-
公开(公告)号：US11374683B1
公开(公告)日：2022-06-28
申请号：US16703352
申请日：2019-12-04
发明人： B Hari Ram , Vijay Ahirwar , Sri Varsha Rottela , Hongyuan Zhang , Sudhir Srinivasa , Nilesh Khude
摘要： A communication device generates a legacy portion of a physical layer (PHY) preamble of a PHY data unit. The legacy portion includes a plurality of legacy training fields and a legacy signal field that indicates a duration of the PHY data unit. The communication device generates a non-legacy portion of the PHY preamble to include a multi-bit signal field header to indicate a packet type of the PHY data unit from among a plurality of packet types defined by a wireless communication protocol, the plurality of packet types corresponding to a plurality of non-legacy signal field formats. The communication device generates a non-legacy portion of the PHY preamble to also include a non-legacy signal field having a field format i) selected from the plurality of non-legacy signal field formats and ii) consistent with the packet type indicated by the multi-bit signal field header.
-
公开(公告)号：US10574393B1
公开(公告)日：2020-02-25
申请号：US16045491
申请日：2018-07-25
发明人： Vijay Ganwani , Ankit Sethi , Sudhir Srinivasa , Sih-Yu Lin , Yui Lin
摘要： The present disclosure describes methods and apparatuses for phase-based cyclic redundancy check (CRC) verification for wireless communication. In some aspects, a soft phase value and a sliced phase value are received for a symbol of a data packet, the data packet received via a wireless interface. An error measurement is determined for the symbol based on the soft phase value and the sliced phase value. The error measurement for the symbol is then compared to an error measurement threshold for detecting symbol-level errors in the data packet. Based on the error measurement exceeding an error measurement threshold, a bit error can be detected in the data packet, which may have passed CRC. By detecting the bit error despite a CRC pass, the bit error can be indicated to higher-level entity of the wireless interface. This can be effective to prevent the bit error from impairing operation of the higher-level entity.
-
公开(公告)号：US10547487B1
公开(公告)日：2020-01-28
申请号：US15627163
申请日：2017-06-19
发明人： Yan Zhang , Hongyuan Zhang , Sudhir Srinivasa
摘要： The present disclosure includes systems and techniques relating to an integer non-uniform constellation (NUC) high-order M-QAM. In some implementations, M is no less than 1024. Each of M constellation points of the integer NUC M-QAM has respective integer real and imaginary coordinates. A bit pattern is received and mapped to integer real and imaginary coordinates of one of the M constellation points according to a mapping rule of the integer NUC M-QAM. A transmission signal is modulated in accordance with the integer real and imaginary coordinates of the one of the M constellation points of the integer NUC M-QAM.
-
公开(公告)号：US09910129B1
公开(公告)日：2018-03-06
申请号：US14489678
申请日：2014-09-18
CPC分类号： G01S5/021 , H04L43/0864 , H04L43/50
摘要： A method of calibrating analog transceiver delay includes generating a signal in a portion of a first device to arrive at a first known time at analog transmit circuitry of the first device, transmitting the signal from the analog transmit circuitry of the first device, receiving the transmitted signal, and deriving transceiver delay from the received signal. The transmitting may be performed via a closed loop to analog receiver circuitry of the first device, detecting the signal at a second known time at an output of the analog receiver circuitry of the first device. The transmitting also may be performed wirelessly to receiver circuitry of a second device placed at a predetermined distance from the first device, detecting the received signal at a second known time at the receiver circuitry of the second device. Transceiver delay can be determined from transit time and apportioned between transmit delay and receive delay.
-
公开(公告)号：US09843097B1
公开(公告)日：2017-12-12
申请号：US14325027
申请日：2014-07-07
发明人： Hongyuan Zhang , Sudhir Srinivasa
CPC分类号： H04B7/0421 , H04B7/0617 , H04B7/0626 , H04B17/11 , H04L1/1607 , H04L5/0023 , H04L5/0048 , H04L5/0064 , H04L27/2613
摘要： In a method for beamforming in a multiple input multiple output (MIMO) communication system, a data unit from a second communication device is received at a first communication device via a MIMO communication channel. Training signals in the data unit are buffered in a memory of the first communication device, wherein buffering assumes that the data unit spans a bandwidth greater than a maximum bandwidth of a legacy first communication protocol. The first communication device determines whether the data unit is formatted according to a duplication mode in which a bandwidth portion of the data unit conforms to the legacy first communication protocol. If it is determined that the data unit is formatted according to the duplication mode, the first communication device utilizes a transmit beamforming matrix generated using the training signals buffered assuming that the data unit spans the bandwidth greater than the maximum bandwidth of the legacy first communication protocol.
-
公开(公告)号：US09614707B1
公开(公告)日：2017-04-04
申请号：US15005150
申请日：2016-01-25
发明人： Hongyuan Zhang , Rohit U. Nabar , Sudhir Srinivasa
CPC分类号： H04L27/2602 , H04B7/0684 , H04L1/0625 , H04L1/0675 , H04L25/0204 , H04L25/0224 , H04W28/0263 , H04W72/04 , H04W72/1263 , H04W84/12
摘要： In generating a data unit for transmission via a communication channel, a preamble of the data unit is generated, including i) generating a set of training fields, and ii) mapping each training field in the set of training fields to a plurality of space-time streams. When the set of training fields consist of four training fields, each training field in the set of training fields is mapped to four space-time streams according to a first space-time stream mapping matrix. When the set of training fields consists of six training fields, each training field in the set of training fields is mapped to six space-time streams according to a second space-time stream mapping matrix, wherein the first space-time stream mapping matrix is not a submatrix of the second space-time stream mapping matrix. A data portion of the data unit is generated so that a receiver device can receive the data portion via a corresponding number of space-time streams using channel information derived from the set of training fields.
-
7.发明授权Calibration correction for implicit beamformer using an explicit beamforming technique in a wireless MIMO communication system 有权在无线MIMO通信系统中使用显式波束成形技术的隐式波束形成器的校准校正公开(公告)号：US09444577B1
公开(公告)日：2016-09-13
申请号：US14190988
申请日：2014-02-26
发明人： Hongyuan Zhang , Rohit U. Nabar , Sudhir Srinivasa
CPC分类号： H04L1/0026 , H04B7/0413 , H04B7/0617 , H04B7/0619 , H04B7/0667 , H04B7/068 , H04L1/16 , H04L25/0206 , H04L25/03 , H04L25/03949
摘要： A bi-directionally calibrated beamforming technique for use in a MIMO wireless communication system includes a transmitter communicating a calibration initiation signal to a receiver requesting the receiver send a non-sounding packet containing an estimated description of the forward channel. The receiver also sends a sounding packet to the transmitter. The transmitter determining a partial or full estimated description of a reverse channel based on the received non-sounding packet and/or the receiving sounding packet. The transmitter further determines one or more transmitter correction matrices from receiving estimated description of the forward channel and the partial or full estimated description of the reverse channel. The transmitter sending the partial or full estimated description of the reverse channel to the receiver, which determines one or more receiver correction matrices.
摘要翻译： 在MIMO无线通信系统中使用的双向校准波束成形技术包括将校准启动信号传送到接收机的发射机，该接收机请求接收机发送包含前向信道估计描述的非发声分组。 接收机还向发射机发送一个探测包。 所述发射机基于所接收到的非探测分组和/或接收探测分组来确定反向信道的部分或全部估计描述。 发射机进一步确定一个或多个发射机校正矩阵从接收正向信道的估计描述和反向信道的部分或全部估计描述。 发射机向接收机发送反向信道的部分或全部估计描述，其确定一个或多个接收机校正矩阵。
-
公开(公告)号：US09319904B1
公开(公告)日：2016-04-19
申请号：US14875305
申请日：2015-10-05
发明人： Sudhir Srinivasa , Xiayu Zheng , Hongyuan Zhang , Rohit U. Nabar , Riddhi Madani , Atul Salhotra , Erik Heinke , Brian Bosso
CPC分类号： H04W24/00 , H04B17/14 , H04L43/0852
摘要： A first sounding packet is transmitted from the wireless communication device to a calibration station. A first channel descriptor is generated based on the first sounding packet. A second sounding packet is transmitted from the calibration station to the wireless communication device. A second channel descriptor is generated based on the second sounding packet. The first channel descriptor and the second channel descriptor are obtained at a processor device. Calibration coefficients indicative of one or both of phase imbalance and amplitude imbalance between a receive radio frequency (RF) chain and a transmit RF chain at the wireless communication device are generated based on the first and the second channel descriptors. The calibration coefficients are sent from the processor device to the wireless communication device.
摘要翻译： 第一探测包从无线通信设备发送到校准站。 基于第一探测包生成第一信道描述符。 第二探测包从校准站发送到无线通信设备。 基于第二探测包生成第二信道描述符。 在处理器设备处获得第一信道描述符和第二信道描述符。 基于第一和第二信道描述符生成指示无线通信设备处的接收射频（RF）链和发射RF链之间的相位不平衡和幅度不平衡之一或两者的校准系数。 校准系数从处理器设备发送到无线通信设备。
-
9.发明授权Method and apparatus for determining a location of a network device in a wireless network 有权用于确定无线网络中的网络设备的位置的方法和装置公开(公告)号：US09237546B1
公开(公告)日：2016-01-12
申请号：US14509800
申请日：2014-10-08
发明人： Hongyuan Zhang , Liwen Chu , Sudhir Srinivasa
摘要： In a wireless network, a first access point includes a transmitter to transmit a first frame to a first device and a receiver to receive a second frame from the first device. The first and second frames are also received by second and third devices, which are separated from the first access point by predetermined distances. A timing module generates timing information including times of departure and arrival of the first and second frames at the first access point. At the first access point, a feedback module receives feedback information from the second and third devices including times of arrival of the first and second frames at the second and third devices, and a location determining module determines a location of the first device based on the timing and feedback information and predetermined locations of the first access point and the second and third devices in the wireless network.
摘要翻译： 在无线网络中，第一接入点包括将第一帧发送到第一设备的发射机和从第一设备接收第二帧的接收机。 第一和第二帧也由第二和第三设备接收，第二和第三设备与第一接入点分开预定的距离。 定时模块产生包括第一和第二帧在第一接入点的出发和到达时间的定时信息。 在第一接入点，反馈模块从第二和第三设备接收包括第二和第三设备的第一和第二帧的到达时间的反馈信息，并且位置确定模块基于第一和第三设备确定第一设备的位置 定时和反馈信息以及无线网络中的第一接入点和第二和第三设备的预定位置。
-
10.发明授权公开(公告)号：US08953720B1
公开(公告)日：2015-02-10
申请号：US13747059
申请日：2013-01-22
CPC分类号： H04L27/2613 , H04L25/022 , H04L25/0256 , H04L27/0012 , H04L27/2035 , H04L27/206 , H04L27/2656 , H04L27/2666 , H04L27/2672 , H04L27/2682
摘要： In a method for detecting a packet type of an orthogonal frequency division multiplexing (OFDM) data unit detected in a communication channel, a first estimate and a second estimate of a transmitted symbol are determined for each of at least some of a plurality of OFDM tones in an OFDM symbol of the data unit. A first distance and a second distance are determined between a received symbol and, respectively, the first estimate and the second estimate scaled by a channel response estimate corresponding to the OFDM tone. A first total distance is determined based on a mathematical summation of the first distances over the plurality of OFDM tones. A second total distance is determined based on a mathematical summation of the second distances over the plurality of OFDM tones. The packet type is determined based at least on the first total distance and the second total distance.
摘要翻译： 在用于检测在通信信道中检测到的正交频分复用（OFDM）数据单元的分组类型的方法中，针对多个OFDM音调中的至少一些OFDM音调中的每一个确定发送符号的第一估计和第二估计 在数据单元的OFDM符号中。 第一距离和第二距离在接收到的符号和分别由与OFDM音调对应的信道响应估计量化的第一估计和第二估计之间确定。 基于多个OFDM音调上的第一距离的数学求和来确定第一总距离。 基于多个OFDM音调上的第二距离的数学求和来确定第二总距离。 至少基于第一总距离和第二总距离来确定分组类型。
-
-
-
-
-
-
-
-
-
搜索结果
55 条记录 (耗时 0.061 秒)
