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：US08867667B2

公开(公告)日：2014-10-21

申请号：US13438639

申请日：2012-04-03

申请人： Mohammad Hossein Taghavi Nasrabadi ,  Hemanth Sampath ,  Didier Johannes Richard Van Nee

发明人： Mohammad Hossein Taghavi Nasrabadi ,  Hemanth Sampath ,  Didier Johannes Richard Van Nee

IPC分类号： H04L27/00 ,  H04W88/06

CPC分类号： H04W88/06 ,  Y02D70/142

摘要： Systems, methods, and devices to enable monitoring of wireless networks are described herein. In some aspects, a low power receiver or a receiver operating in a low power mode scans for signals with a moderate or low duty cycle. If a signal identifying a device or user of the receiver, or a signal indicating that there will be a subsequent data communication, is received, a high power receiver or a receiver operating in a high power mode is activated to receive data communications.

摘要翻译： 本文描述了能够监视无线网络的系统，方法和设备。 在一些方面，低功率接收机或以低功率模式工作的接收机扫描中等或低占空比的信号。 如果接收到识别接收机的设备或用户的信号或指示将进行后续数据通信的信号，则激活高功率接收机或以高功率模式操作的接收机以接收数据通信。

公开(公告)号：US08830813B1

公开(公告)日：2014-09-09

申请号：US13448185

申请日：2012-04-16

申请人： Hemanth Sampath ,  Ravi Narasimhan

发明人： Hemanth Sampath ,  Ravi Narasimhan

IPC分类号： H04J11/00

CPC分类号： H04L5/0026 ,  H04L1/0606 ,  H04L1/0643 ,  H04L5/0007 ,  H04L5/0023 ,  H04L5/0044

摘要： Systems, devices, and techniques for MIMO (Multiple-In-Multiple-Out) based space-frequency coding can include, in at least some implementations, techniques that include selecting a spatial multiplexing rate M for a transmission of data via two or more antennas, the data comprising N data streams, applying a first mapping to map the N data streams to a first portion of the antennas for a first data tone; and applying a different second mapping to map the N data streams to a different second portion of the antennas for a second data tone.

摘要翻译： 基于MIMO（Multiple-In-Multiple-Out）的空间 - 频率编码的系统，设备和技术在至少一些实施方式中可以包括：通过两个或更多个天线选择用于数据传输的空间复用速率M ，所述数据包括N个数据流，应用第一映射以将N个数据流映射到第一数据音调的天线的第一部分; 以及应用不同的第二映射以将N个数据流映射到用于第二数据音调的天线的不同第二部分。

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：US08693331B1

公开(公告)日：2014-04-08

申请号：US12983825

申请日：2011-01-03

申请人： Hemanth Sampath ,  Ravi Narasimhan

发明人： Hemanth Sampath ,  Ravi Narasimhan

IPC分类号： G08C15/00

CPC分类号： H04W28/22 ,  H04W84/18

摘要： Systems and techniques for rate adaptation in wireless communication systems are described. A described technique includes generating a transmission packet parameter associated with packets transmitted by a device at a first data rate; generating a reception packet parameter associated with packets received by the device; determining a second data rate based on the transmission packet parameter and the reception packet parameter; and transmitting future packets at the second data rate.

摘要翻译： 描述了用于无线通信系统中速率适配的系统和技术。 所描述的技术包括：以第一数据速率生成与由设备发送的分组相关联的传输分组参数; 产生与由所述设备接收的分组相关联的接收分组参数; 基于所述传输分组参数和所述接收分组参数来确定第二数据速率; 并以第二数据速率发送未来数据包。

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：US08599945B2

公开(公告)日：2013-12-03

申请号：US11449893

申请日：2006-06-09

申请人： Hemanth Sampath

发明人： Hemanth Sampath

IPC分类号： H04B7/02 ,  H04L1/02

CPC分类号： H04L1/0026 ,  H04B7/0417 ,  H04B7/063 ,  H04B7/0632 ,  H04B7/0697 ,  H04L1/0003 ,  H04L1/0007 ,  H04L1/0009 ,  H04L1/0025 ,  H04W52/04 ,  H04W52/26

摘要： Techniques for performing rank prediction in a MIMO system are described. Performance metrics for a plurality of ranks are initially determined. Each rank is indicative of a different number of data streams to send simultaneously via a MIMO channel. The performance metrics may relate to the capacity or signal quality of the MIMO channel or the throughput of data transmission sent via the MIMO channel. Adjustments are applied to the performance metrics for the ranks to obtain adjusted performance metrics. The adjustments account for system losses such as losses due to an error correction code used for data transmission, channel estimation errors at a receiver, variation in interference observed by the receiver, variability in transmit power due to power control, and/or other factors. A rank is selected for use based on the adjusted performance metrics for the ranks.

摘要翻译： 描述了用于在MIMO系统中执行秩预测的技术。 初始确定多个等级的性能指标。 每个等级表示通过MIMO信道同时发送的不同数量的数据流。 性能度量可以涉及MIMO信道的容量或信号质量或经由MIMO信道发送的数据传输的吞吐量。 对行列的绩效指标进行调整，以获得调整后的绩效指标。 该调整涉及系统损耗，例如由于用于数据传输的纠错码，接收机处的信道估计误差，接收机观测到的干扰变化，由于功率控制引起的发射功率变化以及/或其它因素造成的损耗。 根据排名的调整后的绩效指标，选择使用等级。

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：US08532081B1

公开(公告)日：2013-09-10

申请号：US13425350

申请日：2012-03-20

申请人： Ravi Narasimhan ,  Hemanth Sampath

发明人： Ravi Narasimhan ,  Hemanth Sampath

IPC分类号： H04J1/00

CPC分类号： H04L1/0001 ,  H04B7/0689

摘要： A transmit data rate adaptation method in a multiple-in-multiple-out (MIMO) system with a first transceiver and a second transceiver. The first transceiver transmits signals to the second transceiver. The second transceiver analyzes channel quality of the received signals and uses link adaptation to generate a shortlist of transmit modes to send back to the first transceiver. The first transceiver cycles through the shortlist of transmit modes to find an optimum transmit mode.

摘要翻译： 一种具有第一收发器和第二收发器的多输入多出（MIMO）系统中的发送数据速率适配方法。 第一收发器向第二收发器发射信号。 第二收发器分析所接收信号的信道质量，并使用链路自适应来生成发送模式的最短列表以发送回第一收发信机。 第一个收发器循环通过发送模式的最短列表以找到最佳发送模式。

公开(公告)号：US08520571B2

公开(公告)日：2013-08-27

申请号：US12396270

申请日：2009-03-02

申请人： Arunava Chaudhuri ,  Iwen Yao ,  Jeremy H. Lin ,  Ali RostamPisheh ,  Raghu Challa ,  Hemanth Sampath ,  Megan Wu ,  Joseph Zanotelli ,  Mrinal Nath

发明人： Arunava Chaudhuri ,  Iwen Yao ,  Jeremy H. Lin ,  Ali RostamPisheh ,  Raghu Challa ,  Hemanth Sampath ,  Megan Wu ,  Joseph Zanotelli ,  Mrinal Nath

IPC分类号： H04B7/00

CPC分类号： G06F15/7842

摘要： A flexible and reconfigurable digital system (for example, a wireless modem) includes a set of sub-circuits. Each sub-circuit includes a task manager and an amount of configurable hardware circuitry for performing a type of operation on a data stream. The task manager of a sub-circuit can configure and control the configurable hardware of the sub-circuit. A central processor configures and orchestrates operation of the sub-circuits by maintaining a set of task lists in a tightly coupled memory. Each task list includes task instructions for a corresponding sub-circuit. The task manager of a sub-circuit reads task instructions from its task list and controls its associated hardware circuitry as directed by the instructions. A timestamp task instruction and a push task instruction and the task list architecture allow modem sub-circuits to be easily reconfigured to operate in accordance with either a first air interface standard or a second air interface standard.

摘要翻译： 灵活和可重新配置的数字系统（例如，无线调制解调器）包括一组子电路。 每个子电路包括任务管理器和用于对数据流执行一种操作的可配置硬件电路的量。 子电路的任务管理器可以配置和控制子电路的可配置硬件。 中央处理器通过在紧耦合存储器中维护一组任务列表来配置和协调子电路的操作。 每个任务列表包括相应子电路的任务指令。 子电路的任务管理器从其任务列表读取任务指令，并根据指令控制其相关联的硬件电路。 时间戳任务指令和推送任务指令以及任务列表架构允许将调制解调器子电路轻松地重新配置为根据第一空中接口标准或第二空中接口标准进行操作。