公开(公告)号：US08724720B2

公开(公告)日：2014-05-13

申请号：US12846681

申请日：2010-07-29

申请人： Sudhir Srinivasa ,  Hongyuan Zhang ,  Rohit U. Nabar

发明人： Sudhir Srinivasa ,  Hongyuan Zhang ,  Rohit U. Nabar

IPC分类号： H04L27/28

CPC分类号： H04L1/0005 ,  H04L1/0016 ,  H04L27/2607 ,  H04L27/2608 ,  H04L27/34 ,  H04W84/12

摘要： In a method for generating a physical layer (PHY) data unit for transmission via a communication channel, a first set of modulation coding schemes (MCSs) and a second set of MCSs that correspond to a number of spatial streams and a number of encoders are provided. The first set of MCSs correspond to a first channel bandwidth and the second set of MCSs correspond to a second channel bandwidth, and the first set of MCSs is different than the second set of MCSs. An MCS is selected from the first set of MCSs when the PHY data unit is to be transmitted using a channel having the first channel bandwidth, and the MCS is selected from the second set of MCSs when the PHY data unit is to be transmitted using a channel having the second channel bandwidth. Information bits are encoded using the number of encoders and according to the selected MCS, and the encoded information bits are parsed into the number of spatial streams. The encoded information bits are modulated according to the MCS, and a plurality of OFDM symbols are formed based on the modulated encoded information bits.

摘要翻译： 在用于生成经由通信信道进行传输的物理层（PHY）数据单元的方法中，与多个空间流和多个编码器相对应的第一组调制编码方案（MCS）和第二组MCS相对应， 提供。 第一组MCS对应于第一信道带宽，并且第二组MCS对应于第二信道带宽，并且第一组MCS不同于第二组MCS。 当要使用具有第一信道带宽的信道来发送PHY数据单元时，从第一组MCS中选择MCS，并且当使用第一组MCS发送PHY数据单元时，从第二组MCS中选择MCS 信道具有第二信道带宽。 使用编码器的数量并根据所选择的MCS对信息比特进行编码，并将编码的信息比特解析为空间流的数量。 编码信息比特根据MCS进行调制，并且基于调制编码信息比特形成多个OFDM符号。

公开(公告)号：US20130259017A1

公开(公告)日：2013-10-03

申请号：US13856277

申请日：2013-04-03

申请人： Hongyuan Zhang ,  Sudhir Srinivasa ,  Rohit U. Nabar ,  Raja Banerjea

发明人： Hongyuan Zhang ,  Sudhir Srinivasa ,  Rohit U. Nabar ,  Raja Banerjea

IPC分类号： H04W84/02

CPC分类号： H04L1/009 ,  H03M13/098 ,  H03M13/655 ,  H04L1/0041 ,  H04L1/0061 ,  H04L1/0072 ,  H04L1/0079 ,  H04L5/0007 ,  H04W84/02

摘要： In a method for generating a data unit conforming to a first communication protocol, a first field and a second field to be included in a preamble of the data unit are generated. The first field includes a first set of one or more information bits that indicate a duration of the data unit and is formatted such that the first field allows a receiver device that conforms to a second communication protocol to determine the duration of the data unit. The second field includes a second set of one or more information bits that indicate to a receiver device that conforms to the first communication protocol that the data unit conforms to the first communication protocol. The first field and the second field are modulated using a modulation scheme specified for a field corresponding to the first field and the second field, respectively, by the second communication protocol.

摘要翻译： 在用于生成符合第一通信协议的数据单元的方法中，生成要包括在数据单元的前导码中的第一字段和第二字段。 第一字段包括指示数据单元的持续时间并且被格式化的一个或多个信息比特的第一组，使得第一场允许符合第二通信协议的接收机设备确定数据单元的持续时间。 第二字段包括一个或多个信息比特的第二组，其向符合第一通信协议的接收机设备指示数据单元符合第一通信协议。 通过第二通信协议，分别使用针对对应于第一场和第二场的场指定的调制方案来调制第一场和第二场。

公开(公告)号：US20120201316A1

公开(公告)日：2012-08-09

申请号：US13366064

申请日：2012-02-03

申请人： Hongyuan Zhang ,  Rohit U. Nabar ,  Raja Banerjea ,  Yong Liu ,  Sudhir Srinivasa ,  Hyukjoon Kwon

发明人： Hongyuan Zhang ,  Rohit U. Nabar ,  Raja Banerjea ,  Yong Liu ,  Sudhir Srinivasa ,  Hyukjoon Kwon

IPC分类号： H04L27/28

CPC分类号： H04L27/2602 ,  H03M13/23 ,  H04L1/0046 ,  H04L1/0065 ,  H04L1/0072 ,  H04L1/08 ,  H04L27/2613 ,  H04L27/265

摘要： In a method for generating a physical layer (PHY) data unit for transmission via a communication channel, information bits to be included in the PHY data unit are encoded using a forward error correction (FEC) encoder. The information bits are mapped to a constellation symbols. Additionally, either the information bits are encoded according to a block coding scheme, or the constellation symbols are encoded according to the block coding scheme. Orthogonal frequency division multiplexing (OFDM) symbols are generated to include the constellation symbols and the PHY data unit is generated to include the OFDM symbols.

摘要翻译： 在通过通信信道生成用于发送的物理层（PHY）数据单元的方法中，使用前向纠错（FEC）编码器对要包括在PHY数据单元中的信息比特进行编码。 信息位被映射到星座符号。 另外，根据块编码方案对信息比特进行编码，或者根据块编码方案对星座符号进行编码。 生成正交频分复用（OFDM）符号以包括星座符号，并且生成PHY数据单元以包括OFDM符号。

公开(公告)号：US09209881B2

公开(公告)日：2015-12-08

申请号：US13161209

申请日：2011-06-15

申请人： Sudhir Srinivasa ,  Hongyuan Zhang ,  Rohit U. Nabar ,  Hyukjoon Kwon

发明人： Sudhir Srinivasa ,  Hongyuan Zhang ,  Rohit U. Nabar ,  Hyukjoon Kwon

IPC分类号： H04W16/12 ,  H04B7/06 ,  H04B7/04 ,  H04L25/02 ,  H04W72/04 ,  H04W48/16

CPC分类号： H04W72/0406 ,  H04B7/0434 ,  H04B7/0452 ,  H04B7/0617 ,  H04B7/0634 ,  H04L25/0204 ,  H04L25/0228 ,  H04L25/0242 ,  H04W48/16 ,  H04W72/046 ,  H04W72/082

摘要： A method in a communication network includes obtaining descriptions of a plurality of communication channels each communication channel associated with a different one of a plurality of receivers; and generating a plurality of steering vectors, one for each of the plurality of receivers, using the descriptions of the plurality of communication channels; wherein each steering vector is used to transmit data to a corresponding one of the plurality receivers via a plurality of antennas and over a corresponding one of the communication channels simultaneously and wherein each steering vector is used to communicate data on a different one of the plurality of communication channels, and wherein each steering vector is generated to reduce interference on a corresponding communication channel caused by simultaneous transmission of data on other communication channels.

摘要翻译： 通信网络中的方法包括：获得与多个接收机中的不同的一个相关联的每个通信信道的多个通信信道的描述; 以及使用所述多个通信信道的描述来生成多个所述多个接收机中的每一个的导向向量; 其中每个导向矢量用于经由多个天线以及通过相应的一个通信信道同时向多个接收机中的相应一个发送数据，并且其中每个导向向量用于在多个接收机中的不同的一个上传送数据 通信信道，并且其中生成每个导向矢量以减少由在其他通信信道上的数据的同时发送而引起的相应通信信道上的干扰。

公开(公告)号：US09021341B1

公开(公告)日：2015-04-28

申请号：US13159143

申请日：2011-06-13

申请人： Sudhir Srinivasa ,  Hongyuan Zhang ,  Rohit U. Nabar

发明人： Sudhir Srinivasa ,  Hongyuan Zhang ,  Rohit U. Nabar

IPC分类号： H03M13/00 ,  H04L1/00 ,  H03M13/09

CPC分类号： H04L1/0061 ,  H03M13/09 ,  H03M13/1102 ,  H03M13/23 ,  H03M13/618 ,  H03M13/6362 ,  H03M13/6513 ,  H03M13/6516 ,  H03M13/6527 ,  H04L1/0033 ,  H04L1/0057 ,  H04L1/0066 ,  H04L1/0075 ,  H04L1/0091 ,  H04L1/0625

摘要： In a method for generating a physical layer (PHY) data unit for transmission via a communication channel, a plurality of information bits to be included in the PHY data unit are received, and a number of orthogonal frequency division multiplexing (OFDM) symbols that are needed to include the plurality of information bits after encoding with a low density parity check (LDPC) encoder is determined. One or more of a, b, c, and d are performed according to a set of rules so that a receiving device can determine a number of information bits in the PHY data unit based on i) an indication of the number of OFDM symbols, and ii) the set rules: a) adding padding bits and/or shortening bits prior to encoding with the LDPC encoder, b) removing shortening bits after encoding with the LDPC encoder, c) removing parity bits after encoding with the LDPC encoder, d) repeating information and/or parity bits after encoding with the LDPC encoder. The plurality of information bits are encoded using the LDPC encoder. The PHY data unit is generated i) to include the LDPC encoded information bits in OFDM symbols and ii) to include an indication of the number of OFDM symbols in the PHY data unit.

摘要翻译： 在用于生成经由通信信道传输的物理层（PHY）数据单元的方法中，接收要包括在PHY数据单元中的多个信息比特，以及多个正交频分复用（OFDM）符号， 需要在用低密度奇偶校验（LDPC）编码器编码之后包括多个信息比特。 根据一组规则执行a，b，c和d中的一个或多个，使得接收设备可以基于i）OFDM符号的数量的指示来确定PHY数据单元中的多个信息比特， 和ii）设置规则：a）在用LDPC编码器进行编码之前，添加填充比特和/或缩短比特，b）在用LDPC编码器进行编码之后，去除缩短比特，c）在用LDPC编码器编码之后去除奇偶校验位，d ）在用LDPC编码器编码之后重复信息和/或奇偶校验位。 使用LDPC编码器对多个信息比特进行编码。 生成PHY数据单元i）在OFDM符号中包含LDPC编码信息比特，以及ii）包括PHY数据单元中的OFDM符号数量的指示。

公开(公告)号：US08941538B1

公开(公告)日：2015-01-27

申请号：US13463859

申请日：2012-05-04

申请人： Rohit U. Nabar ,  Hongyuan Zhang ,  Sudhir Srinivasa

发明人： Rohit U. Nabar ,  Hongyuan Zhang ,  Sudhir Srinivasa

IPC分类号： H01Q3/00 ,  H04B7/06

CPC分类号： H01Q3/00 ,  H04B7/0617 ,  H04B7/0626 ,  H04B7/0634

摘要： Systems and methods are provided for directing radiated energy from a transmitting device towards a receiving device using multiple antennas. Channel weights, representing signal attenuation and a phase rotation induced by a transmission medium, are determined at a transmitting device. A set of steering weights are determined based on applying an iterative linear transform to an initial value of the steering weights, where the linear transform depends on the determined channel weights. A final value of the steering weights is applied to an input signal to produce a transmit signal, and the transmit signal is transmitted using multiple antennas.

摘要翻译： 提供了系统和方法，用于使用多个天线将辐射能量从发射设备引导到接收设备。 在发送设备处确定表示信号衰减和由传输介质引起的相位旋转的信道权重。 基于将迭代线性变换应用于转向权重的初始值来确定一组转向权重，其中线性变换取决于确定的信道权重。 将转向权重的最终值应用于输入信号以产生发送信号，并且使用多个天线发送发送信号。

公开(公告)号：US08891640B2

公开(公告)日：2014-11-18

申请号：US13491541

申请日：2012-06-07

申请人： Rohit U. Nabar ,  Hongyuan Zhang ,  Sudhir Srinivasa ,  Xiayu Zheng

发明人： Rohit U. Nabar ,  Hongyuan Zhang ,  Sudhir Srinivasa ,  Xiayu Zheng

IPC分类号： H04K1/10 ,  H04L27/28 ,  H04B7/06

CPC分类号： H04B7/0417 ,  H04B7/0617 ,  H04B7/0619 ,  H04B7/0626 ,  H04B7/063 ,  H04B7/0632 ,  H04B7/0634

摘要： In a method for beamforming in a multiple input multiple output (MIMO) communication system, a data unit is received from a communication device via a MIMO communication channel, and it is determined whether the data unit satisfies one or more selection criteria. Further, when it is determined that the data unit satisfies the one or more selection criteria, the data unit is selected to be used in developing a steering matrix for transmitting data units to the communication device.

摘要翻译： 在多输入多输出（MIMO）通信系统中的波束形成方法中，经由MIMO通信信道从通信设备接收数据单元，并且确定数据单元是否满足一个或多个选择标准。 此外，当确定数据单元满足一个或多个选择标准时，数据单元被选择用于开发用于向通信设备发送数据单元的导向矩阵。

公开(公告)号：US08462863B1

公开(公告)日：2013-06-11

申请号：US12841772

申请日：2010-07-22

申请人： Hongyuan Zhang ,  Rohit U. Nabar ,  Sudhir Srinivasa

发明人： Hongyuan Zhang ,  Rohit U. Nabar ,  Sudhir Srinivasa

IPC分类号： H04K1/10

CPC分类号： H04L27/2602 ,  H04L27/2613

摘要： In a method for generating a single data unit for transmission via a communication channel, a preamble and a first portion of a data payload of the single data unit are generated. A midamble is generated, the midamble including at least one OFDM (Orthogonal Frequency Division Multiplexing) symbol that includes calibration information. A second portion of the data payload of the single data unit is generated, and the midamble is included between the first portion of the data payload and the second portion of the data payload.

摘要翻译： 在用于生成用于经由通信信道传输的单个数据单元的方法中，生成单个数据单元的数据有效载荷的前导码和第一部分。 生成中间码，中间码包括至少一个包括校准信息的OFDM（正交频分复用）符号。 产生单个数据单元的数据有效载荷的第二部分，并且中间码被包括在数据有效载荷的第一部分和数据有效载荷的第二部分之间。

公开(公告)号：US08442141B1

公开(公告)日：2013-05-14

申请号：US12751484

申请日：2010-03-31

申请人： Hongyuan Zhang ,  Sudhir Srinivasa ,  Rohit U. Nabar

发明人： Hongyuan Zhang ,  Sudhir Srinivasa ,  Rohit U. Nabar

IPC分类号： H04B7/02 ,  H04L1/02

CPC分类号： H04B7/043 ,  H04B7/0417 ,  H04L1/06

摘要： A method for processing a preamble of a data unit transmitted via a communication channel includes receiving a signal via a plurality of antennas, applying a plurality of distinct steering vectors to the received signal to generate a plurality of respective outputs, and using the plurality of outputs to perform at least one of carrier sensing and symbol timing synchronization associated with the preamble.

公开(公告)号：US20110310827A1

公开(公告)日：2011-12-22

申请号：US13161209

申请日：2011-06-15

申请人： Sudhir Srinivasa ,  Hongyuan Zhang ,  Rohit U. Nabar ,  Hyukjoon Kwon

发明人： Sudhir Srinivasa ,  Hongyuan Zhang ,  Rohit U. Nabar ,  Hyukjoon Kwon

IPC分类号： H04W16/12 ,  H04W72/04

CPC分类号： H04W72/0406 ,  H04B7/0434 ,  H04B7/0452 ,  H04B7/0617 ,  H04B7/0634 ,  H04L25/0204 ,  H04L25/0228 ,  H04L25/0242 ,  H04W48/16 ,  H04W72/046 ,  H04W72/082

摘要： A method in a communication network includes obtaining descriptions of a plurality of communication channels each communication channel associated with a different one of a plurality of receivers; and generating a plurality of steering vectors, one for each of the plurality of receivers, using the descriptions of the plurality of communication channels; wherein each steering vector is used to transmit data to a corresponding one of the plurality receivers via a plurality of antennas and over a corresponding one of the communication channels simultaneously and wherein each steering vector is used to communicate data on a different one of the plurality of communication channels, and wherein each steering vector is generated to reduce interference on a corresponding communication channel caused by simultaneous transmission of data on other communication channels.

摘要翻译： 通信网络中的方法包括：获得与多个接收机中的不同的一个相关联的每个通信信道的多个通信信道的描述; 以及使用所述多个通信信道的描述来生成多个所述多个接收机中的每一个的导向向量; 其中每个导向矢量用于经由多个天线以及通过相应的一个通信信道同时向多个接收机中的相应一个发送数据，并且其中每个导向向量用于在多个接收机中的不同的一个上传送数据 通信信道，并且其中生成每个导向矢量以减少由在其他通信信道上的数据的同时发送而引起的相应通信信道上的干扰。