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：US08363587B2

公开(公告)日：2013-01-29

申请号：US12408938

申请日：2009-03-23

申请人： Simone Merlin ,  Hemanth Sampath ,  Santosh Abraham ,  Alok Aggarwal ,  Vinay Sridhara ,  Sameer Vermani

发明人： Simone Merlin ,  Hemanth Sampath ,  Santosh Abraham ,  Alok Aggarwal ,  Vinay Sridhara ,  Sameer Vermani

IPC分类号： H04H20/71

CPC分类号： H04B7/065 ,  H04B7/0417 ,  H04B7/0434

摘要： Different methods of signaling between an access point and user terminals in a multiuser wireless system for performing a minimum mean square error (MMSE) precoding at the access point preceded with eigenmode selection are provided. For one embodiment of the present disclosure, a compact feedback may be utilized between a plurality of user terminals and the access point. For another embodiment of the present disclosure, a hybrid feedback may be utilized between the plurality of user terminals and the access point. For yet another embodiment of the present disclosure, a full feedback may be utilized between the plurality of user terminals and the access point.

摘要翻译： 提供了在多用户无线系统中的接入点和用户终端之间用于在本征模式选择之前的接入点执行最小均方误差（MMSE）预编码的不同的信令方法。 对于本公开的一个实施例，可以在多个用户终端和接入点之间使用紧凑的反馈。 对于本公开的另一实施例，可以在多个用户终端和接入点之间使用混合反馈。 对于本公开的另一个实施例，可以在多个用户终端和接入点之间使用完全反馈。

公开(公告)号：US20120281620A1

公开(公告)日：2012-11-08

申请号：US13287921

申请日：2011-11-02

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

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

IPC分类号： H04W24/10 ,  H04W4/00

CPC分类号： H04B7/0417 ,  H04B7/0413 ,  H04B7/0617 ,  H04B7/0643 ,  H04B7/065 ,  H04B7/0689 ,  H04L1/0035 ,  H04L1/0054

摘要： Certain aspects of the present disclosure propose transmitting a feedback message to an access point. The feedback may comprise a beamforming extension field, which may carry per tone signal to noise ratio of a station. For certain aspects, the station transmitting the per-tone SNR may be a single user (SU)-capable device. For certain aspects, the station may indicate to the access point whether or not it has a maximum likelihood (ML) receiver.

摘要翻译： 本公开的某些方面提出将反馈消息发送到接入点。 反馈可以包括波束形成扩展字段，其可以承载站的每个音调信噪比。 对于某些方面，发送每音调SNR的电台可以是单用户（SU）能力设备。 对于某些方面，站可以向接入点指示其是否具有最大似然（ML）接收机。

公开(公告)号：US20120140754A1

公开(公告)日：2012-06-07

申请号：US13368458

申请日：2012-02-08

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

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

IPC分类号： H04W84/02

CPC分类号： H04W72/046 ,  H04W16/28 ,  H04W28/18

摘要： A method, an apparatus, and a computer program product operable in a wireless communication system are provided in which an access probe is generated for transmission to a wireless node. A first signal is generated for transmission to the wireless node. The first signal includes information corresponding to a first preferred beam pattern from the wireless node to the apparatus. A second signal is received from the wireless node including information corresponding to a second preferred beam pattern from the apparatus to the wireless node. The second preferred beam pattern is determined based on the access probe. The apparatus communicates with the wireless node using at least one of the first preferred beam pattern or the second preferred beam pattern.

摘要翻译： 提供了一种在无线通信系统中可操作的方法，装置和计算机程序产品，其中产生访问探针用于传输到无线节点。 生成第一信号以传输到无线节点。 第一信号包括对应于从无线节点到设备的第一优选波束图案的信息。 从无线节点接收到包括与从装置到无线节点的第二优选波束图对应的信息的第二信号。 基于访问探针确定第二优选波束图案。 该装置使用第一优选波束图或第二优选波束图案中的至少一个与无线节点进行通信。

公开(公告)号：US20120117446A1

公开(公告)日：2012-05-10

申请号：US13043259

申请日：2011-03-08

申请人： Mohammad Hossein Taghavi Nasrabadi ,  Hemanth Sampath ,  Simone Merlin ,  Santosh P. Abraham ,  Sameer Vermani ,  Rahul Tandra

发明人： Mohammad Hossein Taghavi Nasrabadi ,  Hemanth Sampath ,  Simone Merlin ,  Santosh P. Abraham ,  Sameer Vermani ,  Rahul Tandra

IPC分类号： H03M13/05 ,  G06F11/10

CPC分类号： H04L1/0003 ,  H04L1/0009 ,  H04L1/0019 ,  H04L1/0041 ,  H04L1/0057 ,  H04L1/0065 ,  H04L1/008 ,  H04L1/1819 ,  Y02D50/10

摘要： In a first aspect, an aggregated packet (A-MPDU) includes packets (MPDUs) and EC-Blocks (Error Correction Blocks) containing error correction coding information. A transmitter uses a Fountain coding scheme (for example, Raptor or RaptorQ) to generate the error correction coding information from the MPDUs. If a receiver detects an error in a received MPDU, then the receiver uses the error correction coding information from the EC-Blocks to correct the error. In a second novel aspect, a determination is made as to whether a change in error rate is more likely due to collisions or to a low SNR. If the determination is that the change is due to collisions then the MCS index is adjusted to restore a target error rate, whereas if the determination is that the change is due to a low SNR then the number of EC-Blocks per A-MPDU is adjusted to restore the target error rate.

摘要翻译： 在第一方面，聚合分组（A-MPDU）包括包含纠错编码信息的分组（MPDU）和EC-块（纠错块）。 发射机使用喷泉编码方案（例如，Raptor或RaptorQ）从MPDU生成纠错编码信息。 如果接收机检测到接收到的MPDU中的错误，则接收机使用来自EC-Block的纠错编码信息来校正错误。 在第二个新颖的方面，确定误差率的变化是否更可能是由于冲突或低SNR。 如果确定改变是由于冲突，则MCS索引被调整以恢复目标错误率，而如果确定改变是由于低SNR，则每个A-MPDU的EC块的数量是 调整以恢复目标错误率。