Patent application number | Description | Published |
20080220787 | Channel Aggregation - Multiple channels are aggregated. In an example embodiment, first data is transmitted on a first channel to a wireless device, and second data is simultaneously transmitted on a second channel to the wireless device. The first data and the second data are transmitted in a coordinated manner by aggregating the first channel and the second channel. Various example channel characteristics and combinations thereof are described. Different data allocation options for aggregated channels are described. Other alternative implementations are also presented herein. | 09-11-2008 |
20080220788 | Multi-band Channel Aggregation - Multiple channels are aggregated. In an example embodiment, first data is transmitted on a first channel to a wireless device, and second data is simultaneously transmitted on a second channel to the wireless device. The first data and the second data are transmitted in a coordinated manner by aggregating the first channel and the second channel. Various example channel characteristics and combinations thereof are described. Different data allocation options for aggregated channels are described. Other alternative implementations are also presented herein. | 09-11-2008 |
20080233945 | Methods and Apparatus for Identifying Subscriber Station Mobility - Methods and apparatus for identifying a subscriber station which is in motion, determining a mobility metric indicative of a level of mobility of the subscriber station and varying or updating one or more operating parameters based on the mobility metric. An apparatus can determine a measure of mobility based on one or a combination of a plurality of factors, such as variations in signal strength, variations in a channel estimate, or variations in phase or frequency of a particular signal or signal component. The one or more measures of mobility can be combined to form a single measure of mobility, the measure of mobility can be quantized to a predetermined number of mobility levels and one or more operating parameters can be varied or adjusted based on the mobility level. | 09-25-2008 |
20080253320 | System and Method for Facilitating Co-Channel and Co-Existence Via Enhanced Frame Preambles - Enhanced frame preambles facilitate co-channel co-existence in a wireless communication environment by having at least one preamble characteristic that connotes channel-sharing information regarding the wireless communication environment. In an exemplary embodiment, a downlink subframe is received in one or more wireless communication signals in a wireless communication environment. A preamble is detected in the downlink subframe, and at least one characteristic of the preamble is ascertained. Channel-sharing information for the wireless communication environment is determined based upon the at least one characteristic of the preamble. In another exemplary embodiment, a channel is scanned to detect secondary preambles being transmitted on the channel. A current preamble configuration, including a permutation of preamble location and preamble content corresponding to the secondary preambles, is determined, which connote channel-sharing information. A next available preamble location may be adopted based on the current preamble configuration. | 10-16-2008 |
20090116427 | ADVANCED TECHNOLOGY FRAME STRUCTURE WITH BACKWARD COMPATIBILITY - An advanced technology frame structure is described herein. The advanced technology frame structure can enhance a first technology frame structure in dimensions of time, frequency, or a combination of time and frequency. A second technology frame structure time division multiplexes second technology subframes with the first technology downlink and uplink subframes. The first technology downlink subframe can be divided into a first technology downlink subframe and one or more second technology downlink subframes. Similarly, the first technology uplink subframe can be divided into a first uplink subframe and one or more second technology uplink subframes. These principles can be expanded upon and can be applied in many communication systems. | 05-07-2009 |
20090190465 | Downlink Acquisition - The subject matter disclosed herein provides methods and apparatus, including computer program products, for detecting a preamble to enable acquisition of a downlink. In one aspect, there is provided a method. The method may include receiving a plurality of symbols. From an autocorrelation of the received symbols, a guard interval may be detected. The guard interval may represent a receive/transmit transition gap (RTG). A metric may be used to verify whether at least one symbol positioned after the detected guard interval is a preamble. Related systems, apparatus, methods, and/or articles are also described. | 07-30-2009 |
20090264142 | INTERCELL INTERFERENCE MITIGATION - Methods and apparatus are described for mitigating intercell interference in wireless communication systems utilizing substantially the same operating frequency band across multiple neighboring coverage areas. The operating frequency band may be shared across multiple neighboring or otherwise adjacent cells, such as in a frequency reuse one configuration. The wireless communication system can synchronize one or more resource allocation regions or zones across the multiple base stations, and can coordinate a permutation type within each resource allocation zone. The base stations can coordinate a pilot configuration in each of a plurality of coordinated resource allocation regions. Subscriber stations can be assigned resources in a coordinated resource allocation region based on interference levels. A subscriber station can determine a channel estimate for each of multiple base stations in the coordinated resource allocation region to mitigate interference. | 10-22-2009 |
20100009707 | SIGNAL TRANSMISSION PARAMETER CONTROL USING CHANNEL SOUNDING - A base station (BTS) may instruct a client station (CS) to transmit sounding signals that the BTS may analyze to determine what adjustments, such as power, time, and/or frequency adjustment(s) should be made by the CS. The BTS may control when and how the sounding signals are sent by the CS. This helps reduce the possibility of adjustment signals transmitted by two or more CSs colliding. Thus, sounding signals transmitted by the CS in response to a request by the BTS can be received by the BTS with higher a probability of success. This permits the BTS to more accurately characterize the channel and to provide better adjustment of power level, frequency offset, and/or timing offset for more optimal communication. Such techniques can be used to reduce bit error rates and to improve the overall signal to noise ratio encountered by the system. | 01-14-2010 |
20100226455 | Closed Loop Mimo Harmonized Feedback - The subject matter disclosed herein provides methods and apparatus for closed loop operation of a wireless system implementing multiple input multiple output (MIMO). In one aspect, there is provided a method. The method may include receiving a payload including channel estimation information. Moreover, one or more bits of the payload may be inserted into a subset of the tiles of a slot. The slot including the subset of the tiles carrying the one or more bits of the payload may be provided as part of a closed loop MIMO-based system. Related systems, apparatus, methods, and/or articles are also described. | 09-09-2010 |
20100272014 | Parametric Compression of Rank-1 Analog Feedback - Channel state information in a closed-loop, multiple-input, multiple-output wireless networks is fed back from each mobile station to a base station by first determining a transmit covariance matrix R, and applying a singular value decomposition (SVD) R=UΣV | 10-28-2010 |
20110164700 | CLOSED FORM SINGULAR VALUE DECOMPOSITION - The subject matter disclosed herein provides methods and apparatus for determining a singular value decomposition, providing feedback from a client station to a base station, and closed loop operation of a wireless system implementing multiple-input multiple-output (MIMO). The method may include determining one or more singular vectors using a closed form singular value decomposition. The one or more determined singular vectors may be provided to a precoder at the base station as feedback. The method may include aligning a phase of one or more singular vectors. The method may also include determining, at a client station, a plurality of singular vectors for channels used in a MIMO transmission from a base station to a client station. The client station may provide an indication to the base station regarding whether to use a singular value decomposition or a uniform channel decomposition. Related systems, apparatus, methods, and/or articles are also described. | 07-07-2011 |
20110242964 | DOWNLINK ACQUISITION - The subject matter disclosed herein provides methods and apparatus, including computer program products, for detecting a preamble to enable acquisition of a downlink. In one aspect, there is provided a method. The method may include receiving a plurality of symbols. From an autocorrelation of the received symbols, a guard interval may be detected. The guard interval may represent a receive/transmit transition gap (RTG). A metric may be used to verify whether at least one symbol positioned after the detected guard interval is a preamble. Related systems, apparatus, methods, and/or articles are also described. | 10-06-2011 |
20120033566 | HYBRID FEEDBACK FOR CLOSED LOOP MULTIPLE-INPUT MULTIPLE- OUTPUT - The subject matter disclosed herein provides methods and apparatus for closed loop operation of a wireless system implementing multiple input and multiple output (MIMO). In one aspect, there is provided a method. The method may provide channel estimation feedback to a base station by a user equipment in a wireless communication system. The method includes receiving downlink data from the base station, calculating a digital portion representing a channel parameter estimation of the downlink data, calculating an analog portion representing an error estimation of the digital portion and providing, as feedback, the digital portion and the analog portion to the base station. | 02-09-2012 |
20120033592 | Explicit feedback format within single user, multiple user, multiple access, and/or MIMO wireless communications - Explicit feedback format within single user, multiple user, multiple access, and/or MIMO wireless communications. A beamformer provides a first communication to a beamformee, and based thereon, the beamformee may ascertain certain characteristics associated with the type and format of feedback to be provided to the beamformee via a second communication from the beamformee to the beamformer. For example, the first communication may include indication of a current operational mode, such as whether it is in accordance with single-user multiple input multiple output (SU-MIMO) or multi-user multiple-input-multiple-output (MU-MIMO). Also, the first communication may indicate a requested steering matrix's rank to be employed in accordance with subsequent beamforming by the beamformer. Also, additional information such as that pertaining to per-tone SNR values for each respective space-time stream, per-tone or per-sub-band eigen-values, the particular channel width being employed (e.g., 20, 40, 80, or 160 MHz), etc. may be included within the second communication. | 02-09-2012 |
20120034949 | SIGNAL TRANSMISSION PARAMETER CONTROL USING CHANNEL SOUNDING - A base station (BTS) may instruct a client station (CS) to transmit sounding signals that the BTS may analyze to determine what adjustments, such as power, time, and/or frequency adjustment(s) should be made by the CS. The BTS may control when and how the sounding signals are sent by the CS. This helps reduce the possibility of adjustment signals transmitted by two or more CSs colliding. Thus, sounding signals transmitted by the CS in response to a request by the BTS can be received by the BTS with higher a probability of success. This permits the BTS to more accurately characterize the channel and to provide better adjustment of power level, frequency offset, and/or timing offset for more optimal communication. Such techniques can be used to reduce bit error rates and to improve the overall signal to noise ratio encountered by the system. | 02-09-2012 |
20120044829 | SYSTEM AND METHOD FOR FACILITATING CO-CHANNEL AND CO-EXISTENCE VIA ENHANCED FRAME PREAMBLES - Enhanced frame preambles facilitate co-channel co-existence in a wireless communication environment by having at least one preamble characteristic that connotes channel-sharing information regarding the wireless communication environment. In an exemplary embodiment, a downlink subframe is received in one or more wireless communication signals in a wireless communication environment. A preamble is detected in the downlink subframe, and at least one characteristic of the preamble is ascertained. Channel-sharing information for the wireless communication environment is determined based upon the at least one characteristic of the preamble. In another exemplary embodiment, a channel is scanned to detect secondary preambles being transmitted on the channel. A current preamble configuration, including a permutation of preamble location and preamble content corresponding to the secondary preambles, is determined, which connote channel-sharing information. A next available preamble location may be adopted based on the current preamble configuration. | 02-23-2012 |
20120069759 | METHODS AND APPARATUS FOR IDENTIFYING SUBSCRIBER STATION MOBILITY - Methods and apparatus for identifying a subscriber station which is in motion, determining a mobility metric indicative of a level of mobility of the subscriber station and varying or updating one or more operating parameters based on the mobility metric. An apparatus can determine a measure of mobility based on one or a combination of a plurality of factors, such as variations in signal strength, variations in a channel estimate, or variations in phase or frequency of a particular signal or signal component. The one or more measures of mobility can be combined to form a single measure of mobility, the measure of mobility can be quantized to a predetermined number of mobility levels and one or more operating parameters can be varied or adjusted based on the mobility level. | 03-22-2012 |
20120087304 | Differential feedback within single user, multiple user, multiple access, and/or MIMO wireless communications - Differential feedback within multiple user, multiple access, and/or MIMO wireless communications. After full feedback signal(s) have been received by a communication device (e.g., one that is to be performing beamforming for use in subsequent signal transmission), differential feedback signal(s) are received. Those differential feedback signal(s) are employed to update the full feedback signal(s) thereby generating updated/modified full feedback signals. Over time, such updated/modified full feedback signals may subsequently be further updated based upon later received inferential feedback signal(s). Such differential feedback signaling takes advantage of time and/or frequency correlation in a communication channel to provide for reduced feedback overhead by feeding back a difference or delta (Δ) relative to a previous value. For example, instead of providing full feedback signals in each respective/successive communication, feedback overhead is reduced by providing a difference or delta (Δ). | 04-12-2012 |
20120140730 | ADVANCED TECHNOLOGY FRAME STRUCTURE WITH BACKWARD COMPATABILITY - An advanced technology frame structure is described herein. The advanced technology frame structure can enhance a first technology frame structure in dimensions of time, frequency, or a combination of time and frequency. A second technology frame structure time division multiplexes second technology subframes with the first technology downlink and uplink subframes. The first technology downlink subframe can be divided into a first technology downlink subframe and one or more second technology downlink subframes. Similarly, the first technology uplink subframe can be divided into a first uplink subframe and one or more second technology uplink subframes. These principles can be expanded upon and can be applied in many communication systems. | 06-07-2012 |
20120163254 | MULTI-BAND CHANNEL AGGREGATION - Multiple channels are aggregated. In an example embodiment, first data is transmitted on a first channel to a wireless device, and second data is simultaneously transmitted on a second channel to the wireless device. The first data and the second data are transmitted in a coordinated manner by aggregating the first channel and the second channel. Various example channel characteristics and combinations thereof are described. Different data allocation options for aggregated channels are described. Other alternative implementations are also presented herein. | 06-28-2012 |
20120263090 | Frequency selective transmission within single user, multiple user, multiple access, and/or MIMO wireless communications - Frequency selective transmission within single user, multiple user, multiple access, and/or MIMO wireless communications. Adaptation among different respective sub-channels and/or channels is effectuated within a wireless communication system. Such a wireless communication system may include an access point (AP) and one or more wireless stations (STAs). The respective channelization employed for various communications between the devices within such a wireless communication system may be adapted based upon any of a number of considerations. For example, a receiver communication device may indicate to a transmitter communication device one or more preferred sub-channels and/or channels on which subsequent communications are to be performed. Alternatively, a transmitter communication device may employ such information provided from one or more receiver communication devices as one of multiple respective considerations regarding which one or more sub-channels and/or channels on which subsequent communications are to be performed. | 10-18-2012 |
20120263157 | Downclocking and/or adaptive sub-carriers for single user, multiple user, multiple access, and/or MIMO wireless communications - Downclocking and/or adaptive sub-carriers for single user, multiple user, multiple access, and/or MIMO wireless communications. Communication device operation within a wireless local area network (WLAN/WiFi) is effectuated in the frequency spectra typically associated with television broadcast channels. Operation is made on a secondary non-interfering basis to such television broadcast channels. Any desired channel bandwidth (e.g., 6 MHz, 7 MHz, 8 MHz, etc.) may be employed. Adaptation with respect to the number of data sub-carriers within different respective packets may be made in accordance with two or more respective operational modes. For example, modification of the number of data sub-carriers in different respective packets may be made to increase the signal bandwidth from a first band was to a second bandwidth. Also, appropriate frequency down-clocking of a first channel bandwidth may be performed to generate the desired channel bandwidth to be employed within an available television broadcast channel bandwidth. | 10-18-2012 |
20120263211 | Range extension within single user, multiple user, multiple access, and/or MIMO wireless communications - Range extension within single user, multiple user, multiple access, and/or MIMO wireless communications. A given communication device designed and implemented for operation in accordance with a given communication protocol, standard, and/or recommended practice operates in accordance with a down-clocked manner to effectuate operation in accordance with at least one other communication protocol, standard, and/or recommended practice. For example, first channelization may undergo down-clocking by a particular and desired ratio to generate a second channelization. As such, at least one portion of a physical layer (PHY) of a given communication device may be leveraged for use in at least one other or additional operational mode based upon the down-clocking employed. Sub-channel and/or channel adaptation may be made based upon any of a number of considerations (e.g., independently by one device, cooperatively by two or more devices, local and/or remote operating condition(s) [or changes thereof], etc.). | 10-18-2012 |
20120269069 | Device coexistence within single user, multiple user, multiple access, and/or MIMO wireless communications - Device coexistence within single user, multiple user, multiple access, and/or MIMO wireless communications. Different respective communication devices operating using different respective communication channels having different respective channel bandwidths may be implemented within a given communication system. For example, different respective communication devices may belong to different basic services sets (BSSs) (e.g., a 1 MHz BSS operating using channel bandwidths of 1 MHz, and a 2 MHz BSS operating using channel bandwidths of 2 MHz). To effectuate coexistence among different respective devices operating using different respective channel bandwidths, devices but longing to the 1 MHz BSS monitor for and listen for 2 MHz wide communication activity, and those 1 MHz BSS communication devices defer to any detected communication activity on any portion of the 2 MHz channel. | 10-25-2012 |
20120269123 | Preamble for use within single user, multiple user, multiple access, and/or MIMO wireless communications - Preamble for use within single user, multiple user, multiple access, and/or MIMO wireless communications. A selected preamble type is employed for use in generating a signal to be transmitted from one communication device to at least one other communication device. Depending upon a desired operational mode, as few as one preamble type, or two or more preamble types may be associated with a given operational mode. When operating in accordance with a given operational mode, a preamble type is selected from available preamble types of an operational mode. A preferred implementation may include two respective preamble types such that one preamble type is used for single user (SU) operation with transmit beamforming weights applied at the beginning of the packet or for open loop SU transmissions only, while the other preamble type, having an multiple user (MU) characteristic, is used for both SU beamforming and MU operations. | 10-25-2012 |
20120269124 | Long training field (LTF) for use within single user, multiple user, multiple access, and/or MIMO wireless communications - Long training field (LTF) for use within single user, multiple user, multiple access, and/or MIMO wireless communications. Classification of a signal may be performed using one or more LTF's therein. While such one or more LTF's may also be employed for performing functions such as channel estimation, channel characterization, etc., one or more particular characteristics of an LTF extracted from a received signal may also be employed to classify the signal as corresponding to one of a number of possible signal types. For example, such LTF-based classification may be used to classify the respective channel bandwidths associated with the signal (e.g., as being either 1 MHz or 2 MHz channel bandwidth). Generally, one or more LTF fields within one or more signals are employed for any of a number of additional uses beyond or in addition to such functions as channel estimation, channel characterization, etc. | 10-25-2012 |
20120269125 | Short training field (STF) for use within single user, multiple user, multiple access, and/or MIMO wireless communications - Short training field (STF) for use within single user, multiple user, multiple access, and/or MIMO wireless communications. An STF design as is made such that the power associated with the tone indices at the edges of the STF design is relatively less than the power associated with the tone indices more centrally located within the STF design. Also, when multiple respective operational modes are supported (e.g., | 10-25-2012 |
20120269142 | Doppler adaptation using pilot patterns within single user, multiple user, multiple access, and/or MIMO wireless communications - Doppler adaptation using pilot patterns within single user, multiple user, multiple access, and/or MIMO wireless communications. Within a communication system employing orthogonal frequency division multiplexing (OFDM) signaling, pilots may be adaptively and/or selectively located at different respective sub-carrier or tone locations within different respective symbols based on one or more patterns. In some implementations, decimation may also be performed such that not necessarily all respective tone or sub-carrier locations are covered within one particular group. Multiple respective groups may be employed to cover all possible tone or sub-carrier locations with at least one pilot over a particular number of symbols. In a receiver communication device operating using such decimation, interpolation over the decimated set of tones or sub-carriers may be made to effectuate channel estimate updates. | 10-25-2012 |
20120320882 | INTERCELL INTERFERENCE MITIGATION - Methods and apparatus are described for mitigating intercell interference in wireless communication systems utilizing substantially the same operating frequency band across multiple neighboring coverage areas. The operating frequency band may be shared across multiple neighboring or otherwise adjacent cells, such as in a frequency reuse one configuration. The wireless communication system can synchronize one or more resource allocation regions or zones across the multiple base stations, and can coordinate a permutation type within each resource allocation zone. The base stations can coordinate a pilot configuration in each of a plurality of coordinated resource allocation regions. Subscriber stations can be assigned resources in a coordinated resource allocation region based on interference levels. A subscriber station can determine a channel estimate for each of multiple base stations in the coordinated resource allocation region to mitigate interference. | 12-20-2012 |
20130058426 | CLOSED FORM SINGULAR VALUE DECOMPOSITION - The subject matter disclosed herein provides methods and apparatus for determining a singular value decomposition, providing feedback from a client station to a base station, and closed loop operation of a wireless system implementing multiple-input multiple-output (MIMO). The method may include determining one or more singular vectors using a closed form singular value decomposition. The one or more determined singular vectors may be provided to a precoder at the base station as feedback. The method may include aligning a phase of one or more singular vectors. The method may also include determining, at a client station, a plurality of singular vectors for channels used in a MIMO transmission from a base station to a client station. The client station may provide an indication to the base station regarding whether to use a singular value decomposition or a uniform channel decomposition. Related systems, apparatus, methods, and/or articles are also described. | 03-07-2013 |
20130114546 | MULTI-BAND CHANNEL AGGREGATION - Multiple channels are aggregated. In an example embodiment, first data is transmitted on a first channel to a wireless device, and second data is simultaneously transmitted on a second channel to the wireless device. The first data and the second data are transmitted in a coordinated manner by aggregating the first channel and the second channel. Various example channel characteristics and combinations thereof are described. Different data allocation options for aggregated channels are described. Other alternative implementations are also presented herein. | 05-09-2013 |
20130122950 | SIGNAL TRANSMISSION PARAMETER CONTROL USING CHANNEL SOUNDING - A base station (BTS) may instruct a client station (CS) to transmit sounding signals that the BTS may analyze to determine what adjustments, such as power, time, and/or frequency adjustment(s) should be made by the CS. The BTS may control when and how the sounding signals are sent by the CS. This helps reduce the possibility of adjustment signals transmitted by two or more CSs colliding. Thus, sounding signals transmitted by the CS in response to a request by the BTS can be received by the BTS with higher a probability of success. This permits the BTS to more accurately characterize the channel and to provide better adjustment of power level, frequency offset, and/or timing offset for more optimal communication. Such techniques can be used to reduce bit error rates and to improve the overall signal to noise ratio encountered by the system. | 05-16-2013 |
20130201912 | METHOD AND APPARATUS FOR COMPRESSING CHANNEL STATE INFORMATION BASED ON PATH LOCATION INFORMATION - Methods and apparatus are described for compressing channel state information (CSI) in time-domain based on path location information for CSI feedback. Downlink (DL) CSI is compressed in the time domain and fed back by not sending the multipath location information, or sending at a very low rate. In one method, a wireless transmit/receive unit (WTRU) selects the strongest multipath components based on channel characteristics. The multipath components are quantized in the time domain via direct or vector based quantization. The base station reconstructs a channel impulse response from the fed back quantized multipath components and applies same to precoding processing. In another method, the WTRU feeds back information associated with a narrowband portion(s) of a system spectrum. The selected narrowband portion(s) have sufficient density over time to allow good precoding per subband or across the system spectrum. Short term feedback may be augmented with long term channel information. | 08-08-2013 |
20130223348 | SYSTEM AND METHOD FOR FACILITATING CO-CHANNEL AND CO-EXISTENCE VIA ENHANCED FRAME PREAMBLES - Methods and apparatus are described to facilitate co-channel co-existence in a wireless communication environment. First information and second information related to a shared channel may be transmitted. The first information may be transmitted across a plurality of subcarriers over a first symbol set of a subframe and the second information may be transmitted within a subset of the plurality of subcarriers over a second symbol set of the subframe. The second information may include channel-sharing information regarding the wireless communication environment. The channel-sharing information may reduce intercell interference with at least one other base station. | 08-29-2013 |
20130286938 | Frame formatting for communications within single user, multiple user, multiple access, and/or MIMO wireless communications - Frame formatting for communications within single user, multiple user, multiple access, and/or MIMO wireless communications. A signal is processed within a communication device using at least two respective downclocking ratios (e.g., a first downclocking ratio applied to a first portion of the signal such as a frame or packet extracted there from, a second downclocking ratio applied to a second portion of the signal). Alternatively, a signal is divided into more than two respective portions, and different respective downclocking ratios are applied to those different respective portions (e.g., a first downclocking ratio applied to a first portion of the signal, and so on up to an n-th downclocking ratio applied to an n-th portion of the signal). Some implementations apply a singular or common downclocking ratio to more than one portion of the signal (which may be contiguous/adjacent or non-contiguous/non-adjacent within the signal). | 10-31-2013 |
20130301555 | Multi-channel support within single user, multiple user, multiple access, and/or MIMO wireless communications - Multi-channel support within single user, multiple user, multiple access, and/or MIMO wireless communications. A communication device is implemented to encode information bit(s) to encoded bits, which subsequently can undergo processing by an interleaver that is implemented to generate interleaved bits. A constellation mapper is implemented to map the interleaved bits to constellation(s) to generate mapped signals. Two or more inverse discrete fast Fourier transform (IDFT) processors are respectively implemented to process the mapped signals to generate signal streams. For example, a first IDFT processor is implemented to process a first of the mapped signals to generate a first signal stream, and a second IDFT processor is implemented to process a second of the mapped signals to generate a second signal stream. Such a communication device also includes communication interface(s) to transmit the signal streams to at least one additional communication device. | 11-14-2013 |
20130301556 | Multi-channel support within single user, multiple user, multiple access, and/or MIMO wireless communications - Multi-channel support within single user, multiple user, multiple access, and/or MIMO wireless communications. A processor of the communication device is implemented to process a signal to generate processed signals. Also, the communication device includes multiple inverse discrete fast Fourier transform (IDFT) processors respectively to process the processed signals to generate a signal streams respectively across channels (e.g., a first of the IDFT processors is implemented to process a first processed signal to generate a first signal stream based on a fast Fourier transform (FFT) channelization across a first number of orthogonal frequency division multiplexing (OFDM) tones, and a second of the IDFT processors is implemented to process a second processed signal to generate a second signal stream based on the FFT channelization across a second number of OFDM tones). The communication device also includes communication interface(s) to transmit the signal streams to at least one additional communication device. | 11-14-2013 |
20130315169 | Peak to average power ratio (PAPR) reduction for repetition mode within single user, multiple user, multiple access, and/or MIMO wireless communications - Selective processing of one or more packets to be transmitted from a wireless communication device to another wireless communication device is effective to reduce the peak to average power ratio (PAPR) of the transmission. The one or more packets are transmitted via two or more sub-bands of an available transmission medium. The number of coefficients or factors within that sequence corresponds to the number of sub-bands via which the one or more packets are to be transmitted. Also, a phase ramp or time-domain cyclic shift may be added to one or more of the packets after having undergone multiplication by one of the coefficients or factors within the sequence. | 11-28-2013 |
20130315323 | Traveling pilots within single user, multiple user, multiple access, and/or MIMO wireless communications - Pilot tones are included within symbols (e.g., orthogonal frequency division multiplexing (OFDM) symbols) transmitted between wireless communication devices. The pilot tones occupy fewer than all tone locations in any given symbol, and the pilot tones occupy different respective locations within different symbols. Generally, these traveling pilots are assigned to different respective tone locations in different symbols. In total, the pilot tones deed not cover every single tone location within the symbols used to convey information between devices. Considering for example, when pilots occupy fewer than all tone locations, even among multiple symbols, a device may perform interpolation to generate a pilot tone estimate corresponding to a tone location not occupied by pilot tone within any symbol. Also, power or magnitude of the pilot tones themselves may be boosted or amplified relative to power magnitude of other tones within such symbols. | 11-28-2013 |
20130336215 | Explicit feedback format within single user, multiple user, multiple access, and/or MIMO wireless communications - Explicit feedback format within single user, multiple user, multiple access, and/or MIMO wireless communications. A beamformer provides a first communication to a beamformee, and based thereon, the beamformee may ascertain certain characteristics associated with the type and format of feedback to be provided to the beamformee via a second communication from the beamformee to the beamformer. For example, the first communication may include indication of a current operational mode, such as whether it is in accordance with single-user multiple input multiple output (SU-MIMO) or multi-user multiple-input-multiple-output (MU-MIMO). Also, the first communication may indicate a requested steering matrix's rank to be employed in accordance with subsequent beamforming by the beamformer. Also, additional information such as that pertaining to per-tone SNR values for each respective space-time stream, per-tone or per-sub-band eigen-values, the particular channel width being employed (e.g., 20, 40, 80, or 160 MHz), etc. may be included within the second communication. | 12-19-2013 |
20140092882 | INTERCELL INTERFERENCE MITIGATION - Methods and apparatus are described for mitigating intercell interference in wireless communication systems utilizing substantially the same operating frequency band across multiple neighboring coverage areas. The operating frequency band may be shared across multiple neighboring or otherwise adjacent cells, such as in a frequency reuse one configuration. The wireless communication system can synchronize one or more resource allocation regions or zones across the multiple base stations, and can coordinate a permutation type within each resource allocation zone. The base stations can coordinate a pilot configuration in each of a plurality of coordinated resource allocation regions. Subscriber stations can be assigned resources in a coordinated resource allocation region based on interference levels. A subscriber station can determine a channel estimate for each of multiple base stations in the coordinated resource allocation region to mitigate interference. | 04-03-2014 |
20140161098 | ADVANCED TECHNOLOGY FRAME STRUCTURE WITH BACKWARD COMPATIBILITY - An advanced technology frame structure is described herein. The advanced technology frame structure can enhance a first technology frame structure in dimensions of time, frequency, or a combination of time and frequency. A second technology frame structure time division multiplexes second technology subframes with the first technology downlink and uplink subframes. The first technology downlink subframe can be divided into a first technology downlink subframe and one or more second technology downlink subframes. Similarly, the first technology uplink subframe can be divided into a first uplink subframe and one or more second technology uplink subframes. These principles can be expanded upon and can be applied in many communication systems. | 06-12-2014 |
20140198705 | Orthogonal frequency division multiple access (OFDMA) and duplication signaling within wireless communications - Communications are supported between wireless communication devices using OFDMA signaling and duplicate processing. An OFDMA frame, which includes first data intended for a first recipient device and second data intended for a second recipient device, is transmitted via a first sub-channel, and a duplicate of the OFDMA frame is transmitted via a second sub-channel. In some instances, additional duplicates of the OFDMA frame are transmitted via additional sub-channels. The OFDMA frame may be generated based on a first frequency and then down-clocked to a second frequency that corresponds to a bandwidth of one of the sub-channels. A wireless communication device configured to perform such operations may be compliant with one or more IEEE 802.11 communication standards, protocols, and/or recommended practices and may also be backward compatible with prior versions of IEEE 802.11. Different numbers of sub-channels and sub-channels of different bandwidths may be used to different times. | 07-17-2014 |
20140254510 | Clear channel assessment (CCA) levels within wireless communications - A wireless communication device is configured to perform clear channel assessment (CCA) using one or more CCA levels that are selected based on various criteria. The device receives or detects one or more packets on the communication medium, and the device then processes those one or more packets to determine status of one or more channels within one or more frequency bands using the one or more CCA levels. These CCA levels may be selected based on one or more parameters, and different CCA levels may be used at different times, for different channels, etc. Also, different CCA levels may be used to determine the status of different channels, different portions of the frequency spectrum, etc. When at least one channel is determined as being clear and available for usage, the device is configured to support communications with one or more other devices via one or more channels. | 09-11-2014 |
20140286203 | Channel sharing within wireless communications - A wireless communication device includes communication interface configured to receive and transmit signals and a processor configured to generate and process such signals. The communication interface of the wireless communication device is configured to receive a first signal from a first other wireless communication device, and the processor of the wireless communication device is configured to process the first signal to determine one or more concurrent transmission parameters. The processor of the wireless communication device is configured to generate the second signal based on the one or more concurrent transmission parameters and direct the communication interface to transmit the second signal to a second other wireless communication device during receipt of the first signal from the first other wireless communication device. The wireless communication device may be configured to make such concurrent transmissions based on one or more considerations such as the power level of the first signal. | 09-25-2014 |
20140286238 | Shared PLCP Protocol Data Unit (PPDU) within wireless communications - A wireless communication device is configured to generate frames based on any of a number of different frame formats for transmission to one or more other recipient wireless communication devices. The frame may be implemented to include data intended for two or more recipient devices. The device encodes first data intended for a first recipient device using first one or more coding parameters and encodes second data intended for a second recipient device using second one or more coding parameters. The manner by which the first and second data have been encoded is indicated within one or more other fields within the frames based on the selected frame format. In one example, a single preamble specifies the first and second one or more coding parameters. In another example, an initial preamble and one or more respective sub-preambles specify the first and second one or more coding parameters. | 09-25-2014 |
20140307653 | Multiple narrow bandwidth channel access and MAC operation within wireless communications - A wireless communication device is implemented to include a communication interface and a processor. The processor is configured to process communications associated with the other wireless communication devices within the wireless communication system to determine one or more traffic characteristics of those communications as well as one or more class characteristics of the other wireless communication devices. The processor is configured to classify the communications into one or more access categories based on the one or more traffic characteristics and is configured to classify the other devices into one or more device class categories based on the one or more class characteristics. The processor is then configured to generate one or more channel access control signals based on these classifications. The communication interface of the device is configured to transmit the one or more channel access control signals to one or more of the other devices. | 10-16-2014 |
20140362840 | Inter-AP coordination and synchronization within wireless communications - Coordination and synchronization is performed between two or more wireless network managers (e.g., access points (APs)). A first wireless network manager supports first communications with first other wireless communication devices, and a second wireless network manager supports second communications with those first and/or second other wirelessly case devices. The first and second wireless network managers also support communications with one another to coordinate the first and second communications supported with the first and/or second other wireless communication devices. Examples of coordination include selection of which other wireless communication devices are serviced or in communication with which of the first and second wireless network managers, selection of operational parameters (e.g., modulation coding set (MCS), beamforming, frequency band assignment, channel assignment, scheduling information, transmit power, etc.) for the first and second wireless communication devices, synchronization to a common clock (e.g., using timing synchronization function (TSF)). | 12-11-2014 |
20140362935 | Preamble with modified signal field (SIG) for use in wireless communications - A wireless communication device (‘device’) is configured to generate an OFDM/A packet that includes at least one OFDM/A symbol that includes at least one SIG having SIG information modulated on only even (or odd) sub-carriers and does not include any information modulated on odd (or even) sub-carriers of a set of OFDM/A sub-carriers. The set of OFDM/A sub-carriers may be all or less than all of available sub-carriers. The device may generate the packet to include a preamble and a payload such that the payload, which may be composed of at least one additional OFDM/A symbol, includes data modulated on some or all of the sub-carriers of the set of OFDM/A sub-carriers. The device can modulate and transmit SIG information and data differently within the preamble and the payload (e.g., with higher ordered modulation or MCS for the data and less power per sub-carrier than for the preamble). | 12-11-2014 |
20140369276 | Flexible OFDMA packet structure for wireless communications - A communication device includes a processor configured to generate OFDMA packets using various OFDMA packet structures and to transmit such OFDMA packets, via a communication interface, to at least one other communication device. The processor is also configured to receive, interpret, and process such OFDMA packets. One example of an OFDMA packet includes common SIG for two or more other wireless communication devices modulated across all sub-carriers of the OFDMA packet. The common SIG is followed by first SIG and first data for a first other wireless communication device modulated across first subset of the sub-carriers of the OFDMA packet and is also followed by second SIG and second data for a second other wireless communication device modulated across second subset of the sub-carriers of the OFDMA packet. Another example of an OFDMA packet includes the common SIG followed directly by first data and second data modulated as described above. | 12-18-2014 |
20140369333 | OFDMA communications for multiple capability wireless communication devices - A communication device's processor generates an OFDMA packet that includes different information for different recipient devices. The processor transmits, via a communication interface, different portions of the OFDMA packet via different channels. Initially, the processor transmits a first at least one field of the OFDMA packet intended for a first recipient device via the first channel. Then, the processor transmits a second at least one field of the OFDMA packet intended for the first recipient device via the first channel while simultaneously transmitting at least one other field of the OFDMA packet intended for a second recipient device via a second channel. This staggered transmission of different portions of the OFDMA packet via different channels allows a recipient device to classify different portions of the OFDMA packet and to determine which portions are intended for that recipient device. | 12-18-2014 |
20150023449 | Distributed signal fields (SIGs) for use in wireless communications - A wireless communication device includes a communication interface and a processor and is configured to generate a preamble of an OFDM packet that includes signal fields (SIGs) that specify first characteristics of a remainder of the OFDM packet that follows the SIG fields. A first at least one SIG includes information to specify second characteristics of a second at least one SIG that follows the first at least one SIG. The wireless communication device then transmits the OFDM packet to another wireless communication device. The second characteristics specifies any number of characteristics including any one or more of a size of a GI between the first at least one SIG and the second at least one SIG, a MCS used to generate the second at least one SIG, a length of the second at least one SIG, or a number of OFDM symbols of the second at least one SIG. | 01-22-2015 |