公开(公告)号：US20130315050A1

公开(公告)日：2013-11-28

申请号：US13953355

申请日：2013-07-29

Applicant: MARVELL INTERNATIONAL LTD.

Inventor： Hongyuan Zhang ,  Rohit U. Nabar ,  Peter Loc

IPC: H04B7/04

CPC classification number: H04B7/0426 ,  H04B7/0417 ,  H04B7/0443 ,  H04B7/0447 ,  H04B7/0632 ,  H04B7/0691 ,  H04B7/0817 ,  H04B7/0874 ,  H04L25/0202 ,  H04L25/0226 ,  H04L25/0228 ,  H04L27/2647 ,  H04W52/42

Abstract: A method of antenna selection, in a MIMO system in which a transmitter having a first plurality of RF chains communicates with a receiver having a second plurality of RF chains, includes transmitting consecutive sounding packets produced by the first plurality of RF chains. The consecutive sounding packets each include a training symbol, and collectively sound a full-size channel for the MIMO system. The method also includes receiving channel state information for each of a plurality of scaled sub-channel estimates determined at the receiver. The channel state information includes at least one of respective gain factors that were applied to the consecutive sounding packets received at the receiver and respective scaling factors that were applied to sub-channel estimates determined at the receiver. The method also includes adjusting power levels applied to the first plurality of RF chains in response to receiving the channel state information.

Abstract translation: 一种在MIMO系统中的天线选择方法，其中具有第一多个RF链的发射机与具有第二多个RF链的接收机通信包括发射由第一多个RF链产生的连续的探测分组。 连续的探测分组各自包括训练符号，并且共同地为MIMO系统发出全尺寸信道。 该方法还包括为在接收机处确定的多个缩放的子信道估计中的每一个接收信道状态信息。 信道状态信息包括应用于在接收机处接收到的连续探测分组的各个增益因子中的至少一个以及应用于在接收机处确定的子信道估计的各个缩放因子。 该方法还包括响应于接收到信道状态信息来调整应用于第一多个RF链的功率电平。

公开(公告)号：US10462790B1

公开(公告)日：2019-10-29

申请号：US15924573

申请日：2018-03-19

Applicant: Marvell International Ltd.

Inventor： Hongyuan Zhang ,  Rohit U. Nabar ,  Hui-Ling Lou

IPC: H04W72/04 ,  H04L5/00 ,  H04W84/12

Abstract: An access point (AP) device of a wireless local area network (WLAN) assigns a plurality of different orthogonal frequency division multiplexing (OFDM) sub-channel blocks to a plurality of client stations that are members of the WLAN. The AP device receives respective independent data for the plurality of client stations, and generates an orthogonal frequency division multiple access (OFDMA) data unit that includes a preamble and, for each sub-channel block in the plurality of OFDM sub-channel blocks: a respective legacy portion of the preamble that spans only the OFDM sub-channel block, the legacy portion including a respective legacy signal field that indicates a duration of the OFDMA data unit, a respective non-legacy signal field in the preamble, the respective non-legacy signal field spanning only the OFDM sub-channel block, and respective independent data for a respective client station, the respective independent data included within the OFDM sub-channel block.

公开(公告)号：US09614707B1

公开(公告)日：2017-04-04

申请号：US15005150

申请日：2016-01-25

Applicant: Marvell International Ltd.

Inventor： Hongyuan Zhang ,  Rohit U. Nabar ,  Sudhir Srinivasa

IPC: H04L27/26 ,  H04W28/02 ,  H04W72/12 ,  H04B7/06 ,  H04W84/12

CPC classification number: H04L27/2602 ,  H04B7/0684 ,  H04L1/0625 ,  H04L1/0675 ,  H04L25/0204 ,  H04L25/0224 ,  H04W28/0263 ,  H04W72/04 ,  H04W72/1263 ,  H04W84/12

Abstract: In generating a data unit for transmission via a communication channel, a preamble of the data unit is generated, including i) generating a set of training fields, and ii) mapping each training field in the set of training fields to a plurality of space-time streams. When the set of training fields consist of four training fields, each training field in the set of training fields is mapped to four space-time streams according to a first space-time stream mapping matrix. When the set of training fields consists of six training fields, each training field in the set of training fields is mapped to six space-time streams according to a second space-time stream mapping matrix, wherein the first space-time stream mapping matrix is not a submatrix of the second space-time stream mapping matrix. A data portion of the data unit is generated so that a receiver device can receive the data portion via a corresponding number of space-time streams using channel information derived from the set of training fields.

公开(公告)号：US09509382B1

公开(公告)日：2016-11-29

申请号：US14312435

申请日：2014-06-23

Applicant: MARVELL INTERNATIONAL LTD.

Inventor： Rohit U. Nabar ,  Hui-Ling Lou

IPC: H04B7/04 ,  H04B7/06

CPC classification number: H04B7/0473 ,  H04B7/0408 ,  H04B7/0417 ,  H04B7/043 ,  H04B7/061 ,  H04B7/0874

Abstract: In a method for determining a transmit steering matrix for use in transmission of an information signal from a first communication device to at least one second communication device, a subset of antennas of the at least one second communication device is selected from a plurality of different subsets of the antennas of the at least one second communication device, wherein selecting the subset of antennas is for developing the steering matrix for transmit beamforming from the first communication device to the least one second communication device. The steering matrix is developed i) based on training signals received via the selected subset of the antennas of the at least one second communication device, and ii) assuming that only the selected subset of the antennas of the at least one second communication device will be utilized by the at least one second communication device when receiving the information signal.

Abstract translation: 在用于确定用于从第一通信设备到至少一个第二通信设备的信息信号的传输中使用的发射导引矩阵的方法中，从多个不同的子集中选择所述至少一个第二通信设备的天线子集 其中选择所述天线子集用于从所述第一通信设备向所述至少一个第二通信设备开发用于发射波束成形的导引矩阵。 开发导引矩阵i）基于经由所选择的至少一个第二通信设备的天线的子集接收的训练信号，以及ii）假定只有所选择的至少一个第二通信设备的天线子集将为 由所述至少一个第二通信设备在接收到所述信息信号时使用。

公开(公告)号：US09444577B1

公开(公告)日：2016-09-13

申请号：US14190988

申请日：2014-02-26

Applicant: MARVELL INTERNATIONAL LTD.

Inventor： Hongyuan Zhang ,  Rohit U. Nabar ,  Sudhir Srinivasa

IPC: H04L12/28 ,  H04L12/56 ,  H04L1/00 ,  H04L25/03 ,  H04B7/04 ,  H04L25/02

CPC classification number: H04L1/0026 ,  H04B7/0413 ,  H04B7/0617 ,  H04B7/0619 ,  H04B7/0667 ,  H04B7/068 ,  H04L1/16 ,  H04L25/0206 ,  H04L25/03 ,  H04L25/03949

Abstract: A bi-directionally calibrated beamforming technique for use in a MIMO wireless communication system includes a transmitter communicating a calibration initiation signal to a receiver requesting the receiver send a non-sounding packet containing an estimated description of the forward channel. The receiver also sends a sounding packet to the transmitter. The transmitter determining a partial or full estimated description of a reverse channel based on the received non-sounding packet and/or the receiving sounding packet. The transmitter further determines one or more transmitter correction matrices from receiving estimated description of the forward channel and the partial or full estimated description of the reverse channel. The transmitter sending the partial or full estimated description of the reverse channel to the receiver, which determines one or more receiver correction matrices.

Abstract translation: 在MIMO无线通信系统中使用的双向校准波束成形技术包括将校准启动信号传送到接收机的发射机，该接收机请求接收机发送包含前向信道估计描述的非发声分组。 接收机还向发射机发送一个探测包。 所述发射机基于所接收到的非探测分组和/或接收探测分组来确定反向信道的部分或全部估计描述。 发射机进一步确定一个或多个发射机校正矩阵从接收正向信道的估计描述和反向信道的部分或全部估计描述。 发射机向接收机发送反向信道的部分或全部估计描述，其确定一个或多个接收机校正矩阵。

公开(公告)号：US09319904B1

公开(公告)日：2016-04-19

申请号：US14875305

申请日：2015-10-05

Applicant: Marvell International Ltd.

Inventor： Sudhir Srinivasa ,  Xiayu Zheng ,  Hongyuan Zhang ,  Rohit U. Nabar ,  Riddhi Madani ,  Atul Salhotra ,  Erik Heinke ,  Brian Bosso

IPC: G06F11/00 ,  H04J1/16 ,  H04L1/00 ,  H04L12/26 ,  H04W24/02 ,  H04W84/12

CPC classification number: H04W24/00 ,  H04B17/14 ,  H04L43/0852

Abstract: A first sounding packet is transmitted from the wireless communication device to a calibration station. A first channel descriptor is generated based on the first sounding packet. A second sounding packet is transmitted from the calibration station to the wireless communication device. A second channel descriptor is generated based on the second sounding packet. The first channel descriptor and the second channel descriptor are obtained at a processor device. Calibration coefficients indicative of one or both of phase imbalance and amplitude imbalance between a receive radio frequency (RF) chain and a transmit RF chain at the wireless communication device are generated based on the first and the second channel descriptors. The calibration coefficients are sent from the processor device to the wireless communication device.

Abstract translation: 第一探测包从无线通信设备发送到校准站。 基于第一探测包生成第一信道描述符。 第二探测包从校准站发送到无线通信设备。 基于第二探测包生成第二信道描述符。 在处理器设备处获得第一信道描述符和第二信道描述符。 基于第一和第二信道描述符生成指示无线通信设备处的接收射频（RF）链和发射RF链之间的相位不平衡和幅度不平衡之一或两者的校准系数。 校准系数从处理器设备发送到无线通信设备。

公开(公告)号：US09203488B1

公开(公告)日：2015-12-01

申请号：US14171769

申请日：2014-02-03

Applicant: Marvell International Ltd.

Inventor： Hongyuan Zhang ,  Rohit U. Nabar ,  Srinivasa H. Garlapati

IPC: H04B1/38 ,  H04L7/00 ,  H04B7/04

CPC classification number: H04B7/0421 ,  H04B7/0413 ,  H04B7/0456 ,  H04B7/0617 ,  H04B17/11 ,  H04B17/12 ,  H04B17/18 ,  H04B17/19

Abstract: A first communication device transmits a data unit configured to prompt a second communication device to transmit a non-sounding data unit with a number of spatial streams equal to a number of transmit antennas available at the second communication device, wherein the second communication device does not support implicit transmit beamforming. Responsive to the data unit transmitted from the first communication device, the non-sounding data unit is received from the second communication device. The first communication device develops an estimate of a reverse channel via which the non-sounding data unit traveled based on the non-sounding data unit. The first communication device develops a transmit beamforming matrix based on the estimate of the reverse channel, the transmit beamforming matrix for the first communication device to utilize when transmitting via a forward channel.

Abstract translation: 第一通信设备发送数据单元，该数据单元被配置为提示第二通信设备发送具有等于第二通信设备可用的多个发送天线的空闲流的数量的非探测数据单元，其中第二通信设备不 支持隐式发射波束成形。 响应于从第一通信设备发送的数据单元，从第二通信设备接收不发声数据单元。 第一通信设备产生基于非发声数据单元行进的非探测数据单元的反向信道的估计。 第一通信设备基于反向信道的估计来开发发射波束形成矩阵，第一通信设备的发射波束形成矩阵在经由前向信道发射时利用。

公开(公告)号：US09160436B1

公开(公告)日：2015-10-13

申请号：US14107183

申请日：2013-12-16

Applicant: Marvell International Ltd.

Inventor： Jungwon Lee ,  Rohit U. Nabar ,  Hui-Ling Lou

IPC: H03D1/00 ,  H04L27/06 ,  H04B7/08 ,  H04B1/10

CPC classification number: H04B7/08 ,  H04B1/10 ,  H04B7/0669 ,  H04B7/0845 ,  H04L1/0631 ,  H04L1/0668

Abstract: Systems and methods are provided for decoding a signal vector in a transmit diversity scheme for varying channels. Information obtained in more than one symbol period are treated as a single received vector, and each of the received signal vectors may be processed to reduce the effects of varying channel characteristics. The received signal vectors may be combined by addition and decoded using a maximum-likelihood decoder. In some embodiments, the received signal vectors are processed separately and then combined. In other embodiments, the received signal vectors are combined and then processed. In some embodiments, zero-forced linear equalization techniques are used to processed the received signals. In some embodiments the signal vectors and varying channel response matrices are broken down to equivalent forms in order to simplify the processing.

Abstract translation: 提供了用于对用于不同信道的发射分集方案中的信号矢量进行解码的系统和方法。 在多个符号周期中获得的信息被视为单个接收向量，并且可以处理每个接收信号向量以减少变化的信道特性的影响。 接收的信号矢量可以通过加法组合，并使用最大似然解码器解码。 在一些实施例中，接收的信号向量被单独处理，然后组合。 在其他实施例中，接收的信号向量被组合然后被处理。 在一些实施例中，使用零强制线性均衡技术来处理所接收的信号。 在一些实施例中，为了简化处理，信号向量和变化的信道响应矩阵被分解成等同的形式。

公开(公告)号：US09143219B1

公开(公告)日：2015-09-22

申请号：US14320098

申请日：2014-06-30

Applicant: MARVELL INTERNATIONAL LTD.

Inventor： Arul Durai Murugan Palanivelu ,  Hui-Ling Lou ,  Kedar Shirali ,  Rohit U. Nabar ,  Atul Salhotra

IPC: H04B7/06

CPC classification number: H04B7/0678 ,  H04L1/06

Abstract: A transceiver utilizes a spatial spreading matrix to distribute two or more encoded spatial data streams to multiple antennas. The spatial spreading matrix satisfies one or more of the following two constraints: (a) the ratio of squared norms of the sum of the components of a row, for different rows of the spatial spreading matrix, is equal to a first constant sequence, and (b) the ratio of squared norms of the sum of a symbol S1 to be transmitted, when the symbol S1 is equal to 1 or −1, multiplied by each of the components of a row, for different rows of the spatial spreading matrix, is equal to a second constant sequence.

Abstract translation: 收发器利用空间扩展矩阵将两个或多个编码空间数据流分配到多个天线。 空间扩展矩阵满足以下两个约束中的一个或多个：（a）对于空间扩展矩阵的不同行，行的分量之和的平方的比率等于第一常数序列，并且 （b）对于空间扩展矩阵的不同行，当符号S1等于1或-1时，要发送的符号S1的总和的平方范数与行的每个分量相乘， 等于第二个常数序列。

公开(公告)号：US09049072B1

公开(公告)日：2015-06-02

申请号：US14253482

申请日：2014-04-15

Applicant: Marvell International Ltd.

Inventor： Rohit U. Nabar ,  Hongyuan Zhang

IPC: H04L25/06 ,  H04L25/03

CPC classification number: H04L25/061 ,  H04L25/03993 ,  H04L25/062 ,  H04L25/067 ,  H04L27/2657 ,  H04L27/2689

Abstract: Systems and methods for removing a DC offset from an orthogonal frequency division multiplexed (OFDM) signal transmitted over a plurality of subcarrier frequencies. The system includes a receiver. The system further includes a high pass DC component filter configured to reduce a DC component of the orthogonal frequency division multiplexed signal, the high pass DC component filter shaping noise in the orthogonal frequency division multiplexed signal which results in a non-uniform power spectral density of the noise across the plurality of subcarrier frequencies. The system further includes a noise whitener configured to compensate for the noise shaping by the high pass DC component filter by normalizing the non-uniform power spectral density of the noise across the plurality of subcarrier frequencies.