Patent application number | Description | Published |
20100008318 | SYSTEMS AND METHODS FOR PROVIDING A SEPARATE CONTENTION WINDOW ALLOWING ALLOCATIONS FOR PENDING UPLINK SDMA TRANSMISSION OPPORTUNITIES - A method for providing uplink spatial division multiple access (SDMA) transmission opportunities (TXOP) is described. A demarcation indication may be sent to one or more subscriber stations. An SDMA contention window may be started. An allocation indication may be received. Requested uplink SDMA TXOP resources may be allocated according to the allocation indication. | 01-14-2010 |
20100014448 | SYSTEMS AND METHODS FOR PARALLEL COMMUNICATION WITH LEGACY WLAN RECEIVERS - A method for parallel communication with wireless local area network (WLAN) receivers is described. A parallel transmission is started. A first MAC protocol data unit (MPDU) is sent to a first WLAN receiver. An acknowledgment (ACK) request is sent to the first WLAN receiver. An ACK is received from the first WLAN receiver. | 01-21-2010 |
20100046542 | MIMO AND SDMA SIGNALING FOR WIRELESS VERY HIGH THROUGHPUT SYSTEMS - Apparatuses for communication are disclosed, including processing systems configured to generate and/or receive a plurality of streams, each of the streams having one or more data packets including a plurality of portions, in which each of the portions in each of the data packets is coded and modulated independently of the other portions in the same data packet, the processing systems being further configured to code and modulate and/or decode and demodulate the data packets. Also disclosed are methods for generating and/or receiving a plurality of streams, each of the streams having one or more data packets comprising a plurality of portions, and for coding and modulating and/or decoding and demodulating each of the portions in each of the data packets independently of the other portions in the same data packet. | 02-25-2010 |
20100111234 | SYSTEM FOR SOFT SYMBOL DECODING MIMO LOG-MAP DETECTION - A soft symbol decoder for use in a multiple input multiple output (MIMO) and OFDM (orthogonal frequency division multiplexing) system. The decoder generates soft symbol values for a digital signal that represents a number of source bits. The source bits are transmitted as symbols in corresponding to points in a signaling constellation. Soft metrics are determined by searching for all possible multi-dimensional symbols that could have been transmitted. The method includes transmitting a sample of the multi-dimensional symbol using K transmit antennas. The multi-dimensional symbol is represent-able as a complex, K-dimensional vector x. Each vector component of vector x represents a signal transmitted with one of the K transmit antennas. After transmission through a communication channel, a sample corresponding to the transmitted sample is received. The received sample is represented by a complex, N-dimensional vector y, where N is the number of receive antennas in the MIMO system. After the sample is received, a soft metric L(b | 05-06-2010 |
20100290449 | PREAMBLE EXTENSIONS - Systems and/or methods for communication that generate a plurality of spatial streams are disclosed. Each of the spatial streams comprises a plurality of symbols. At least a portion of a training sequence is distributed across a first symbol in a first one of the spatial streams and a second symbol in a second one of the spatial streams. | 11-18-2010 |
20110051705 | MIMO AND MU-MIMO OFDM PREAMBLES - Certain aspects of the present disclosure present frame structures to support a plurality of standards, such as the IEEE 802.11 ac in addition to the IEEE 802.11 a/b/n/g. Preamble of the frame structure can be used by a receiver to detect transmission mode of the packet. | 03-03-2011 |
20110063991 | PHYSICAL LAYER SIGNALING OF CONTROL PARAMETERS - Certain aspects of the present disclosure relate to a technique for signaling common user parameters in Very High Throughput (VHT) wireless systems. | 03-17-2011 |
20110134899 | ENABLING PHASE TRACKING FOR A COMMUNICATION DEVICE - A communication device for enabling phase tracking is described. The communication device includes a processor and instructions stored in memory. The communication device generates a plurality of pilot symbols. The pilot symbols conform to a rank-deficient pilot mapping matrix. The communication device also transmits the plurality of pilot symbols. | 06-09-2011 |
20110188559 | REDUCING PHASE ERRORS ON A COMMUNICATION DEVICE - A communication device that is configured for reducing phase errors is described. The communication device includes a processor and instructions stored in memory. The communication device calculates a sum channel in the frequency domain, estimates one or more impulse responses and isolates an impulse response for one or more wireless communication devices. The communication device also calculates a phase error for each wireless communication device and reduces the phase error for each wireless communication device. | 08-04-2011 |
20110194544 | METHOD AND APPARATUS FOR CONSTRUCTING VERY HIGH THROUGHPUT LONG TRAINING FIELD SEQUENCES - Certain aspects of the present disclosure relate to techniques for constructing a training sequence as a part of transmission preamble in an effort to minimize (or at least reduce) a peak-to-average power ratio (PAPR) at a transmitting node. | 08-11-2011 |
20110194545 | METHOD AND APPARATUS FOR CONSTRUCTING VERY HIGH THROUGHPUT SHORT TRAINING FIELD SEQUENCES - Certain aspects of the present disclosure relate to a technique for constructing a short training field (STF) sequence of a Very High Throughput (VHT) preamble in an effort to reduce a peak-to-average power ratio (PAPR). The constructed STF sequence may feature a specific repetition period. | 08-11-2011 |
20110194655 | METHODS AND APPARATUS TO PERFORM RESIDUAL FREQUENCY OFFSET ESTIMATION AND CORRECTION IN IEEE 802.11 WAVEFORMS - Methods and apparatus are provided for performing and utilizing residual frequency offset estimation and correction in Institute of Electrical and Electronics Engineers (IEEE) 802.11 waveforms. Certain aspects of the present disclosure provide a technique for enabling one to perform good channel estimation with a signal-to-noise ratio (SNR)>33 dB, even in the presence of residual frequency errors. Further, certain aspects may enable one to support uplink Spatial Division Multiple Access (UL-SDMA), even in the presence of residual frequency offsets at the client side. | 08-11-2011 |
20110205913 | BEAMFORMING AND SDMA METHODS FOR WIRELESS LAN AND OTHER APPLICATIONS - Embodiments of the present disclosure present methods for calculating beamforming and spatial division multiple access (SDMA) weights utilizing minimum mean square error (MMSE) method. The beamforming and SDMA weights may also be normalized for further performance improvements. | 08-25-2011 |
20110211594 | TRAINING SEQUENCES FOR VERY HIGH THROUGHPUT WIRELESS COMMUNICATION - Methods and systems for communications that generate a plurality of spatial streams, wherein each of the spatial streams comprises a data packet with a training sequence; and multiply at least a portion of the training sequence in each of the spatial streams with a different spreading sequence. Methods and systems that receive a plurality of spatial streams, wherein each of the spatial streams comprises a data packet with a training sequence; multiply at least a portion of the training sequence in each of the spatial streams with a different spreading sequence; and decode the plurality of spatial streams based on the different spreading sequences. | 09-01-2011 |
20110235533 | PROTOCOL TO SUPPORT ADAPTIVE STATION-DEPENDENT CHANNEL STATE INFORMATION FEEDBACK RATE IN MULTI-USER COMMUNICATION SYSTEMS - Methods and apparatuses are proposed for supporting one or more user-dependent channel state information (CSI) feedback rates in a downlink spatial division multiple access (SDMA) system. For certain aspects, an access point (AP) may receive a channel evolution feedback from one or more stations and send a request for CSI to the stations whose CSI values need to be updated. For certain aspects, the AP may poll the stations for updated CSI values. For certain aspects, deterministic back-off timers may be assigned to the stations indicating when to send their CSI feedback. The proposed methods may improve system performance. | 09-29-2011 |
20110255620 | ALLOCATING AND RECEIVING TONES FOR A FRAME - A communication device for allocating tones is described that includes a processor and instructions in memory in electronic communication with the processor. The communication device determines whether a bandwidth for signal transmission is 20, 40, 80 or 160 megahertz (MHz). The communication device respectively allocates tones for 20, 40, 80 or 160 MHz as follows: for a very high throughput (VHT) signal A | 10-20-2011 |
20110299382 | COMMUNICATION DEVICES FOR GENERATING AND USING A MATRIX-MAPPED SEQUENCE - A communication device for generating a matrix-mapped sequence is described. The communication device includes sequence generation circuitry. The communication device also includes mapping circuitry coupled to the sequence generation circuitry. The mapping circuitry applies a first matrix with at least one column multiplied by −1 to a sequence. The communication device also includes a transmit block coupled to the mapping circuitry. | 12-08-2011 |
20110299468 | FORMAT OF VHT-SIG-B AND SERVICE FIELDS IN IEEE 802.11AC - Methods and apparatus for transmitting and receiving frames with various Very High Throughput Signal B (VHT-SIG-B) and Service field formats are provided. Some of these formats may be in accordance with the IEEE 802.11ac amendment to the wireless local area network (WLAN) standard. | 12-08-2011 |
20110305296 | USING A FIELD FORMAT ON A COMMUNICATION DEVICE - A communication device for transmitting a Very High Throughput Signal Field B (VHT-SIG-B) is described. The communication device includes a processor and instructions stored in memory that is in electronic communication with the processor. The communication device allocates at least twenty signal bits and six tail bits for the VHT-SIG-B. The communication device also uses a number of subcarriers for the VHT-SIG-B that is the same as a number of subcarriers for a Very High Throughput Long Training Field (VHT-LTF) and a DATA field. The communication device additionally applies a pilot mapping for the VHT-SIG-B that is the same as a pilot mapping for the DATA field. The communication device further transmits the VHT-SIG-B. | 12-15-2011 |
20110310870 | HYBRID TIME AND FREQUENCY DOMAIN CSI FEEDBACK SCHEME - In a downlink multi-user multiple input multiple output (DL MU-MIMO) system, channel state information (CSI) feedback duration may strongly affect media access control (MAC) efficiency. While a time domain compression may give a significant reduction in feedback duration, the time domain compression may have complexity issues at the station (STA). In particular, for time domain compression, a large complex matrix multiplication may be required at the client to estimate a cyclic prefix (CP) length impulse response, which best models the frequency response of the channel. Embodiments of the invention comprise a hybrid scheme that may reduce the above complexity while maintaining significant compression gains. | 12-22-2011 |
20120039198 | CONSTRUCTING VERY HIGH THROUGHPUT SIGNAL (VHT-SIG) FIELDS FOR REDUCED PEAK-TO-AVERAGE POWER RATIO (PAPR) - Certain aspects of the present disclosure relate to techniques for constructing a VHT-SIG field of a transmission preamble in a manner that may reduce peak-to-average power ratio (PAPR) of the transmission. | 02-16-2012 |
20120058735 | SOUNDING FEEDBACK SCHEMES FOR VERY HIGH THROUGHPUT WIRELESS SYSTEMS - Certain aspects of the present disclosure relate to techniques for transmitting sounding feedback in Very High Throughput (VHT) wireless systems. The sounding feedback may be transmitted from a user station (STA), wherein the feedback may comprise a certain number of beamforming matrices and a certain number of singular values of a wireless channel associated with the STA. Further, the sounding feedback may comprise a bit for indicating whether this feedback represents a Single-User (SU) feedback or a Multi-User (MU) feedback. | 03-08-2012 |
20120063429 | METHODS AND APPARATUS OF FREQUENCY INTERLEAVING FOR 80 MHz TRANSMISSIONS - Certain aspects of the present disclosure provide techniques and apparatus for frequency interleaving for use with 80 MHz transmissions, such as those in the IEEE 802.11ac amendment to the IEEE 802.11 standard. According to certain aspects, frequency interleaving spatial streams for transmissions on channels having widths of about 80 MHz may comprise using an interleaving depth of 26. The number of frequency rotations may be 58 (or 29) for up to four (or up to eight) spatial streams. According to certain aspects, frequency interleaving up to eight (or up to four) spatial streams for transmission on channels having widths of about 80 MHz may comprise performing frequency rotation for each of the spatial streams based on a frequency rotation index=[0 4 2 6 1 5 3 7] (or=[0 2 1 3]). | 03-15-2012 |
20120076081 | PROTECTION MECHANISMS FOR MULTI-USER MIMO TRANSMISSIONS - Certain aspects of the present disclosure relate to techniques for medium reservation in the case of multi-user (MU) communications. Multiple mechanisms are supported for protecting MU transmissions, wherein appropriate control messages can be exchanged between an access point and served user stations before transmitting downlink data packets. | 03-29-2012 |
20120087316 | PROTECTION MECHANISMS FOR MULTI-USER MIMO TRANSMISSIONS - Certain aspects of the present disclosure relate to techniques for medium reservation in the case of multi-user (MU) communications. Multiple mechanisms are supported for protecting MU transmissions, wherein appropriate control messages can be exchanged between an access point and served user stations before transmitting downlink data packets. | 04-12-2012 |
20120140842 | SIGNALING TO PROTECT ADVANCED RECEIVER PERFORMANCE IN WIRELESS LOCAL AREA NETWORKS (LANS) - Certain aspects of the present disclosure relate to techniques that may be used to help control aspects of beamforming by a beamformee. According to certain aspects, a beamformee may be able to signal, to a beamformer, a maximum number of transmit spatial streams to use for single-user beamformed transmissions. | 06-07-2012 |
20120213214 | DATA TRANSMISSION COEXISTENCE WITHIN TELEVISION WHITE SPACE CHANNELS - Methods, systems, and/or devices are provided that permit data transmissions over unused television channels. An unused channel within a television broadcast frequency spectrum is first identified. A downclocked waveform (for data transmission) is then generated by applying a factor to a clock that causes a waveform bandwidth to be reduced from a first bandwidth to a second bandwidth, wherein the second bandwidth of the downclocked waveform is less than a channel bandwidth for the identified unused channel. The downclocked waveform may then be configured so that it coexists with a larger waveform having a third bandwidth that is greater than the channel bandwidth. The downclocked waveform is then wirelessly transmitted from the transmitter device over the identified unused channel. | 08-23-2012 |
20120238226 | DATA TRANSMISSION COEXISTENCE USING CONSTANT SYMBOL DURATION WITHIN TELEVISION WHITE SPACE CHANNELS - Methods, systems, and/or devices are provided that permit data transmissions over unused television channels. An unused channel within a television broadcast frequency spectrum is first identified. A downclocked waveform (for data transmission) is then generated by applying a factor to a clock that causes a waveform bandwidth to be reduced from a first bandwidth to a second bandwidth, wherein the second bandwidth of the downclocked waveform is less than a channel bandwidth for the identified unused channel. The downclocked waveform may then be configured so that it coexists with a larger waveform having a third bandwidth that is greater than the channel bandwidth. The downclocked waveform is then wirelessly transmitted from the transmitter device over the identified unused channel. | 09-20-2012 |
20120250731 | SYSTEMS AND METHODS FOR MONITORING A WIRELESS NETWORK - Systems, methods, and devices to enable monitoring of wireless networks are described herein. In some aspects, a low power receiver or a receiver operating in a low power mode scans for signals with a moderate or low duty cycle. If a signal identifying a device or user of the receiver, or a signal indicating that there will be a subsequent data communication, is received, a high power receiver or a receiver operating in a high power mode is activated to receive data communications. | 10-04-2012 |
20120263156 | METHOD AND APPARATUS FOR GENERATING VARIOUS TRANSMISSION MODES FOR WLAN SYSTEMS - Certain aspects of the present disclosure relate to a technique for generating 40+40 MHz and 40+40+40+40 MHz transmission modes for IEEE 802.11 wireless communications systems using Very High Throughput (VHT) waveforms with application to Television White Space (TVWS) spectrum. | 10-18-2012 |
20120275376 | CHANNEL STATE INFORMATION FEEDBACK FRAME FORMAT AND FEEDBACK RULES FOR VERY HIGH THROUGHPUT WIRELESS SYSTEMS - Certain aspects of the present disclosure provide techniques and apparatus for generating a unified format of channel state information (CSI) feedback for Very High Throughput (VHT) wireless systems. One example method generally includes generating, at a first apparatus, a frame comprising information relating to SNR if a second apparatus is communicating with the first apparatus using single-user MIMO (SU-MIMO) or multi-user MIMO (MU-MIMO) and transmitting a signal based on the generated frame to the second apparatus. Another example method generally includes generating, at an apparatus, a structure comprising CSI, wherein the CSI includes one of a first matrix with estimates of a channel associated with the apparatus or a second matrix obtained based on singular value decomposition (SVD) of the first matrix and wherein the structure further comprises an indication of which of the first and second matrices is included in the CSI; and transmitting the structure over the channel. | 11-01-2012 |
20120281620 | BEAMFORMING FEEDBACK FORMAT - Certain aspects of the present disclosure propose transmitting a feedback message to an access point. The feedback may comprise a beamforming extension field, which may carry per tone signal to noise ratio of a station. For certain aspects, the station transmitting the per-tone SNR may be a single user (SU)-capable device. For certain aspects, the station may indicate to the access point whether or not it has a maximum likelihood (ML) receiver. | 11-08-2012 |
20120300864 | CHANNEL ESTIMATION BASED ON COMBINED CALIBRATION COEFFICIENTS - Calibration coefficients are combined to provide more robust calibration. In some implementations, calibration coefficients are generated by acquiring two or more sets of calibration coefficients that are associated with different periods of time, different receive devices, or some other condition. These different sets of calibration coefficients are then combined using maximal ratio combining or some other suitable technique. The resulting combined calibration coefficients are used to calibrate implicit channel estimates. | 11-29-2012 |
20120327868 | LOW-LATENCY INTERLEAVING FOR LOW-DENSITY PARITY-CHECK (LDPC) CODING - Certain aspects of the present disclosure relate to systems, devices, and methods for communicating over a plurality of tones and spatial streams. Modulation symbols may be mapped to tones and spatial streams so as to increase frequency and/or spatial diversity without substantially increasing latency. For certain aspects, this interleaving approach may be performed on low-density parity-check (LDPC) codewords. | 12-27-2012 |
20130058273 | STATION-CENTRIC MULTI-USER MULTIPLE INPUT MULTIPLE OUTPUT (MU-MIMO) - Certain aspects of the present disclosure provide techniques and apparatus for using a Media Access Control (MAC) address of a station (STA) sending a direct link multi-user multiple-input multiple-output (MU-MIMO) transmission such that one or more STAs receiving the transmission may interpret a group identifier (ID) indicating a group to which the STAs belong. Using the group ID and the MAC address allows a STA to independently manage its group IDs, independent of an access point (AP) or other STAs in a Basic Service Set (BSS). | 03-07-2013 |
20130070747 | Modified Preamble Structure for IEEE 802.11A Extensions to Allow for Coexistence and Interoperability Between 802.11A Devices and Higher Data Rate, MIMO or Otherwise Extended Devices - A modified preamble is used by extended devices that operate at higher rates, MIMO or other extensions relative to strict 802.11a-compliant devices. The extended devices might use multiple antenna techniques (MIMO), where multiple data streams are multiplexed spatially and/or multi-channel techniques, where an extended transmitter transmits using more than one 802.11a channel at a time. Such extensions to IEEE 802.11a can exist in extended devices. The modified preamble is usable for signaling, to legacy devices as well as extended devices, to indicate capabilities and to cause legacy devices or extended devices to defer to other devices such that the common communication channel is not subject to unnecessary interference. The modified preamble is also usable for obtaining MIMO channel estimates and/or multi-channel estimates. The modified preamble preferably includes properties that facilitate detection of conventional and/or extended modes (“mode detection”) and provides some level of coexistence with legacy IEEE 802.11a devices. | 03-21-2013 |
20130177090 | SYSTEMS AND METHODS FOR WIRELESS COMMUNICATION OF LONG DATA UNITS - Systems, methods, and devices for communicating long packets are described herein. In one aspect, an apparatus for wireless communication includes a receiver and a processor. The receiver wirelessly receives via wireless local area network a data unit comprising a plurality of training fields interposed between data symbols. The plurality of training fields includes a first training field followed by a second training field. The first training field includes a gain control sequence, and the second training field includes a channel estimation sequence. The processor decodes at least one data symbol based on the plurality of training fields. In another aspect, an apparatus for wireless communication includes a processor and a transmitter. The processor generates a data unit comprising a plurality of training fields inserted between data symbols, and the transmitter wirelessly transmits the data unit via wireless local area network. | 07-11-2013 |
20130179755 | SYSTEMS AND METHODS FOR LOW DENSITY PARITY CHECK TONE MAPPING - This disclosure provides systems, methods, and apparatus, including non-transitory computer-readable medium for tone mapping an error correction code for 1 MHz OFDM transmission. In one aspect, a wireless communications apparatus is provided. The wireless communications apparatus includes a tone mapper configured to tone map at least error correction codeword to data tones of an orthogonal frequency-division multiplexing (OFDM) symbol based on an error correction code tone mapping distance selected from the group consisting of 2, 3, and 4. The OFDM symbol has twenty four data tones, at least one pilot tone, a DC tone, and at least one guard tone. The wireless communications apparatus further includes a transmit module configured to transmit the at least one tone mapped error correction codeword using about a 1 MHz OFDM transmission mode. | 07-11-2013 |
20130208607 | METHOD AND APPARATUS FOR COMMUNICATING WITH EXTENDED RANGE IN A WIRELESS NETWORK - Techniques for supporting communication over an extended range in a wireless network are disclosed. In one aspect, a station sends multiple messages of a given type for different operating modes. These messages can be detected by stations with different capabilities, which may avoid collisions between stations. In one design, a first station receives a Request-to-Send (RTS) message from a second station having data to send. The first station sends a first Clear-to-Send (CTS) message and also a second CTS message in response to the RTS message. The second CTS message has an extended range as compared to the first CTS message. The first station thereafter (i) receives data sent by the second station in response to the second CTS message and (ii) sends an acknowledgement having an extended range. | 08-15-2013 |
20130208734 | SYSTEMS AND METHODS FOR COMMUNICATING AGGREGATED PACKETS INCLUDING DELIMITERS - Systems, methods, and computer program products for communicating aggregated packets including delimiters are described herein. In one aspect, a processor is configured to prepare a packet comprising an aggregated media access control service data unit (A-MSDU) having a plurality of MSDU subframes. Each MSDU subframe includes a MSDU subframe header and a MSDU. Further, the processor is configured to insert an indication of an end of the A-MSDU in the A-MSDU. A transmitter is configured to transmit the packet wirelessly. In another aspect, a receiver is configured to receive wirelessly a packet comprising an A-MSDU having a plurality of MSDU subframes and an indication of an end of the A-MSDU in the A-MSDU. A processor is configured to determine the end of the A-MSDU based on the indication. | 08-15-2013 |
20130223343 | SYSTEMS AND METHODS FOR APPLYING MULTI-SOURCE MULTIPLE-INPUT MULTIPLE-OUTPUT COMMUNICATIONS - A method for applying multi-source multiple-input multiple-output communications by a base station is described. The method includes obtaining data for transmission to a wireless communication device. The method also includes sending a second portion of the data to an assisting base station. The method also includes sending an indication frame that comprises an identifier of the wireless communication device to the assisting base station. The method also includes transmitting a first portion of the data on a first set of spatial streams. | 08-29-2013 |
20130230120 | APPARATUS AND METHODS FOR LONG AND SHORT TRAINING SEQUENCES FOR A FAST FOURIER TRANSFORM - Apparatus and methods for communicating and applying training sequences are described herein. For example, provided is a method for generating a short training field (STF) sequence comprising thirty two values or less. The STF sequence can include a first subset of values including zero and non-zero values. The non-zero values can be located at indices of the first subset that are at least a multiple of two, and can be a multiple of four. The STF sequence includes a second subset of zero values that can include all values not included within the first subset. The method further includes transmitting a data unit comprising the STF sequence over a wireless channel. In another example, a method is provided that includes generating a long training field (LTF) sequence comprising thirty two values or less, and transmitting a data unit comprising the LTF sequence over a wireless channel. | 09-05-2013 |
20130242963 | CONSTRUCTING VERY HIGH THROUGHPUT LONG TRAINING FIELD SEQUENCES - Certain aspects of the present disclosure relate to techniques for constructing a long training field (LTF) sequence in a preamble to reduce a peak-to-average power ratio (PAPR) at a transmitter. | 09-19-2013 |
20130266086 | SYSTEMS AND METHODS FOR TRANSMITTING PILOT TONES - Systems and methods for using travelling pilots for channel estimation are described herein. In one aspect, wireless communications apparatus is described that comprises a processor configured to divide a plurality of tones on which pilot signals are to be transmitted among a plurality of symbols, wherein each symbol includes less than all of the plurality of tones and the plurality of symbols includes at least a subset of the plurality of tones. The wireless communication apparatus further comprises a transmitter configured to transmit, during a given symbol, pilot signals on the tones included in the given symbol, wherein the tones over which the pilot signals are transmitted are changed from symbol to symbol. | 10-10-2013 |
20140029697 | GMSK-Based Modulation in a Wireless Local Area Network - A method includes modulating, at a first wireless device, a first signal based on a Gaussian minimum shift keying (GMSK) modulation scheme to generate a modulated signal. The method also includes amplifying, at the first wireless device, the modulated signal using a nonlinear power amplifier to generate an output signal. The method further includes transmitting, from the first wireless device to a second wireless device, an output signal generated based on the modulated signal via a wireless local area network (WLAN) that is compliant with an Institute of Electrical and Electronics Engineer (IEEE) 802.11ah specification. | 01-30-2014 |
20140064169 | DUTY CYCLED TRANSMISSIONS - Systems, methods, and devices for saving power in wireless communications devices are described herein. In some aspects, an apparatus for wireless communication includes a memory unit configured to store transmission power information, and a processor operationally coupled to the memory unit, the processor configured to retrieve the transmission power information from the memory unit and further configured to define, based at least partially on the transmission power information, a duration of the data segment and a duration of an idle time segment such that an average transmit power by a transmitter over the duration of the data segment and the duration of the idle time segment is below a threshold power value. | 03-06-2014 |
20140198872 | SYSTEMS AND METHODS FOR DETECTING OR SIGNALING THE PRESENCE OF BURSTY INTERFERENCE ON WIRELESS NETWORKS - Systems, methods, and devices for detecting and managing the presence of bursty interference on a wireless communication system are disclosed. One aspect of the subject matter described in the disclosure provides a method of detecting the presence of bursty interference on a wireless network. The method includes receiving, at a wireless device, a message from a transmitting device. The method further includes determining whether the message includes errors caused by bursty interference. The method further includes suspending a channel tracking when bursty interference is detected. In an embodiment the method further includes reporting bursty interference to the transmitting device when bursty interference is detected. | 07-17-2014 |
20140254389 | SYSTEMS AND METHODS FOR MONITORING WIRELESS COMMUNICATIONS - A method for multi-user multiple-input and multiple-output (MU-MIMO) sniffing by an electronic device is described. The method includes detecting multiple client second control fields concurrently. The method also includes detecting multiple client data fields concurrently. The method additionally includes obtaining data based on the multiple client data fields. | 09-11-2014 |
20140286324 | METHOD AND/OR SYSTEM FOR PASSIVE LOCATION ESTIMATION - Described are a system and method for a first wireless access point to compute timing parameters of neighboring access points based, at least in part, on beacon signals transmitted the neighboring access points. The first wireless access point may the broadcast the computed timing parameters to mobile devices. A mobile device having received the computed timing parameters may then compute an estimate of its location based, at least in part, on subsequently acquired beacon signals transmitted from the first access point and/or neighboring access points. | 09-25-2014 |
Patent application number | Description | Published |
20130201838 | SYSTEM AND METHOD FOR INFORMATION VERIFICATION BASED ON CHANNEL AWARENESS - This disclosure describes techniques for operating a client device to communicate with a wireless access point to validate data within a frame by comparing channel quality metrics and duration metrics to thresholds. Information received within a validity window may be treated as correctly received even if the frame fails a subsequent verification process or if reception of the frame is terminated prior to the end of the frame. | 08-08-2013 |
20130322563 | COMMUNICATION DEVICE, METHOD, COMPUTER-PROGRAM PRODUCT AND APPARATUS FOR TRANSMITTING A PILOT SEQUENCE WITH A REDUCED PEAK-TO-AVERAGE POWER RATIO CONTRIBUTION - A communication device for transmitting a pilot sequence is described. The communication device includes pilot generation circuitry configured for generating a pilot sequence with a reduced peak-to-average power ratio contribution after rotation. The communication device also includes transmitter circuitry configured for transmitting the pilot sequence. | 12-05-2013 |
20140064221 | BEAMFORMING FEEDBACK OPTIONS FOR MU-MIMO - Beamforming may be used in MIMO communication systems to further enhance spectral efficiency. Beamforming refers to beamed transmissions to a single destination (e.g., a station) at a time, to enhance the rate and/or range of transmission. To perform beamforming from a source to one or more destinations, a channel and/or beamforming matrices corresponding to the channel needs to be known at the source, which may be obtained as feedback from the destination. However, the beamforming matrices may not be smooth over frequency as it is fed back from the destination. Therefore, certain aspects of the present disclosure provide beamforming feedback options, resulting in the smoothness of a beamforming matrix. | 03-06-2014 |
20140064396 | BEAMFORMING FEEDBACK OPTIONS FOR MU-MIMO - Beamforming may be used in MIMO communication systems to further enhance spectral efficiency. Beamforming refers to beamed transmissions to a single destination (e.g., a station) at a time, to enhance the rate and/or range of transmission. To perform beamforming from a source to one or more destinations, a channel and/or beamforming matrices corresponding to the channel needs to be known at the source, which may be obtained as feedback from the destination. However, the beamforming matrices may not be smooth over frequency as it is fed back from the destination. Therefore, certain aspects of the present disclosure provide beamforming feedback options, resulting in the smoothness of a beamforming matrix. | 03-06-2014 |
20140079048 | PREAMBLE EXTENSIONS - Systems and/or methods for communication generate a plurality of spatial streams. Each of the spatial streams comprises a plurality of symbols. At least a portion of a training sequence is distributed across a first symbol in a first one of the spatial streams and a second symbol in a second one of the spatial streams. | 03-20-2014 |
20140211704 | EXTENDING RANGE AND DELAY SPREAD IN WIFI BANDS - Certain aspects of the present disclosure relate to methods and apparatus for extending range and delay spread in 2.4 and 5 GHz bands, and potentially frequency multiplexing users. An apparatus is provided for wireless communications. The apparatus generally includes a processing system configured to generate a packet comprising a first preamble decodable by a first type of device and a second type of device, a second preamble that is decodable by the second type of device, but not the first type of device, and data and a transmitter configured to transmit the packet, wherein the first preamble is transmitted using a first channel bandwidth and the second preamble and data are transmitted using only a portion of the first channel bandwidth. | 07-31-2014 |
20140211775 | LARGER DELAY SPREAD SUPPORT FOR WIFI BANDS - Aspects of the present disclosure provide techniques that may help address the effects of larger delay spreads in WiFi bands. Methods and apparatus are provided that perform wireless communications utilizing varying cyclic prefix lengths, varying repetition intervals, and varying symbol durations to ameliorate the effects of large delay spreads. | 07-31-2014 |
20150023335 | PHYSICAL LAYER DESIGN FOR UPLINK (UL) MULTIUSER MULTIPLE-INPUT, MULTIPLE-OUTPUT (MU-MIMO) IN WIRELESS LOCAL AREA NETWORK (WLAN) SYSTEMS - Certain aspects of the present disclosure provide methods and apparatus for uplink (UL) multiuser multiple-input, multiple-output (MU-MIMO) transmissions in a High Efficiency WLAN (HEW) system. One example method generally includes generating a packet having a preamble portion and transmitting the packet. The preamble portion typically includes a long training field (LTF); a first signal (SIG) field subsequent to the LTF; one or more other LTFs located subsequent to the first SIG field; and at least one second SIG field, wherein all SIG fields in the preamble portion, other than the first SIG field, are subsequent to the one or more other LTFs. Another example method generally includes receiving, from an apparatus, a packet having a preamble portion comprising tone-interleaved LTFs; and performing frequency offset adjustment on the packet based on the tone-interleaved LTFs. | 01-22-2015 |
20150063288 | METHOD AND APPARATUS FOR CONSTRUCTING VERY HIGH THROUGHPUT LONG TRAINING FIELD SEQUENCES - Certain aspects of the present disclosure relate to techniques for constructing a training sequence as a part of transmission preamble in an effort to minimize (or at least reduce) a peak-to-average power ratio (PAPR) at a transmitting node. | 03-05-2015 |
20150071084 | SYSTEM AND METHOD FOR INFORMATION VERIFICATION BASED ON CHANNEL AWARENESS - This disclosure describes techniques for operating a client device to communicate with a wireless access point to validate data within a frame by comparing channel quality metrics and duration metrics to thresholds. Information received within a validity window may be treated as correctly received even if the frame fails a subsequent verification process or if reception of the frame is terminated prior to the end of the frame. | 03-12-2015 |
20150078368 | ENHANCEMENTS TO THE MU-MIMO VHT PREAMBLE TO ENABLE MODE DETECTION - Certain aspects of the present disclosure present a technique for enabling a receiver to detect mode of transmission of a signal based on a common field transmitted to all the receivers. The proposed technique includes frame structure in which information about the transmission mode is transmitted in a first portion of a SIG field to all the receivers. | 03-19-2015 |