Patent application number | Description | Published |
20080253337 | METHOD AND SYSTEM FOR SFBC/STBC TRANSMISSION OF ORTHOGONALLY CODED SIGNALS WITH ANGLE FEEDBACK IN A DIVERSITY TRANSMISSION SYSTEM - Aspects of a method and system for SFBC/STBC transmission of orthogonally coded signals with angle feedback in a diversity transmission system are presented. Exemplary aspects of the system may include one or more circuits that enables generation of a plurality of concurrently transmitted signal groups based on a computed matrix such that a product of the plurality of concurrently transmitted signal groups, the computed matrix and/or a transformed version of the computed matrix, may generate at least one set of orthogonal signals based on at least one rotation angle. | 10-16-2008 |
20080253478 | METHOD AND SYSTEM FOR RECONFIGURABLE SFBC/STBC IN A DIVERSITY TRANSMISSION SYSTEM - Aspects of a method and system for reconfigurable SFBC/STBC in a diversity transmission system are presented. Exemplary aspects of the system may include one or more circuits that enable generation of a plurality of codeword sequences based on a data sequence. In a diversity transmission system, the plurality of codeword sequences may be concurrently transmitted via at least a portion of a plurality of transmitting antennas. The concurrently transmitted codeword sequences may enable a diversity receiver to generate the data sequence. In a single input single output transmission system, one or more circuits may enable transmission of one of the plurality of codeword sequences via one of the plurality of transmitting antennas. The transmitted codeword sequence may enable a receiver to generate the data sequence. | 10-16-2008 |
20080310541 | METHOD AND SYSTEM FOR SFBC/STBC IN A DIVERSITY TRANSMISSION SYSTEM USING ALAMOUTI CODES - Aspects of a system for SFBC and/or STBC in a diversity transmission system using a plurality of Alamouti codes may include a transmitting station that enables reception of signals via a wireless communication medium. The transmitting station may enable determination of a plurality of channel estimate values that are based on signal propagation characteristics of the wireless communication medium. A plurality of N weighting factor phase angles may be computed based on the plurality of channel estimate values, where N is an integer that is greater than 1. The transmitting station may enable transmission of a plurality of 2·N signals based on the plurality of N weighting factors. The plurality of 2·N signals may be encoded utilizing Alamouti coding. | 12-18-2008 |
20080311873 | METHOD AND SYSTEM FOR SFBC/STBC IN A COMMUNICATION DIVERSITY SYSTEM USING ANGLE FEEDBACK - Aspects of a system for STBC/SFBC in a communication system using angle feedback may include a receiver, which enables reception of signals via a plurality of receiving antennas. The receiver may enable computation of a rotation factor value based on the received signals and utilization of the computed rotation factor value to receive subsequent signals via the plurality of receiving antennas. The received signals may comprise preamble data. The receiver may enable computation of channel estimate values based on the received preamble data. A rotation angle value may be computed based on the computed channel estimate values. The rotation factor value may be computed based on the computed rotation angle value. The receiver may enable transmission of feedback information comprising the computed rotation factor and/or the computed rotation angle. | 12-18-2008 |
20080317173 | METHOD AND SYSTEM FOR RATE>1 SFBC/STBC USING HYBRID MAXIMUM LIKELIHOOD (ML)/MINIMUM MEAN SQUARED ERROR (MMSE) ESTIMATION - Aspects of a method and system for rate>1 SFBC and/or STBC using hybrid maximum likelihood (ML)/minimum mean squared error (MMSE) estimation are presented. Aspects of an exemplary system may enable rate 5/4 coding in diversity communication systems that utilize SFBC and/or STBC. A transmitting station may utilize SFBC or STBC to generate and/or concurrently transmit a plurality of signals symbols, which are encoded to enable rate 5/4 transmission. A receiving station may decode rate 5/4 encoded signals utilizing a hybrid decoding method. The hybrid decoding method may result from application of a plurality of decoding methods when decoding the rate 5/4 encoded signals. In an exemplary aspect of the invention, the hybrid method may utilize ML/MMSE estimation in combination with zero forcing (ZF) interference cancellation. The combination may be referred to as hybrid ML/MMSE estimation. | 12-25-2008 |
20080317178 | METHOD AND SYSTEM FOR SFBC/STBC USING INTERFERENCE CANCELLATION - Aspects of a method and system for SFBC and/or STBC using interference cancellation are presented. Aspects of an exemplary system may enable rate | 12-25-2008 |
20090003475 | METHOD AND SYSTEM FOR ADAPTATION BETWEEN DIFFERENT CLOSED-LOOP, OPEN-LOOP AND HYBRID TECHNIQUES FOR MULTIPLE ANTENNA SYSTEMS - Aspects of a method and system for adaptation between different closed loop, open loop and hybrid techniques for multiple antenna systems may include a transmitting station that enables generation of a plurality of signals that are concurrently transmitted via a communication medium based on a selected one of: full feedback information, reduced quantity feedback information, or no feedback information. The selection may be determined at the transmitting station based on a determined Doppler shift frequency. | 01-01-2009 |
20090066577 | Method and System for Beamforming in a Multiple User Multiple Input Multiple Output (MIMO) Communication System Using a Codebook - A method and system for beamforming in a multiple user multiple input multiple output (MIMO) communication system using a codebook may include a processor in a node B that enables generation of an interference cancellation matrix (W | 03-12-2009 |
20090161641 | Method and System for Rate Selection Algorithm to Maximize Throughput in Close Loop Multiple Input Multiple Output (MIMO) Wireless Local Area Network (WLAN) System - Aspects of a method and system for rate selection algorithm to maximize throughput in closed loop multiple input multiple output (MIMO) wireless local area network (WLAN) system are provided and may comprise computing a maximum number of binary bits to be, simultaneously transmitted via an RF channel based on signal quality. A modulation technique may be selected based on the computed maximum, communicating feedback information comprising the selected modulation technique. Subsequently transmitted data may be received via an RF channel which is modulated based on the feedback information. Another aspect of the method may comprise receiving feedback information comprising at least one of a selected modulation technique and coding rate via an RF channel, and transmitting subsequent data via said at least one of a plurality of RF channels which either modulated, or coded, based on the feedback information. | 06-25-2009 |
20090161739 | RF TRANSCEIVER HAVING ADAPTIVE MODULATION - A modulation control module for use in an RF transceiver, the modulation control module includes a processing module and memory. The memory is operably coupled to the processing module, wherein the memory stores operational instructions that causes the processing module to: receive a multiple path channel estimation; and determining, for each transmit path of a multiple input multiple output (MIMO) wireless communication, a modulation control signal based on a corresponding portion of the multiple path channel estimation. | 06-25-2009 |
20090268842 | MULTIPLE STREAMS USING PARTIAL STBC WITH SDM WITHIN A WIRELESS LOCAL AREA NETWORK - A method of communicating data to M receiving antennas from N transmitting antennas, where M and N are integers, the method includes the steps of receiving M data signals from M receive antennas, applying the M data signals to a space/time decoder to produce M decoded streams and reconstructing original data transmitted via N transmit antennas from the M decoded streams. At least P transmitting antennas transmit space-time block-coded signals and (N-P) transmitting antennas transmit code signals through spatial division multiplexing, where P is an integer. | 10-29-2009 |
20090282315 | LDPC coding systems for 60 GHz millimeter wave based physical layer extension - LDPC coding systems for 60 GHz millimeter wave based physical layer extension. LDPC (Low Density Parity Check) encoding in cooperation with sub-carrier interleaving, in the context of orthogonal frequency division multiplexing (OFDM), and appropriate symbol mapping is performed in accordance with transmit processing as may be performed within a communication device. In a receiving communication device, receive processing may be performed on a received signal based on the type of LDPC, sub-carrier interleaving, and symbol mapping thereof. The LDPC code employed in accordance with such LDPC encoding may have a partial-tree like structure. In addition, appropriate manipulation of the bits assigned to respective sub-carriers may be performed to ensure that the bits emplaced in the MSB (Most Significant Bit) location of various symbols has some desired diversity (e.g., from different codewords, from appropriately different locations within a given codeword, etc.). | 11-12-2009 |
20090285172 | ASSIGNMENT OF HOLDING PACKETS IN A WIRELESS COMMUNICATION NETWORK - A method and apparatus for assigning holding packets in a wireless communication system or network includes determining an invalid station address that corresponds to an invalid station and that does not correspond to the address of an affiliated station. The invalid station address is assigned to a holding packet. The holding packet is transmitted to allocate a transmit period to the invalid station. This generates a quiet time in the wireless communication system or network during the transmit period. | 11-19-2009 |
20100008411 | Method and System for Frame Formats for MIMO Channel Measurement Exchange - A method and system for frame formats for MIMO channel measurement exchange is provided. Aspects of a method for communicating information in a communication system may comprise transmitting data via a plurality of radio frequency (RF) channels utilizing a plurality of transmitting antenna, receiving feedback information via at least one of a plurality of RF channels, and modifying a transmission mode based on the feedback information. Aspects of a method for communicating information in a communication system may also comprise receiving data via a plurality of receiving antenna, transmitting feedback information via at least one of the plurality of RF channels, and requesting modification of a transmission mode for the received data in transmitted response messages comprising the feedback information. | 01-14-2010 |
20100119017 | METHOD AND SYSTEM FOR A 4X2 SFBC/STBC SYSTEM WITH 2 SPATIAL STREAMS USING ANGLE FEEDBACK - Aspects of a method and system for a 4×2 SFBC/STBC system with 2 spatial streams using angle feedback are presented. Aspects of the system include a 4×2 SFBC/STBC communication diversity system with 2 distinct spatial streams using angle feedback. A receiving station may concurrently receive signals. A channel estimate matrix may be computed based on the received signals. A rotation angle value may be computed based on the channel estimate matrix. The receiving station may transmit the computed rotation angle via feedback information to a transmitting station. The transmitting station may utilize the received feedback information to generate a plurality of 4 distinct transmit chain signals based on data symbols received via a plurality of 2 spatial streams. Each of the distinct transmit chain signals may comprise a plurality of codewords. The transmitting station may concurrently transmit the plurality of transmit chain signals via the plurality of transmitting antennas. | 05-13-2010 |
20100144280 | METHOD AND SYSTEM FOR BITS AND CODING ASSIGNMENT UTILIZING EIGEN BEAMFORMING WITH FIXED RATES FOR CLOSED LOOP WLAN - A method and system for bits and coding assignment utilizing Eigen beamforming with fixed rates for a closed loop WLAN is provided. Aspects of the method for communicating information in a communication system may comprise transmitting data via a plurality of radio frequency (RF) channels utilizing a plurality of transmitting antennas and receiving feedback information related to the plurality of RF channels. Bits may be assigned for transmission via at least one of the plurality of RF channels based on the feedback information. At least a portion of subsequent data having at least a first coding rate based on the assignment of bits may be transmitted via at least one of the plurality of RF channels. The method may also comprise receiving data via a plurality of RF channels utilizing a plurality of receiving antennas, and transmitting feedback information related to the plurality of RF channels. | 06-10-2010 |
20100150260 | METHOD AND SYSTEM FOR MINIMIZING EFFECTS OF TRANSMITTER IMPAIRMENTS IN MULTIPLE INPUT MULTIPLE OUTPUT (MIMO) BEAMFORMING COMMUNICATION SYSTEMS - Aspects of a method and system for minimizing effects of transmitter impairments in multiple input multiple output (MIMO) beamforming communication systems are presented. In one aspect of a system for minimizing effects of transmitter impairments, a MIMO transmitter may enable nulling of transmitter-induced noise by adjusting at least a portion of a plurality of signals transmitted based on a transmitter error vector magnitude (EVM). The transmitter may enable transmission of the plurality of signals subsequent to the nulling. In another aspect of a system for minimizing effects of transmitter impairments a MIMO receiver may enable nulling of transmitter-induced noise contained in a plurality of received signals based on a transmitter EVM. Each of the plurality of received signals may include information contained in a plurality of spatial streams. The receiver may enable detecting estimated values for the information contained in the plurality of spatial streams based on the nulling. | 06-17-2010 |
20100165967 | WIRELESS LOCAL AREA NETWORK SYSTEM USING SPACE-TIME BLOCK CODING (STBC) HAVING BACKWARD COMPATIBILITY WITH PRIOR STANDARDS - A method of communicating data to a receiving antenna from N transmitting antennas, where N is an integer, includes the steps of determining whether a legacy transmission mode has been selected, producing N data streams from outbound data, and applying the N data streams to a space/time encoder to produce N encoded signals. When the legacy transmission mode has not been selected, the N encoded signals are transmitting from N transmitting antennas and when the legacy transmission mode has been selected, the one encoded signal is transmitted from one of the N transmitting antennas. The legacy transmission mode allows receivers to receive and process transmitted signals when the receivers are only configured to receive the transmitted signals from a single transmitting antenna. | 07-01-2010 |
20100208715 | Classifier for communication device - Classifier for communication device. A communication device includes a classifier and a number of PHY (physical layer) receivers communicatively coupled thereto that enable the communication device to process various received signal types. Each of the PHY receivers is operable to perform pre-processing of a received frame (or packet) of data and to calculate a confidence level indicating whether the received frame is intended for that particular PHY receiver; this pre-processing does not involve processing (e.g., demodulation and/or decoding) of the received frame. Those PHY receivers having sufficiently high confidence levels assert claims to the classifier for the received frame. The classifier is operable to arbitrate between competing claims by 2 or more PHY receivers and to ensure that the received frame is provided to the PHY receiver for which it is intended. | 08-19-2010 |
20100246541 | METHOD AND SYSTEM FOR ADAPTIVE MODULATIONS AND SIGNAL FIELD FOR CLOSED LOOP MULTIPLE INPUT MULTIPLE OUTPUT (MIMO) WIRELESS LOCAL AREA NETWORK (WLAN) SYSTEM - Aspects of a method and system for an optional closed loop mechanism with adaptive modulations for a multiple input multiple output (MIMO) WLAN system are provided. One aspect of the system may utilize properties of Eigenvalue analysis of MIMO systems to reduce the number of bits of binary information required to select a modulation type among a plurality of modulation types for each spatial stream among a plurality of spatial streams. This provides a reduction in the required number of bits when compared to other approaches and accordingly, enable greater flexibility in systems that utilize closed loop feedback mechanisms. | 09-30-2010 |
20100309779 | Carrier sense multiple access (CSMA) for multiple user, multiple access, and/or MIMO wireless communications - Carrier sense multiple access (CSMA) for multiple user, multiple access, and/or MIMO wireless communications. In wireless communication systems that operate in supporting communications via one or more clusters, appropriate determination of when to begin making such transmissions on one or more clusters is made in accordance with intelligent carrier sense multiple access (CSMA) that may be performed in a number of different ways. In accordance with this, a cluster may be any combination composed of one or more channels among one or more bands. In supporting multi-cluster access, CSMA may be performed in selecting a primary cluster and performing backoff (e.g., countdown) thereon. After backoff is finished for the primary cluster, and the availability of one or more others clusters is checked, transmissions may be made using the available clusters. Alternatively, backoff may be made for each or multiple (a subset of) clusters or even individually for each respective cluster. | 12-09-2010 |
20100309834 | CHANNEL CHARACTERIZATION AND TRAINING WITHIN MULTIPLE USER, MULTIPLE ACCESS, AND/OR MIMO WIRELESS COMMUNICATIONS - Channel characterization and training within multiple user, multiple access, and/or MIMO wireless communications. Within such communication systems, there can be a number of devices (e.g., STAs) that communicate with a single device (e.g., AP). A multi-cast sounding frame may be transmitted from a transmitting device to a number of receiving devices. Appropriate scheduling or ordering of feedback signals from some or all of the receiving devices may be performed explicitly (e.g., sounding frame sent from the transmitting device to a receiving device) or implicitly (e.g., control information sent from the transmitting device to the receiving device, sounding frame sent to the transmitting device from the receiving device). Such characterization and training is with respect to a channel or path in which data will subsequently follow. Such characterization and training can be performed in accordance with group membership (e.g., with respect to only some of the receiving devices). | 12-09-2010 |
20100309848 | TRANSMISSION COORDINATION WITHIN MULTIPLE USER, MULTIPLE ACCESS, AND/OR MIMO WIRELESS COMMUNICATIONS - Transmission coordination within multiple user, multiple access, and/or MIMO wireless communications. Within wireless communication systems, there can be various wireless communication devices therein that are not all compliant with a common capability set, communication protocol, communication standard, recommended practice, etc. For example, some communication systems may have some wireless communication devices characterized as ‘legacy’ wireless communication devices, and other wireless communication devices therein may be newer and compliant with newer capability sets, communication protocols, communication standards, recommended practices, etc. In such instances, coordination of transmissions among the various wireless communication devices may be made, when performing simultaneous transmissions, by ensuring that transmissions of devices on different channels is made when aligned on a common boundary of an OFDM symbol. Alternatively, such simultaneous transmissions may be made when offset by some multiple of OFDM symbol duration. When performing non-simultaneous transmissions, transmissions may be made based on channel availability. | 12-09-2010 |
20100309871 | Scheduled Clear To Send (CTS) for Multiple User, Multiple Access, and/or MIMO Wireless Communications - Scheduled clear to send (CTS) for multiple user, multiple access, and/or MIMO wireless communications. Before sending transmissions, a request to send (RTS)/clear to send (CTS) exchange takes place between a transmitting wireless communication device and multiple receiving wireless communication devices may take place therein. The transmitting wireless communication device (e.g., an AP) may generate and transmit a multi-user request to send (mRTS) frame to a number of receiving wireless communication devices (e.g., STAs). The mRTS frame can include information and instructions therein to direct the manner by which all or a subset of the receiving wireless communication devices are to provide CTS responses back to the transmitting wireless communication device. The mRTS frame may be an OFDMA frame, a MU-MIMO frame, or a combination thereof. The CTS responses may be received in accordance with any one or combination of OFDM signaling, OFDMA signaling, and MU-MIMO signaling. | 12-09-2010 |
20100309872 | Medium accessing mechanisms within multiple user, multiple access, and/or MIMO wireless communications - Medium accessing mechanisms within multiple user, multiple access, and/or MIMO wireless communications. A multi-user super-frame (MU-SF), as controlled by a MU-SF owner, is used to govern the manner by which various wireless communication devices have access to the communication medium. When various wireless communication devices operate within a wireless communication system, communication medium access can be handled differently for wireless communication devices having different capabilities. Per the MU-SF, those having a first capability may get medium access in accordance with a first operational mode (e.g., carrier sense multiple access/collision avoidance (CSMA/CA)), while those having a second capability may get medium access in accordance with a second operational mode (e.g., scheduled access). The respective durations for each of the first operational mode and the second operational mode within various MU-SFs need not be the same; the respective durations thereof may be adaptively modified based on any number considerations. | 12-09-2010 |
20100310002 | ADAPTIVE AND SELECTIVE FRAME FORMATS WITHIN MULTIPLE USER, MULTIPLE ACCESS, AND/OR MIMO WIRELESS COMMUNICATIONS - Adaptive and selective frame formats within multiple user, multiple access, and/or multiple input multiple output (MIMO) wireless communications. A reconfigurable channel circuitry, that may be implemented to communicate with one, a subset, or all of various blocks within a communication device provides for adaptive and selective frame formatting of communications between the communication device and other communication devices. In a wireless communication device context, and also in the context of multiple user, multiple access, and/or MIMO communications (e.g., multi-user multiple input multiple output (MU-MIMO) and/or orthogonal frequency division multiplexing (OFDM), etc.), frame formatting may be adapted in accordance with a number of parameters including: the one or more users with which communications are to be made, the clusters (e.g., channel, band, frequency, etc.) employed for such communications, the one or more antennae (e.g., within a multi-antenna architecture) employed for such communications, and/or any other parameters. | 12-09-2010 |
20100310003 | TRANSMISSION ACKNOWLEDGMENT WITHIN MULTIPLE USER, MULTIPLE ACCESS, AND/OR MIMO WIRELESS COMMUNICATIONS - Transmission acknowledgement within multi-user wireless communication systems. Within multi-access wireless communication systems such as those operating in accordance with multi-user multiple input multiple output (MU-MIMO), orthogonal frequency division multiple access (OFDMA), and/or MU-MIMO/OFDMA, acknowledgement of receipt (e.g., using ACKs) is provided back to the sending or transmitting wireless communication device from each (or a subset) of the intended recipient wireless communication devices. Appropriate coordination of these ACKs from the respective, receiving wireless communication devices may be performed using instructions embedded within a multi-user packet that is provided to the receiving wireless communication devices. Alternatively, polling as effectuated by the sending or transmitting wireless communication device may be used to give explicit direction to the respective, receiving wireless communication devices of the manner by which their respective ACKs should be provided to the transmitting wireless communication device. | 12-09-2010 |
20110069778 | METHOD AND SYSTEM FOR ADAPTIVE MODULATIONS AND SIGNAL FIELD FOR CLOSED LOOP MULTIPLE INPUT MULTIPLE OUTPUT (MIMO) WIRELESS LOCAL AREA NETWORK (WLAN) SYSTEM - A method for communicating information is disclosed and includes, in a multiple-input-multiple-output (MIMO) communication system utilizing a plurality of modulation types and a plurality of spatial streams, determining an aggregate noise characteristic based upon a noise characteristic of each of the plurality of spatial streams. A receiver may be configured to receive subsequent data based on one or both of: a current modulation type for modulating a current spatial stream and at least one subsequent modulation type for modulating at least one subsequent spatial stream. The current modulation type and the at least one subsequent modulation type may be based on the determined aggregate noise characteristic. A constellation field may be encoded to uniquely identify a combination comprising the current modulation type, and the at least one subsequent modulation type. | 03-24-2011 |
20110116579 | Method and System for Utilizing Tone Grouping With Givens Rotations to Reduce Overhead Associated With Explicit Feedback Information - Aspects of a method and system for utilizing tone grouping with Givens rotations to reduce overhead associated with explicit feedback information are presented. In one aspect of the invention, Givens matrices may be utilized to reduce a quantity of information communicated in explicit feedback information via an uplink RF channel. The explicit feedback information may include specifications for a feedback beamforming matrix that may be utilized when transmitting signals via a corresponding downlink RF channel. The feedback beamforming matrix may represent a rotated version of an un-rotated matrix. The Givens matrices may be utilized to apply one or more Givens rotations to un-rotated matrix. The rotated matrix may reduce the quantity of information communicated in the explicit feedback information. The quantity of information communicated in the explicit feedback information may be further reduced by utilizing tone grouping. | 05-19-2011 |
20110206021 | REDUCED LATENCY CONCATENATED REED SOLOMON-CONVOLUTIONAL CODING FOR MIMO WIRELESS LAN - A wireless local area network (WLAN) transmitter includes a baseband processing module and a plurality of radio frequency (RF) transmitters. The baseband processing module operably coupled to scramble data in accordance with a pseudo random sequence to produce scrambled data. The baseband processing module is further operably coupled to interleave, at a word level, the scrambled data to produce interleaved data when the interleaving is enabled. The baseband processing module is further operably coupled to outer Reed-Solomon encode the scrambled data or the interleaved data to produce outer encoded data when the outer Reed-Solomon encoding is enabled. The baseband processing module is further operably coupled to inner puncture convolution encode the outer encoded data or the scrambled data to produce the encoded data. The baseband processing module is further operably coupled to determine a number of transmit streams based on a mode selection signal. The baseband processing module is further operably coupled to convert the encoded data into streams of symbols in accordance with the number of transmit streams and the mode selection signal. The plurality of radio frequency (RF) transmitters, when enabled, converts the streams of symbols into a corresponding number of RF signals. | 08-25-2011 |
20110222620 | Method and System for Frame Formats for MIMO Channel Measurement Exchange - A method and system for frame formats for MIMO channel measurement exchange is provided. Aspects of a method for communicating information in a communication system may comprise transmitting data via a plurality of radio frequency (RF) channels utilizing a plurality of transmitting antenna, receiving feedback information via at least one of a plurality of RF channels, and modifying a transmission mode based on the feedback information. Aspects of a method for communicating information in a communication system may also comprise receiving data via a plurality of receiving antenna, transmitting feedback information via at least one of the plurality of RF channels, and requesting modification of a transmission mode for the received data in transmitted response messages comprising the feedback information. | 09-15-2011 |