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41. 发明授权

US08599803B1 Open loop multiple access for WLAN 有权
公开(公告)号：US08599803B1
公开(公告)日：2013-12-03
申请号：US12772783
申请日：2010-05-03
申请人： Hongyuan Zhang , Rohit U. Nabar , Hui-Ling Lou , Sudhir Srinivasa , Arul Durai Murugan Palanivelu
发明人： Hongyuan Zhang , Rohit U. Nabar , Hui-Ling Lou , Sudhir Srinivasa , Arul Durai Murugan Palanivelu
IPC分类号： H04Q7/24
CPC分类号： H04W84/02 , H04J11/00 , H04L1/0643 , H04L27/2626
摘要： In a method for transmitting information in a wireless local area network (WLAN), a plurality of different data streams corresponding to a plurality of different devices are orthogonally multiplexed onto a single symbol stream without using channel state information corresponding to a plurality of channels between a transmitting device and the plurality of different devices. One or more transmit streams are generated using the single symbol stream.

42. 发明申请

US20120087436A1 TONE REORDERING IN A WIRELESS COMMUNICATION SYSTEM 有权
标题翻译：无线通信系统中的音调
公开(公告)号：US20120087436A1
公开(公告)日：2012-04-12
申请号：US13250661
申请日：2011-09-30
申请人： Sudhir Srinivasa , Hongyuan Zhang
发明人： Sudhir Srinivasa , Hongyuan Zhang
IPC分类号： H04L27/00
CPC分类号： H04L5/0044 , H04L1/0057 , H04L1/0059 , H04L5/0023
摘要： In a method for generating an orthogonal frequency division multiplexing (OFDM) symbol to be included in a PHY data unit for transmission via a communication channel, wherein the OFDM symbol includes a plurality of OFDM tones, information bits to be included in the OFDM symbol are encoded to generate encoded information bits. The encoded information bits are parsed into a plurality of spatial streams. The spatial streams, or space-time streams generated from the spatial streams, are mapped to transmit chains using a plurality of spatial mapping matrices corresponding to the plurality of OFDM tones. Additionally, one of i) reordering OFDM tones before spatial mapping is applied, or ii) reordering OFDM tones after spatial stream mapping is applied and reordering spatial mapping matrices to match the reordered OFDM tones is performed. The OFDM symbol to be included in the PHY data unit is generated.
摘要翻译：在用于生成要包括在PHY数据单元中以用于经由通信信道进行传输的正交频分复用（OFDM）符号的方法中，其中OFDM符号包括多个OFDM音调，要包括在OFDM符号中的信息比特是编码以生成编码信息比特。经编码的信息比特被解析为多个空间流。从空间流生成的空间流或时空流被映射到使用与多个OFDM音调对应的多个空间映射矩阵来发送链。另外，i）在应用空间映射之前重新排序OFDM音调，或者ii）在应用空间流映射之后重新排序OFDM音调，并且执行重排序空间映射矩阵以匹配重新排序的OFDM音调。生成要包括在PHY数据单元中的OFDM符号。

43. 发明申请

US20120008643A1 Cyclic Shift Delays In Multi-User Packets With Resolvable Very High Throughput Long Training Fields (VHTLTFs) 有权
标题翻译：多用户数据包中的循环移位延迟，具有可解析的高通量长训练场（VHTLTF）
公开(公告)号：US20120008643A1
公开(公告)日：2012-01-12
申请号：US13177236
申请日：2011-07-06
申请人： Hongyuan Zhang , Sudhir Srinivasa
发明人： Hongyuan Zhang , Sudhir Srinivasa
IPC分类号： H04L12/02
CPC分类号： H04L27/2607 , H04B7/0671 , H04L27/261
摘要： A system including a training field generator module, a stream generator module, and a cyclic shift delay module. The training field generator module generates training fields to be transmitted in a packet to client stations. The stream generator module generates streams to be transmitted in the packet. First streams (i) are designated for a first client station and (ii) include the training fields. Second streams (i) are designated for a second client station and (ii) include the training fields. The cyclic shift delay module applies cyclic shift delay values to the streams. First cyclic shift delay values are respectively applied to the first streams. Second cyclic shift delay values are respectively applied to the second streams. At least one of the second cyclic shift delay values is equal to one of the first cyclic shift delay values. Alternatively, the second values are different than the first values.
摘要翻译：一种包括训练场发生器模块，流发生器模块和循环移位延迟模块的系统。训练场发生器模块产生要在分组中传送到客户站的训练场。流生成器模块生成要在分组中传输的流。第一流（i）被指定用于第一客户站，（ii）包括训练场。第二流（i）被指定用于第二客户站，（ii）包括训练场。循环移位延迟模块将循环移位延迟值应用于流。第一循环移位延迟值分别应用于第一流。第二循环移位延迟值分别应用于第二流。第二循环移位延迟值中的至少一个等于第一循环移位延迟值之一。或者，第二值不同于第一值。

44. 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。

45. 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。

46. 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。

47. 发明授权

US08941538B1 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：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。

48. 发明授权

US08891640B2 Uplink training for MIMO implicit beamforming 有权
标题翻译：用于MIMO隐式波束成形的上行链路训练
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。

49. 发明授权

US08826106B2 Low bandwidth PHY for WLAN 有权
标题翻译： WLAN的低带宽PHY
公开(公告)号：US08826106B2
公开(公告)日：2014-09-02
申请号：US13494505
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： G06F11/00 , H03M13/00 , H04L1/00 , H04L7/04
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 data units corresponding to first and second PHY modes, respectively. Generating the first data unit includes FEC encoding first information bits, mapping the FEC-encoded bits to first constellation symbols, and generating first OFDM symbols to include the first constellation symbols. The first OFDM symbols utilize a first tone spacing, and include a first number of non-zero tones collectively spanning a first bandwidth. Generating the second data unit includes FEC encoding second information bits, block encoding the FEC-encoded bits, mapping the block-encoded bits to second constellation symbols, and generating second OFDM symbols to include the second constellation symbols. The second OFDM symbols utilize the first tone spacing, and include a second number of non-zero tones collectively spanning a second bandwidth less than the first bandwidth. The second number of non-zero tones is less than the first number of non-zero tones.
摘要翻译：一种方法包括分别产生对应于第一和第二PHY模式的第一和第二数据单元。生成第一数据单元包括FEC编码第一信息比特，将FEC编码比特映射到第一星座符号，以及生成第一OFDM符号以包括第一星座符号。第一OFDM符号利用第一音调间隔，并且包括共同跨越第一带宽的第一数量的非零音调。生成第二数据单元包括FEC编码第二信息比特，对FEC编码比特进行块编码，将块编码比特映射到第二星座符号，以及生成第二OFDM符号以包括第二星座符号。第二OFDM符号利用第一音调间隔，并且包括共同跨越小于第一带宽的第二带宽的第二数量的非零音调。第二数量的非零音调小于第一个非零音调数。

50. 发明申请

US20140126659A1 PARSING AND ENCODING METHODS IN A COMMUNICATION SYSTEM 有权
标题翻译：通信系统中的分离和编码方法
公开(公告)号：US20140126659A1
公开(公告)日：2014-05-08
申请号：US13246577
申请日：2011-09-27
申请人： Sudhir Srinivasa , Hongyuan Zhang
发明人： Sudhir Srinivasa , Hongyuan Zhang
IPC分类号： H04L27/28
CPC分类号： H04L1/0643 , H04L1/0016 , H04L1/0042 , H04L5/0044 , H04L27/2602 , H04L27/2626
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 is received. A number of padding bits that need to be added to the information bits such that the information bits, after having been encoded, fill an integer number of orthogonal frequency division multiplexing (OFDM) symbols is determined. The number of padding bits is added to the information bits prior to encoding and the information bits are parsed to a number of encoders. The information bits are encoded to generate coded data bits. A last block of the data unit is encoded differently from the previous blocks. The PHY data unit to include the coded data bits is generated.
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，接收要包括在PHY数据单元中的多个信息位。需要添加到信息比特的多个填充比特，使得已经被编码之后的信息比特填满整数个正交频分复用（OFDM）符号。将填充比特数添加到编码前的信息比特，并将信息比特解析为多个编码器。信息位被编码以产生编码数据位。数据单元的最后一个块与先前的块不同的编码。生成包含编码数据位的PHY数据单元。

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