公开(公告)号：US09184810B2

公开(公告)日：2015-11-10

申请号：US13465522

申请日：2012-05-07

申请人： Zhi Quan ,  Simone Merlin ,  Santosh Paul Abraham ,  Sameer Vermani ,  Hemanth Sampath

发明人： Zhi Quan ,  Simone Merlin ,  Santosh Paul Abraham ,  Sameer Vermani ,  Hemanth Sampath

IPC分类号： H04W4/00 ,  H04B7/04 ,  H04W72/12

CPC分类号： H04B7/0452 ,  H04W72/12 ,  H04W72/1221

摘要： A method is provided for wirelessly transmitting from a transmitter to one or more receivers within a multi-user (MU) multiple-input and multiple-output (MIMO) communication system. A number of concurrent (spatial) streams are dynamically allocated in a MU-MIMO transmission to each of a plurality of served receivers to maximize total data transmitted on each transmission. Streams are allocated according to a corresponding transmission queue length for each receiver and the number of receive antennas used by each of the served receivers. A transmission timer is started upon sending the transmission. A random backoff counter is also started upon one of either: (a) expiration of the transmission timer or (b) receipt of data at a transmission queue. A new transmission is sent upon expiration of the random backoff counter if the transmission timer has expired. Otherwise, the random backoff counter is restarted one or more times until the transmission timer has expired.

摘要翻译： 提供了一种用于从多用户（MU）多输入（MIMO）通信系统中的发射机向一个或多个接收机进行无线发射的方法。 在MU-MIMO传输中动态地将多个并行（空间）流分配给多个服务接收机中的每一个，以最大化在每个传输上传输的总数据。 流根据每个接收机的相应传输队列长度和每个被服务接收机使用的接收天线的数量来分配。 传送定时器在发送传输时开始。 以下之一也开始随机退避计数器：（a）传输定时器到期或（b）在传输队列处接收数据。 如果发送定时器已经到期，则在随机退避计数器到期时发送新的传输。 否则，随机退避计数器重新启动一次或多次，直到传输定时器到期。

公开(公告)号：US08923219B2

公开(公告)日：2014-12-30

申请号：US12958959

申请日：2010-12-02

申请人： Gregory A. Breit ,  Santosh Paul Abraham ,  Sameer Vermani ,  Hemanth Sampath ,  Vincent Knowles Jones

发明人： Gregory A. Breit ,  Santosh Paul Abraham ,  Sameer Vermani ,  Hemanth Sampath ,  Vincent Knowles Jones

IPC分类号： H04W4/00 ,  H04L1/00 ,  H04B7/06 ,  H04L25/02 ,  H04L25/03 ,  H04L5/00

CPC分类号： H04L25/03343 ,  H04B7/0626 ,  H04B7/0658 ,  H04L1/0026 ,  H04L1/0029 ,  H04L1/003 ,  H04L5/0048 ,  H04L25/0204 ,  H04L25/0222 ,  H04L25/0228 ,  H04L2025/03426 ,  H04L2025/03777

摘要： Certain aspects of the present disclosure relate to techniques for achieving adaptive channel state information (CSI) feedback rate in multi-user communication systems. A rate by which CSI feedback can be transmitted from each user station of a wireless system to a serving access point may be adjusted based on evolution of a channel between that user station and the access point.

摘要翻译： 本公开的某些方面涉及用于在多用户通信系统中实现自适应信道状态信息（CSI）反馈速率的技术。 基于无线系统的每个用户站向服务接入点发送CSI反馈的速率可以基于该用户站与接入点之间的信道的演进来调整。

公开(公告)号：US08908600B2

公开(公告)日：2014-12-09

申请号：US13280776

申请日：2011-10-25

申请人： Hemanth Sampath ,  Didier Johannes Richard Van Nee ,  Sameer Vermani ,  Albert Van Zelst ,  Vincent Knowles Jones

发明人： Hemanth Sampath ,  Didier Johannes Richard Van Nee ,  Sameer Vermani ,  Albert Van Zelst ,  Vincent Knowles Jones

IPC分类号： H04L12/28 ,  H04J1/16 ,  G06F11/00 ,  G01R31/08

CPC分类号： H04B7/0626 ,  H04B7/0632

摘要： Certain aspects of the present disclosure provide techniques and apparatus for generating a unified format of channel state information (CSI) feedback for Very High Throughput (VHT) wireless systems. One example method generally includes generating, at a first apparatus, a frame comprising information relating to SNR if a second apparatus is communicating with the first apparatus using single-user MIMO (SU-MIMO) or multi-user MIMO (MU-MIMO) and transmitting a signal based on the generated frame to the second apparatus. Another example method generally includes generating, at an apparatus, a structure comprising CSI, wherein the CSI includes one of a first matrix with estimates of a channel associated with the apparatus or a second matrix obtained based on singular value decomposition (SVD) of the first matrix and wherein the structure further comprises an indication of which of the first and second matrices is included in the CSI; and transmitting the structure over the channel.

摘要翻译： 本公开的某些方面提供用于为非常高吞吐量（VHT）无线系统生成统一格式的信道状态信息（CSI）反馈的技术和装置。 一个示例性方法通常包括在第一装置处产生包括与SNR有关的信息的帧，如果第二装置使用单用户MIMO（SU-MIMO）或多用户MIMO（MU-MIMO）和第一装置正在与第一装置进行通信，则 基于所生成的帧向第二装置发送信号。 另一示例性方法通常包括在装置处生成包括CSI的结构，其中CSI包括具有与该装置相关联的信道的估计的第一矩阵之一或基于第一矩阵的奇异值分解（SVD）获得的第二矩阵 矩阵，并且其中所述结构还包括所述CSI中包括所述第一和第二矩阵中的哪一个的指示; 并通过信道发送结构。

公开(公告)号：US08824371B2

公开(公告)日：2014-09-02

申请号：US13466983

申请日：2012-05-08

申请人： Sameer Vermani ,  Santosh P. Abraham ,  Mohammad Hossein Taghavi Nasrabadi ,  Vincent K. Jones ,  Hemanth Sampath

发明人： Sameer Vermani ,  Santosh P. Abraham ,  Mohammad Hossein Taghavi Nasrabadi ,  Vincent K. Jones ,  Hemanth Sampath

IPC分类号： H04W4/00 ,  H04L12/28 ,  H04L29/06 ,  H04L1/00

CPC分类号： H04L29/06163 ,  H04L1/0011 ,  H04L1/0025 ,  H04L1/0033 ,  H04L1/0039 ,  H04L29/0653 ,  H04L69/18 ,  H04L69/22

摘要： Systems and methods for communicating packets having a plurality of formats are described herein. In some aspects, a signal (SIG) field in the preamble of a packet may indicate whether an extension field, such as an extension SIG field or SIG-B field, is included in the packet. In another aspect, one or more detectors may be used to auto-detect packets formatted as one of at least two different formats based on a short training field (STF) of a received packet. In some aspects, along training field (LTF) in the preamble of a packet may indicate whether the payload is repetition coded.

摘要翻译： 这里描述了用于传送具有多种格式的分组的系统和方法。 在一些方面，分组的前导码中的信号（SIG）字段可以指示分组中是否包括诸如扩展SIG字段或SIG-B字段的扩展字段。 在另一方面，一个或多个检测器可以用于基于接收到的分组的短训练字段（STF）来自动检测被格式化为至少两种不同格式之一的分组。 在一些方面，沿着分组的前导码中的训练场（LTF）可以指示有效载荷是否被重复编码。

公开(公告)号：US08761316B2

公开(公告)日：2014-06-24

申请号：US12406868

申请日：2009-03-18

申请人： Raghu N. Challa ,  Hemanth Sampath ,  Sameer Vermani

发明人： Raghu N. Challa ,  Hemanth Sampath ,  Sameer Vermani

IPC分类号： H04L27/06

CPC分类号： H04L25/067 ,  H04L1/0052

摘要： Systems and methods for computing log likelihood ratios in a communication system are described. A demodulated symbol may be received. A set of scalars may be determined based on a modulation order, a signal-to-noise ratio for the symbol, and a bit of the symbol. At least one log likelihood ratio for the bit may be approximated using a piecewise linear process based on the scalars and the symbol.

摘要翻译： 描述用于计算通信系统中的对数似然比的系统和方法。 可以接收解调的符号。 可以基于调制阶数，符号的信噪比和符号的位来确定一组标量。 可以使用基于标量和符号的分段线性处理来近似该比特的至少一个对数似然比。

公开(公告)号：US08625690B2

公开(公告)日：2014-01-07

申请号：US13410633

申请日：2012-03-02

申请人： Mohammad Hossein Taghavi Nasrabadi ,  Sameer Vermani ,  Lin Yang ,  Hemanth Sampath

发明人： Mohammad Hossein Taghavi Nasrabadi ,  Sameer Vermani ,  Lin Yang ,  Hemanth Sampath

IPC分类号： H04K1/10

CPC分类号： H04L27/2647 ,  H04L5/0023 ,  H04L5/0053 ,  H04L27/2613 ,  H04L27/2628

摘要： Systems, methods, and devices for wireless communication. In one aspect, an apparatus for wireless communication is provided. The apparatus includes a receiver configured to receive a wireless signal comprising a packet. At least a portion of the wireless signal is configured to be received over a bandwidth lower than or equal to 1.25 MHz. The packet is formed from at least one orthogonal frequency-division multiplexing (OFDM) symbol comprising thirty-two tones. The thirty-two tones correspond to frequency subcarriers within the bandwidth. The thirty-two tones of the at least one OFDM symbol are allocated as: twenty-four data tones, two pilot tones, five guard tones, and one direct current (DC) tone. The apparatus includes a processor configured to evaluate the wireless signal. The processor includes a transform module configured to convert the at least one OFDM symbol into a frequency domain signal using a thirty-two point mode.

摘要翻译： 用于无线通信的系统，方法和设备。 一方面，提供一种无线通信装置。 该装置包括被配置为接收包括分组的无线信号的接收机。 无线信号的至少一部分被配置为在低于或等于1.25MHz的带宽上接收。 分组由包括三十二个音调的至少一个正交频分复用（OFDM）符号形成。 32个音调对应于带宽内的频率子载波。 至少一个OFDM符号的三十二个音调被分配为：二十四个数据音调，两个导频音调，五个保护音调和一个直流（DC）音调。 该装置包括被配置为评估无线信号的处理器。 处理器包括变换模块，其被配置为使用三十二点模式将至少一个OFDM符号转换成频域信号。

公开(公告)号：US08594216B2

公开(公告)日：2013-11-26

申请号：US13216956

申请日：2011-08-24

申请人： Albert Van Zelst ,  Sameer Vermani ,  Didier Johannes Richard Van Nee ,  Hemanth Sampath ,  Vincent Knowles Jones, IV

发明人： Albert Van Zelst ,  Sameer Vermani ,  Didier Johannes Richard Van Nee ,  Hemanth Sampath ,  Vincent Knowles Jones, IV

IPC分类号： H04K1/10 ,  H04L27/28

CPC分类号： H04W72/0413 ,  H04B7/0413 ,  H04B7/0417 ,  H04B7/0617 ,  H04B7/0626 ,  H04B7/0634 ,  H04B7/0663

摘要： Beamforming may be used in MIMO communication systems to further enhance spectral efficiency. Beamforming refers to beamed transmissions to a single destination (e.g., a station) at a time, to enhance the rate and/or range of transmission. To perform beamforming from a source to one or more destinations, a channel and/or beamforming matrices corresponding to the channel needs to be known at the source, which may be obtained as feedback from the destination. However, the beamforming matrices may not be smooth over frequency as it is fed back from the destination. Therefore, certain aspects of the present disclosure provide beamforming feedback options, resulting in the smoothness of a beamforming matrix.

摘要翻译： 波束形成可以用于MIMO通信系统中以进一步提高频谱效率。 波束成形是指一次向单个目的地（例如，站）的波束传输，以增强传输的速率和/或范围。 为了从源到一个或多个目的地执行波束成形，需要在源处知道对应于该信道的信道和/或波束成形矩阵，其可以作为来自目的地的反馈获得。 然而，当从目的地反馈时，波束形成矩阵可能不是频率上的平滑。 因此，本公开的某些方面提供波束成形反馈选项，导致波束形成矩阵的平滑度。

公开(公告)号：US20130208821A1

公开(公告)日：2013-08-15

申请号：US13586667

申请日：2012-08-15

申请人： Lin Yang ,  Didier Johannes Richard Van Nee ,  Hemanth Sampath ,  Sameer Vermani

发明人： Lin Yang ,  Didier Johannes Richard Van Nee ,  Hemanth Sampath ,  Sameer Vermani

IPC分类号： H04L27/26

CPC分类号： H04L27/2608 ,  H04L1/0071 ,  H04L5/0044 ,  H04L27/2601 ,  H04L27/2602

摘要： An apparatus includes an interleaver configured to interleave encoded data and to output a series of interleaved bits to be transmitted via a 1 MHz orthogonal frequency-division multiplexing (OFDM) transmission. The apparatus also includes a modulator configured to modulate the interleaved bits and a transform module configured to transform the modulated bits. A transmit module of the apparatus is configured to transmit the transformed bits included in one or more spatial streams of the 1 MHz OFDM transmission.

摘要翻译： 一种装置包括交织器，被配置为交织编码数据并输出要通过1MHz正交频分复用（OFDM）传输发送的一系列交织比特。 该装置还包括配置成调制交错比特的调制器和被配置为变换调制比特的变换模块。 该装置的发送模块被配置为发送包括在1MHz OFDM传输的一个或多个空间流中的变换的比特。

公开(公告)号：US20130121243A1

公开(公告)日：2013-05-16

申请号：US13466929

申请日：2012-05-08

申请人： Sameer Vermani ,  Santosh P. Abraham ,  Mohammad Hossein Taghavi Nasrabadi ,  Vincent K. Jones ,  Hemanth Sampath

发明人： Sameer Vermani ,  Santosh P. Abraham ,  Mohammad Hossein Taghavi Nasrabadi ,  Vincent K. Jones ,  Hemanth Sampath

IPC分类号： H04L29/06

CPC分类号： H04L69/18 ,  H04L1/0029 ,  H04L1/0039 ,  H04L29/06163

摘要： Systems and methods for communicating packets having a plurality of formats are described herein. In some aspects, a signal (SIG) field in the preamble of a packet may indicate whether an extension field, such as an extension SIG field or SIG-B field, is included in the packet. In another aspect, one or more detectors may be used to auto-detect packets formatted as one of at least two different formats based on a short training field (STF) of a received packet. In some aspects, along training field (LTF) in the preamble of a packet may indicate whether the payload is repetition coded.

公开(公告)号：US20130044681A1

公开(公告)日：2013-02-21

申请号：US13397493

申请日：2012-02-15

申请人： Santosh Paul Abraham ,  Sameer Vermani ,  Hemanth Sampath ,  Stephen J. Shellhammer ,  Rahul Tandra

发明人： Santosh Paul Abraham ,  Sameer Vermani ,  Hemanth Sampath ,  Stephen J. Shellhammer ,  Rahul Tandra

IPC分类号： H04W4/00

CPC分类号： H04L1/0002 ,  H04L1/0009 ,  H04L1/0025 ,  H04L1/0027 ,  H04W16/14 ,  H04W52/262 ,  H04W52/50

摘要： Certain aspects of the present disclosure provide techniques and apparatus for managing transmit power in a television white space (TVWS) network. By managing transmit power as described herein, medium re-use may be improved in such a network, and unfair usage problems may be alleviated. One example method generally includes receiving a request message comprising an indication of a modulation and coding scheme (MCS) for transmitting data frames to be received, determining a link margin based on the MCS, and transmitting a response message with an indication of the link margin. Another example method generally includes determining a MCS for transmitting data frames and transmitting a request message comprising an indication of the MCS.

摘要翻译： 本公开的某些方面提供了用于管理电视空白（TVWS）网络中的发射功率的技术和装置。 通过如本文所述管理发送功率，可以在这样的网络中改善中等重复使用，并且可以减轻不公平的使用问题。 一个示例性方法通常包括接收包括用于发送要接收的数据帧的调制和编码方案（MCS）的指示的请求消息，基于MCS确定链路余量，以及发送具有链路余量指示的响应消息 。 另一示例性方法通常包括确定用于发送数据帧的MCS并发送包括MCS的指示的请求消息。