and noise received at a particular one of the receive antennas is related to the interference and noise received at another one of the receive antennas. The spatial correlation of the interference and noise is used to suppress interference and noise from the data signal received at the receiving device. | 04-25-2013 |
20130114764 | Physical Layer Frame Format Design for Wideband Wireless Communications Systems - Systems and methods are provided for processing a payload portion of a received signal in a single carrier mode or a multiple carrier mode using a wireless channel receiver based on a portion of the received signal, where a signaling portion of the received signal is a single carrier signal. A single carrier signaling portion is received, and whether the payload portion of the signal is a single carrier signal or a multiple carrier signal is detected from the received single carrier signaling portion. The payload portion of the received signal is demodulated in a single carrier mode if the detecting determines that the payload portion of the received signal is a single carrier signal, and the payload portion of the received signal is demodulated in a multiple carrier mode if the detecting determines that the payload portion of the received signal is a multiple carrier signal. Data from the demodulated payload portion of the received signal is stored in a computer-readable memory. | 05-09-2013 |
20130115988 | METHODS AND APPARATUS FOR MITIGATING KNOWN INTERFERENCE - Systems and methods for mitigating known interference at a receiving device are provided. A signal from a transmission source is received by a receiving device that is affected by an interference source. At least one of a first pilot signal associated with the transmission source and a second pilot signal associated with the interfering source is determined. The first pilot signal includes information broadcast from the transmission source and the second pilot signal includes information broadcast from the interference source. Interference caused by the interference source is mitigated from the received signal using at least one of the first pilot signal and the second pilot signal. | 05-09-2013 |
20130163657 | OPTIMAL LINEAR EQUALIZER FOR MIMO SYSTEMS WITH HARQ AND/OR REPETITION CODING - Systems and methods are provided for decoding signal vectors in multiple-input multiple-output (MIMO) systems, where the receiver has received one or more signal vectors based on the same transmitted vector. The symbols of the received signal vectors are combined, forming a combined received signal vector that may be treated as a single received signal vector. The combined received signal vector may be equalized by, for example, a zero-forcing or minimum-mean-squared error equalizer or another suitable linear equalizer. Following equalization, the equalized signal vector may be decoded using a simple, linear decoder. | 06-27-2013 |
20130223365 | CROSS-LAYER SCHEDULING BASED ON LOWER LAYER FEEDBACK - Systems, methods, apparatus, and techniques are provided for retransmitting packets of data. A Radio Link Control (RLC) layer data packet is generated, and the RLC layer data packet is converted to one or more physical (PHY) layer data packets. The one or more PHY layer data packets are transmitted. At least one of a hybrid automatic transmission request (HARQ) acknowledgement (ACK) message and a HARQ negative acknowledgment (NACK) message is received from a receiver in response to transmission of the one or more PHY layer data packets. It is determined whether the at least one of the HARQ ACK message and the HARQ NACK message represents a automatic transmission request (ARQ) ACK message or a ARQ NACK message. | 08-29-2013 |
20130230126 | Physical Layer Frame Format Design For Wideband Wireless Communications Systems - Systems and methods are provided for processing a payload portion of a received signal in a single carrier mode or a multiple carrier mode based on a portion of the received signal. A single carrier signaling portion is received at a first rate, and whether the payload portion of the signal is a single carrier signal or a multiple carrier signal is detected from the received single carrier signaling portion. The payload portion of the received signal is received at the first rate and demodulated in a single carrier mode if the detecting determines that the payload portion of the received signal is a single carrier signal, and the payload portion of the received signal is demodulated in a multiple carrier mode if the detecting determines that the payload portion of the received signal is a multiple carrier signal. | 09-05-2013 |
20130235908 | APPARATUS FOR GENERATING SPREADING SEQUENCES AND DETERMINING CORRELATION - A circuit for use in a complementary Golay sequence generator or in a complementary Golay sequence correlator includes an input configured to receive an input signal, a set of delay elements, including delay elements corresponding to respective delays of 1, 2, 4, 8, 16, 32, and 64, and a set of multipliers interconnected with the input and the set of delay elements. The set of multipliers is configured to apply weight factors, and the weight factors define the sequence 1,1,−1,1,−1,1,−1. The circuit also includes a pair of outputs configured to output, in response to the input signal, one of (i) a pair of complementary Golay sequences or (ii) a pair of correlation output signals, using (a) the set of delay elements and (b) the set of weight multipliers. | 09-12-2013 |
20130242777 | CARRIER AGGREGATION SCHEDULING BASED ON TRAFFIC CHARACTERISTICS AND CELL CHARACTERISTICS - A method, implemented by one or more processors, for scheduling traffic streams in a communication network includes determining, via a processor, a plurality of sets of one or more cell characteristics. Each set of cell characteristics in the plurality of sets of cell characteristics corresponds to a different cell in a plurality of cells. The method also includes determining, via a processor, a first set of one or more traffic characteristics corresponding to a first traffic stream, selecting, via a processor, a first cell from the plurality of cells based on (i) the plurality of sets of cell characteristics and (ii) the first set of traffic characteristics, and assigning, via a processor, the first traffic stream to the first cell for an entire duration of the first traffic stream. | 09-19-2013 |
20130242968 | PHYSICAL LAYER DATA UNIT FORMAT - A beamforming training (BFT) data unit for transmission via a communication channel in a wireless personal area network is generated, and in particular, is for transmitting beamforming training information. A physical layer header and first BFT data are encoded using block encoding to generate a first block. Second BFT data are encoded using block encoding to generate a second block. The BFT data unit is generated with a fixed-length payload, such that the BFT data unit includes only i) a preamble, ii) the first block, and iii) the second block. | 09-19-2013 |
20130258936 | CELL DEPLOYMENT WITH DIFFERENT CHANNEL BANDWIDTH FOR CARRIER AGGREGATION - Systems, methods, apparatus, and techniques are provided for transmitting information to user equipment (UE) in a communications network. Data is generated in (i) a first frequency range associated with a first set of carriers and (ii) a second frequency range associated with a second set of carriers, where the first frequency range specifies a first communications cell and the second frequency range specifies a second communications cell. The first cell is assigned as a primary cell to a first set of UEs in the communications network. Control data is transmitted to both the first set of UEs and a second set of UEs using at least a portion of the first set of carriers. | 10-03-2013 |
20130266100 | Method And Apparatus For Jointly Performing Channel Estimation And Interference Estimation In A Wireless Communication System - Systems and methods for estimating characteristics of a channel are provided. A transmission of known reference data is received at a receiving device. The reference data is transmitted over the channel that includes one or more desired layers and one or more interfering layers. Characteristics of the channel are determined based on the known reference data, where the determining includes a joint estimation of the one or more desired layers and the one or more interfering layers. The determining includes selecting certain of the layers to be estimated at each of the known reference data and selecting certain of the layers to be estimated over a range of the known reference data. The determining includes solving an equation to jointly estimate the one or more desired layers and the one or more interfering layers based on the selections. The selections reduce a number of unknown values in the equation. | 10-10-2013 |
20130267234 | SYSTEM AND METHOD OF PERFORMING IDLE MODE SIGNALING REDUCTION IN MULTI-RADIO ACCESS TECHNOLOGY CELLULAR NETWORKS - A method includes performing a handover for a mobile device between first and second RAT networks. The first RAT network has a tracking area. The second RAT network has a routing area. Idle mode signaling reduction is activated in the mobile device including activating first and second timers respectively for the first and second RAT networks. In response to either one of the first and second timers expiring, a tracking or routing area update is sent to a first base station. The first base station is in the first RAT network or the second RAT network. The first timer is reset while the second timer maintains a set offset from the first timer. The tracking area update indicates that the mobile device has performed a handover to the first RAT network. The routing area update indicates that the mobile device has handed over to the second RAT network. | 10-10-2013 |
20130294309 | SCHEDULING SCHEMES FOR USER EQUIPMENT POWER SAVING IN A COMMUNICATION NETWORK - In a method of allocating wireless medium resources in a communication system, the communication system including a base station and a plurality of client stations sharing a channel bandwidth, a frequency sub-band of the channel bandwidth is selected for allocating wireless medium resources to a client station. Wireless medium resources are allocated at the base station to the client station. The base station is constrained to allocate wireless medium resources to the client station within the selected frequency sub-band. A subframe is generated for transmission to the client station. The subframe includes at least a data region that contains data for the client station. The data for the client station is confined to be within the selected frequency sub-band. | 11-07-2013 |
20130329718 | Techniques for Flexible and Efficient Beamforming - Training data for a first training session is generated to include a first data unit, the first data unit having a field that specifies a first number of beamforming training data units that can be communicated during a second training session to occur after the first training session. The training data including the first data unit is transmitted to a second device during the first training session. A second data unit received from the second device is processed to determine whether a request for the second device to participate in the second training session was accepted by the second device based on a first field of the second data unit. In response to determining that the request to participate in the second training session was accepted by the second device, the first number of beamforming training data units are transmitted during the second training session. | 12-12-2013 |
20140003384 | Sounding and Steering Protocols for Wireless Communications | 01-02-2014 |
20140045498 | USER MOBILITY CONTROL FOR HETEROGENEOUS WIRELESS NETWORKS - In a wireless network including a first cell and a second cell, it is determined whether a measure of mobility of a user device meets a mobility criterion, and it is determined whether a size of the second cell meets a cell size criterion. When it is determined that (i) the measure of mobility of the user device meets the mobility criterion and (ii) the size of the second cell meets the cell size criterion, the user device is prevented from being switched from the first cell to the second cell, or at least one of (i) a handover parameter or (ii) a cell reselection parameter is adjusted in order to change a probability that the user device will switch from the first cell to the second cell. | 02-13-2014 |
20140064098 | Method and Apparatus for Detecting and Processing a Retransmitted Data Packet in a Wireless Network - The present disclosure describes systems and techniques relating to wireless communications. According to an aspect of the described systems and techniques, an apparatus includes circuitry configured to receive a signal representing a wireless communication transmission; and circuitry configured to process the signal to (i) decode a control portion of the wireless communication transmission, (ii) determine from the decoded control portion that a data portion of the wireless communication transmission was successfully decoded previously and acknowledged, and so the wireless communication transmission is an unnecessary retransmission, and (iii) trigger acknowledgement of the wireless communication transmission being successfully decoded, without completing a decode of the data portion of the wireless communication transmission, when the unnecessary retransmission is detected. | 03-06-2014 |
20140071973 | METHOD AND APPARATUS FOR TRANSMITTING FIRST DATA STREAMS VIA RESPECTIVE TRANSMITTERS TO MULTIPLE CLIENTS STATIONS DURING A SAME PERIOD AND SUCCESSIVELY TRANSMITTING SECOND DATA STREAMS - An access point including a first transmitter and a second transmitter. The first transmitter is configured to (i) during a first window, transmit a first data stream to a first client station, and (ii) during a second window, transmit a second data stream to a second client station. The second transmitter is configured to: during the first window and while the first transmitter transmits the first data stream to the first client station, transmit a third data stream to a third client station; during a first portion of the second window and while the first transmitter is transmitting the second data stream to the second client station, refrain from transmitting a fourth data stream to a fourth client station; and subsequent to the first transmitter completing the transmission of the second data stream and during a second portion of the second window, transmit the fourth data stream to the fourth client station. | 03-13-2014 |
20140072080 | Physical Layer Frame Format Design for Wideband Wireless Communications Systems - Systems and methods are provided for processing a payload portion of a received signal in a single carrier mode or a multiple carrier mode based on a portion of the received signal. A single carrier signaling portion is received at a first rate, and whether the payload portion of the signal is a single carrier signal or a multiple carrier signal is detected from the received single carrier signaling portion. The payload portion of the received signal is received at the first rate and demodulated in a single carrier mode if the detecting determines that the payload portion of the received signal is a single carrier signal, and the payload portion of the received signal is demodulated in a multiple carrier mode if the detecting determines that the payload portion of the received signal is a multiple carrier signal. | 03-13-2014 |
20140078961 | METHOD AND SYSTEM FOR DETECTING SYNCHRONIZATION SIGNALS IN A MOBILE COMMUNICATIONS PROTOCOL - A method of detecting a secondary synchronization signal in a received signal having desired primary and secondary synchronization signals, and interfering primary and secondary synchronization signals, includes providing information regarding primary synchronization signal location and, based on the information regarding primary synchronization signal location, performing successive interference cancellation to remove the interfering secondary synchronization signals for detecting the desired secondary synchronization signal, without performing successive interference cancellation on the primary synchronization signals. Apparatus for detecting a secondary synchronization signal in a received signal having (i) desired primary and secondary synchronization signals and (ii) interfering primary and secondary synchronization signals includes a source of information regarding primary synchronization signal location, and successive interference cancellation circuitry. The successive interference cancellation circuitry uses the information regarding primary synchronization signal location to remove interfering secondary synchronization signals for detecting the desired secondary synchronization signal, without performing successive interference cancellation on the primary synchronization signals. | 03-20-2014 |
20140105337 | BICM DECODING IN THE PRESENCE OF CO-CHANNEL INTERFERENCE - Systems and methods are provided for computing soft information for digital information based on a received signal, where the received signal suffers from noise and interference. A receiver that decodes the received signal may estimate channel information, such as the channel gain, associated with the interfering source. The receiver may also obtain modulation information through a backbone network or by decoding control information transmitted by the interfering source. Using the modulation information and the channel information, the receiver may estimate the effect that interference has on the received signal, and may compute soft information (e.g., a log-likelihood ratio) for the digital information. | 04-17-2014 |
20140134956 | Pseudo-Omni-Directional Beamforming with Multiple Narrow-Band Beams - In a technique for communication with a station on a wireless network, the technique includes forming a plurality of narrow-band beams, each having a different angular direction from an antenna of a base station and collectively distributed over a beamspace to form a pseudo-omni-directional beam pattern. That beamspace may span an entire spherical region or a portion thereof, for example, when the narrow-band beams are broadcast over a sector of an entire spherical region. The technique may assign each of the plurality of narrow-band beams to a different frequency band (such as a different channel band or sub-channel) on the wireless network. The technique may simultaneously broadcast the plurality of narrow-band beams in a time-varying manner such that the angular direction of each of the plurality of narrow-band beams varies with time, where that variation may be random or ordered. | 05-15-2014 |
20140153659 | PILOT DESIGN FOR UNIVERSAL FREQUENCY REUSE IN CELLULAR ORTHOGONAL FREQUENCY-DIVISION MULTIPLEXING SYSTEMS - Systems and methods are provided for transmitting information between an intended source and a receiver to minimize co-channel interference from at least one interfering source. Pilot subcarriers and data subcarriers may be broadcast from an intended source and at least one interfering source. The pilot subcarriers may be shared across base stations or distributed among base stations in frequency, in time, or both. In addition, the frequency reuse factor of the pilot subcarriers may be different than the frequency reuse factor of the data subcarriers A receiver receives a composite signal that corresponds with an intended signal from an intended source and an interfering signal from at least one interfering source. The portion of the received signal that corresponds to the intended signal may be recovered by the receiver based on the broadcast of the pilot subcarriers. | 06-05-2014 |
20140206304 | BEAMFORMING BY SECTOR SWEEPING - A first plurality of training data units are transmitted via a plurality of antennas of a first station as part of a first transmit beamforming training procedure. Subsequently, a second plurality of training data units are received via the plurality of antennas as part of second transmit beamforming procedure while the first station applies a single receive antenna configuration. The second plurality of training data units includes an information element that specifies a feedback from a second station, the feedback including an identifier corresponding to one of the training data units in the first plurality of data units. The first station transmits a feedback message to the second station, that includes (i) one or more indicators of one or more training data units selected from the second plurality of training data units, and (ii) a request to perform a subsequent beamforming training procedure. | 07-24-2014 |
20140211766 | IN-DEVICE COEXISTENCE OF MULTIPLE WIRELESS COMMUNICATION TECHNOLOGIES - In a method of operating a device configured to communicate according to at least a first communication protocol and a second communication protocol, a time division multiplexing (TDM) pattern is obtained. The TDM pattern is defined for communication according to the first communication protocol is obtained. The TDM pattern defines communication periodicity that includes a scheduled period and an unscheduled period. A guard interval is reserved within the unscheduled period, and the unscheduled period is used for communication according to the second communication protocol. The guard interval is used to transition to an inactive state with respect to the second communication protocol. | 07-31-2014 |
20140233625 | MAXIMAL RATIO COMBINING OF EQUALIZED SYMBOLS FOR MIMO SYSTEMS WITH HARQ AND/OR REPETITION CODING - Systems and methods are provided for decoding signal vectors in multiple-input multiple-output (MIMO) systems, where the receiver has received one or more signal vectors based on the same transmitted vector. The receiver linearizes each received signal vector using one or more zero-forcing, MMSE, or other suitable linear equalizers. The components of the equalized signal vectors may be combined using maximum-ratio combining to form the components of a combined equalized signal vector. The components of the combined equalized signal vector may then be decoded individually using a linear decoder. | 08-21-2014 |
20140254719 | SYMBOL VECTOR-LEVEL COMBINING TRANSMITTER FOR INCREMENTAL REDUNDANCY HARQ WITH MIMO - Techniques are provided for transmitting and receiving a mother code in an incremental redundancy hybrid automatic repeat-request protocol. A set of information bits corresponding to a message may be encoded and interleaved to produce the mother code. Each bit position of the mother code may be mapped to an output symbol, and each output symbol may be mapped to an antenna for transmission. One or more transmissions of symbols contained in the output symbols may be performed, where each transmission may include puncturing the mother code by selecting one or more symbols from the of output symbols, and transmitting each symbol in the one or more symbols on an antenna corresponding to that symbol. The mother code may be decoded, in part, by determining combinable bits contained within a set of received symbols, and computing one or more log-likelihood ratio values corresponding to each symbol in the set of received symbols. | 09-11-2014 |
20140273869 | SYSTEMS AND METHODS FOR LTE INTERFERENCE DETECTION - Systems and methods are provided for identifying whether a signal is an LTE signal. The method includes receiving, using control circuitry, a signal. The method includes computing a measurement of the received signal, determining a signal parameter corresponding to a system parameter specific to an LTE standard, and identifying whether the received signal is an LTE signal based on the determined signal parameter. | 09-18-2014 |
20140274202 | IN-DEVICE COEXISTENCE OF WIRELESS COMMUNICATION TECHNOLOGIES - In a method of operating a communication device that includes at least (i) a first network interface configured to operate according to a first communication protocol and (ii) a second network interface configured to operate according to a second communication protocol, the first communication interface is operated according to the first communication protocol. The first communication protocol defines a periodically repeating set of time intervals. One or more time intervals, from the set of time intervals, that meet a selection criteria are determined. The selection criteria is based on level of interference experienced by the first network interface. During the determined one or more time intervals, operation of the first network interface according to the first communication protocol is suspended, and operation of the second network interface according to the second communication protocol is enabled. | 09-18-2014 |
20140293912 | TERMINATION OF WIRELESS COMMUNICATION UPLINK PERIODS TO FACILITATE RECEPTION OF OTHER WIRELESS COMMUNICATIONS - The present disclosure describes systems and techniques relating to wireless communications by devices that employ more than one wireless communication technology. According to an aspect of the described systems and techniques, a device includes: a first radio configured to communicate wirelessly with a first station in accordance with a first wireless communication technology, a second radio configured to communicate wirelessly with a second station in accordance with a second wireless communication technology, a controller configured to (i) terminate scheduled portions of time for sending communications from the first radio to the first station in favor of receiving communications from the second station to the second radio and (ii) restrict which of all available scheduled portions of time for sending communications from the first radio to the first station are provided for termination based on information about types of data transmitted in respective ones of the available scheduled portions of time. | 10-02-2014 |
20140301509 | SYSTEMS AND METHODS FOR CHANNEL QUALITY INDICATOR (CQI) SELECTION FOR NON-DETERMINISTIC RECEIVERS - Systems and methods are provided for determining a channel quality indicator (CQI) for receivers that exhibit non-deterministic behavior during the CQI selection process. A codeword is received over a transmission system at a receiver, and a performance measure that is dependent on the CQI is determined for the codeword. The receiver determines an objective function that is based on the CQI and the performance measure, and selects a value for the CQI by performing an optimization technique on the objective function. The optimization technique is performed on the objective function over a range of candidate CQI values, and the selected value for the CQI is the candidate CQI value that optimizes the objective function. | 10-09-2014 |
20140321479 | 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, a physical layer (PHY) data unit that conforms to a second format and is for transmitting PHY control information is generated. Generating the PHY data unit includes generating a first portion of the PHY data unit 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 a second spread code different than the first spread 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 omits header fields specified by the first format. | 10-30-2014 |
20140327559 | SYSTEMS AND METHODS FOR ORDERING CODEWORDS BASED ON POSTERIOR INFORMATION IN SUCCESSIVE INTERFERENCE CANCELLATION (SIC) RECEIVERS - Systems and methods are provided for determining a decoding order in a successive interference cancellation receiver. The method includes receiving, using control circuitry, a plurality of codewords. The method further includes computing at least one ordering metric for at least one of the plurality of codewords based on posterior information associated with the plurality of codewords, and determining the decoding order based on the at least one ordering metric. | 11-06-2014 |
20140369278 | METHOD AND APPARATUS FOR MITIGATING THE EFFECT OF CERTAIN TYPES OF INTERFERENCE ON A SIGNAL RECEIVED IN A WIRELESS NETWORK - A system including an interference module. The interference module is configured to determine, based on first data to be transmitted from a wireless communication device, information about interference predicted to be caused by the first data being transmitted, and provide, to a receiver of the wireless communication device, the information about the predicted interference. A component of the receiver of the wireless communication device is configured to receive, from the interference module, the information about the predicted interference, and adjust, for a duration of the predicted interference, a function performed by the component of the receiver. The function performed by the component of the receiver is related to processing a signal received by the receiver of the wireless communication device. | 12-18-2014 |
20140376653 | METHODS AND SYSTEMS FOR DETERMINING INDICATORS USED IN CHANNEL STATE INFORMATION (CSI) FEEDBACK IN WIRELESS SYSTEMS - Systems and methods are provided for determining channel state information (CSI) at a receiver for feedback to a transmitter to indicate properties of the communication channel. A signal is received at a receiver over a communication channel. An optimization value is determined based on the received signal and a plurality of matrix indicators. An amount of change in wideband properties of the communication channel is determined from the optimization value. Based on the determined amount of change, a CSI including a selected type indicator and a selected subset of the plurality of the matrix indicators is selected. | 12-25-2014 |
20150049744 | EFFICIENT FORMATS OF BEACON, ANNOUNCEMENT, AND BEAMFORMING TRAINING FRAMES - A method includes generating a first data unit to be transmitted during a first time period to one or several stations assumed to be beamformed, including determining a time interval that separates the first time period from a second time period, such that a second data unit is transmitted during the second time period to one or several stations assumed to be beamformed, and generating a parameter indicative of the time interval, such that the first data unit includes the parameter. | 02-19-2015 |
20150078353 | ACCESS POINT COORDINATION FOR TRAFFIC CONTROL IN WIRELESS NETWORKS - A presence of interference between a first wireless network and a second wireless network is determined. Transmissions in the first wireless network are coordinated with transmissions in the second wireless network to reduce interference between the first wireless network and the second wireless network. Transmissions in the first wireless network are scheduled based on the coordinating to reduce interference between the first wireless network and the second wireless network. | 03-19-2015 |