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31. 发明申请

US20120320889A1 LOW BANDWIDTH PHY FOR WLAN 有权
标题翻译： WLAN的低带宽PHY
公开(公告)号：US20120320889A1
公开(公告)日：2012-12-20
申请号：US13494515
申请日：2012-06-12
申请人： Hongyuan Zhang , Raja Banerjea , Sudhir Srinivasa
发明人： Hongyuan Zhang , Raja Banerjea , Sudhir Srinivasa
IPC分类号： H04W84/12
CPC分类号： H04L1/004 , H04L1/0025 , H04L1/0043 , H04L1/0057 , H04L1/0061 , H04L1/08 , H04L7/048 , H04L27/2602 , H04L27/2613
摘要： A method includes generating first and second preambles for first and second data units corresponding to first and second PHY modes, respectively. Generating the first preamble includes generating a first STF, LTF, and SIG field. The first SIG field includes an OFDM symbol modulated according to a first modulation technique. The OFDM symbol begins a first time interval, and ends a second time interval, after the first LTF begins. Generating the second preamble includes generating a second STF and LTF. The second STF has a greater duration, and different repeating sequence, than the first STF. The second LTF includes a second OFDM symbol modulated according to a second modulation technique, and at least partially occupying a location beginning a third time interval, and ending a fourth time interval, after the second LTF begins. The third and fourth time intervals are equal to the first and second time intervals, respectively.
摘要翻译：一种方法包括分别为对应于第一和第二PHY模式的第一和第二数据单元生成第一和第二前导码。生成第一前同步码包括生成第一STF，LTF和SIG字段。第一SIG字段包括根据第一调制技术调制的OFDM符号。 OFDM符号开始第一时间间隔，并且在第一LTF开始之后结束第二时间间隔。生成第二前导码包括生成第二STF和LTF。第二STF具有比第一STF更长的持续时间和不同的重复序列。第二LTF包括根据第二调制技术调制的第二OFDM符号，并且至少部分地占据从第三时间间隔开始的位置，并且在第二LTF开始之后结束第四时间间隔。第三和第四时间间隔分别等于第一和第二时间间隔。

32. 发明申请

US20120201315A1 Control Mode PHY for WLAN 有权
标题翻译： WLAN的控制模式PHY
公开(公告)号：US20120201315A1
公开(公告)日：2012-08-09
申请号：US13366038
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： H04L27/00 , H04W84/02 , H04L27/28
CPC分类号： H04L27/2602 , H03M13/23 , H04L1/0046 , H04L1/0065 , H04L1/0072 , H04L1/08 , H04L27/2613 , H04L27/265
摘要： A first preamble for a first data unit includes a first long training field and a first signal field modulated according to a first technique. The first data unit is generated according to a first data unit format and includes the first preamble. A second preamble, generated for a second data unit, includes a second signal field and a second long training field. Information in the second signal field is repeated and/or the second long training field is generated so that a duration of the second long training field is longer than a duration of the first long training field. A portion of the second signal field is modulated according to a second technique or a portion of the second long training field is modulated according to the second technique to signal to a receiver that the second data unit is formatted according to a second data unit format.
摘要翻译：第一数据单元的第一前同步码包括第一长训练场和根据第一技术调制的第一信号场。第一数据单元根据第一数据单元格式生成并包括第一前导码。为第二数据单元生成的第二前导码包括第二信号字段和第二长训练字段。重复第二信号字段中的信息和/或生成第二长训练场，使得第二长训练场的持续时间长于第一长训练场的持续时间。根据第二技术调制第二信号场的一部分，或根据第二技术对第二长训练场的一部分进行调制，以向接收机发信号，根据第二数据单元格式对第二数据单元进行格式化。

33. 发明授权

US08179315B1 Iterative technique for fast computation of TxBF steering weights 有权
标题翻译：用于快速计算TxBF转向重量的迭代技术
公开(公告)号：US08179315B1
公开(公告)日：2012-05-15
申请号：US12903523
申请日：2010-10-13
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
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。

34. 发明申请

US20120087426A1 COMPRESSED FEEDBACK FORMAT FOR WLAN 有权
标题翻译：压缩反馈格式的WLAN
公开(公告)号：US20120087426A1
公开(公告)日：2012-04-12
申请号：US13252710
申请日：2011-10-04
申请人： Hongyuan Zhang , Sudhir Srinivasa , Hyukjoon Kwon , Raja Banerjea
发明人： Hongyuan Zhang , Sudhir Srinivasa , Hyukjoon Kwon , Raja Banerjea
IPC分类号： H04L27/28
CPC分类号： H04L27/2646 , H04B7/0617 , H04B7/066 , H04L1/06 , H04L1/0618 , H04L1/0693 , H04L5/0023 , H04L5/0053 , H04L5/0057 , H04L25/0204 , H04L25/03343 , H04L2025/03414 , H04L2025/03426 , H04L2025/03808 , H04W24/10
摘要： In a method for transmitting channel feedback data from a receiver to a transmitter, channel data for a plurality of orthogonal frequency division multiplexing (OFDM) tones for one or more spatial streams corresponding to a communication channel is determined. A plurality of angle values associated with the one or more spatial streams and one or more OFDM tones is determined. For each of the one or more spatial streams, a per-tone signal to noise ratio (PT-SNR) associated with one or more OFDM tones is determined, and an average signal to noise ratio (avg-SNR) is determined by averaging the signal to noise ratio (SNR) values. A feedback report is generated to include at least i) the plurality of angle values, ii) the PT-SNRs, and iii) the avg-SNR. The feedback report is included in a data unit to be transmitted from the receiver to the transmitter.
摘要翻译：在从接收机向发射机发送信道反馈数据的方法中，确定用于与通信信道对应的一个或多个空间流的多个正交频分复用（OFDM）音调的信道数据。确定与一个或多个空间流和一个或多个OFDM音调相关联的多个角度值。对于一个或多个空间流中的每一个，确定与一个或多个OFDM音调相关联的每音调信噪比（PT-SNR），并且通过将平均信噪比（avg-SNR）平均化来确定平均信噪比信噪比（SNR）值。生成反馈报告至少包括i）多个角度值，ii）PT-SNR，以及iii）平均SNR。反馈报告被包括在要从接收机发射到发射机的数据单元中。

35. 发明申请

US20120002756A1 Modulation of Signal Field in a WLAN Frame Header 有权
标题翻译： WLAN帧头中信号域的调制
公开(公告)号：US20120002756A1
公开(公告)日：2012-01-05
申请号：US13174186
申请日：2011-06-30
申请人： Hongyuan Zhang , Sudhir Srinivasa
发明人： Hongyuan Zhang , Sudhir Srinivasa
IPC分类号： H04L27/20 , H04L27/00
CPC分类号： H04L27/2602 , H04B7/028 , H04L5/0048 , H04L27/20 , H04L69/22 , H04L69/323
摘要： A plurality of training fields of a preamble of a physical layer data unit are generated, and training fields of the plurality of training fields are mapped to respective signal streams of a plurality of streams using a mapping matrix. A signal field of the preamble of the data unit is generated, and the signal field is mapped to the plurality of signal streams using a column of the mapping matrix. The plurality of signal streams are mapped to a plurality of spatial streams, and at least i) the plurality of training fields and ii) the signal field are transmitted via the plurality of spatial streams.
摘要翻译：生成物理层数据单元的前导码的多个训练场，并且使用映射矩阵将多个训练场的训练场映射到多个流的各个信号流。产生数据单元的前导码的信号字段，并且使用映射矩阵的列将信号字段映射到多个信号流。多个信号流被映射到多个空间流，并且至少i）多个训练场，以及ii）信号场经由多个空间流发射。

36. 发明申请

US20110128947A1 Method and Apparatus for Sounding Multiple Stations 有权
标题翻译：多站监测方法与装置
公开(公告)号：US20110128947A1
公开(公告)日：2011-06-02
申请号：US12959079
申请日：2010-12-02
申请人： Yong Liu , Hongyuan Zhang , Raja Banerjea , Harish Ramamurthy , Sudhir Srinivasa
发明人： Yong Liu , Hongyuan Zhang , Raja Banerjea , Harish Ramamurthy , Sudhir Srinivasa
IPC分类号： H04W84/12
CPC分类号： H04L25/03343 , H04L25/0204 , H04L25/0228 , H04L2025/03426 , H04L2025/03802
摘要： A plurality of stations to provide sounding feedback in response to a training signal sequence is determined, and a communication frame is generated that includes i) an indication of a request for the plurality of stations to provide sounding feedback corresponding to the training signal sequence, and ii) information indicative of when each of the plurality of stations should transmit sounding feedback, and iii) sounding feedback parameters. The communication frame is transmitted along with the training sequence.
摘要翻译：确定响应于训练信号序列提供探测反馈的多个站，并且生成通信帧，该通信帧包括i）对多个站提供对应于训练信号序列的探测反馈的请求的指示，以及 ii）指示多个站中的每个站应何时发送探测反馈的信息，以及iii）发声反馈参数。通信帧与训练序列一起传输。

37. 发明申请

US20100260159A1 PHYSICAL LAYER FRAME FORMAT FOR WLAN 有权
标题翻译： WLAN的物理层框架格式
公开(公告)号：US20100260159A1
公开(公告)日：2010-10-14
申请号：US12758603
申请日：2010-04-12
申请人： Hongyuan Zhang , Hui-Ling Lou , Rohit U. Nabar , Sudhir Srinivasa , Mao Yu , Raja Banerjea
发明人： Hongyuan Zhang , Hui-Ling Lou , Rohit U. Nabar , Sudhir Srinivasa , Mao Yu , Raja Banerjea
IPC分类号： H04W4/00
CPC分类号： H04L1/0079 , H04L1/0072 , H04L1/009 , H04L27/2613 , H04L69/18 , H04W28/06 , H04W84/12 , H04W99/00
摘要： In a method for generating a data unit for transmission via a communication channel, wherein the data unit conforms to a first communication protocol, a preamble of the data unit is generated. The preamble includes a first field having information that indicates a duration of the data unit, the first field being formatted such that the first field is decodable by a receiver device that conforms to a second communication protocol but does not conform to the first communication protocol to determine the duration of the data unit based on the first field. Additionally, the preamble is formatted such that a portion of the preamble is decodable by a receiver device that conforms to a third communication protocol but does not conform to the first communication protocol. Also, the preamble is formatted such that a receiver device that conforms to the first communication protocol can determine that the data unit conforms to the first communication protocol. A data portion of the data unit that conforms to the first communication protocol and does not conform to either (i) the second communication protocol or (ii) the third communication protocol is generated.
摘要翻译：在通过通信信道生成用于发送的数据单元的方法中，其中数据单元符合第一通信协议，生成数据单元的前同步码。前导码包括具有指示数据单元的持续时间的信息的第一字段，第一字段被格式化，使得第一字段可由符合第二通信协议但不符合第一通信协议的接收机设备解码，基于第一个字段确定数据单元的持续时间。另外，前导码被格式化，使得前导码的一部分可以由符合第三通信协议但不符合第一通信协议的接收机设备解码。此外，前导码格式化使得符合第一通信协议的接收机设备可以确定数据单元符合第一通信协议。产生符合第一通信协议并且不符合（i）第二通信协议或（ii）第三通信协议的数据单元的数据部分。

38. 发明授权

US09209881B2 Alternate feedback types for downlink multiple user MIMO configurations 有权
标题翻译：用于下行链路多用户MIMO配置的备用反馈类型
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。

39. 发明授权

US09025681B2 Modulation of signal field in a WLAN frame header 有权
标题翻译： WLAN帧头中信号字段的调制
公开(公告)号：US09025681B2
公开(公告)日：2015-05-05
申请号：US13174186
申请日：2011-06-30
申请人： Hongyuan Zhang , Sudhir Srinivasa
发明人： Hongyuan Zhang , Sudhir Srinivasa
IPC分类号： H04K1/10 , H04L27/28 , H04L5/00
CPC分类号： H04L27/2602 , H04B7/028 , H04L5/0048 , H04L27/20 , H04L69/22 , H04L69/323
摘要： A plurality of training fields of a preamble of a physical layer data unit are generated, and training fields of the plurality of training fields are mapped to respective signal streams of a plurality of streams using a mapping matrix. A signal field of the preamble of the data unit is generated, and the signal field is mapped to the plurality of signal streams using a column of the mapping matrix. The plurality of signal streams are mapped to a plurality of spatial streams, and at least i) the plurality of training fields and ii) the signal field are transmitted via the plurality of spatial streams.
摘要翻译：生成物理层数据单元的前导码的多个训练场，并且使用映射矩阵将多个训练场的训练场映射到多个流的各个信号流。产生数据单元的前导码的信号字段，并且使用映射矩阵的列将信号字段映射到多个信号流。多个信号流被映射到多个空间流，并且至少i）多个训练场，以及ii）信号场经由多个空间流发射。

40. 发明授权

US09021341B1 LDPC coding in a communication system 有权
标题翻译：通信系统中的LDPC编码
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。

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