公开(公告)号：US08817916B1

公开(公告)日：2014-08-26

申请号：US14065003

申请日：2013-10-28

Applicant: Marvell International Ltd.

Inventor： Konstantinos Sarrigeorgidis ,  Yanni Chen ,  Leilei Song ,  Kedar Shirali

IPC: H04L27/00

CPC classification number: H04L25/067 ,  H03M13/612 ,  H04L1/0045 ,  H04L25/03286 ,  H04L27/2647

Abstract: Methods and apparatus are provided for performing log-likelihood ratio (LLR) computations in a pipeline. Portions of a metric used to compute LLR values are computed in one pipeline part. The portions correspond to all permutations of some received signal streams. The portions are combined with one permutation x2 of the received signal stream that was not included in the previous pipeline computation in a subsequent pipeline part to produce M values associated with a particular bit position. At each subsequent clock cycle, a different permutation of x2 is combined with the previously computed portions producing different M values. State values corresponding to different values of bit positions of the received stream are computed by finding the minimum among the M values, in each clock cycle, that affect a particular bit position. The state values are combined to compute the LLR values for the bit position in a final pipeline part.

Abstract translation: 提供了在流水线中执行对数似然比（LLR）计算的方法和装置。 用于计算LLR值的度量的部分在一个管道部分中计算。 这些部分对应于一些接收的信号流的所有排列。 这些部分与接收信号流的一个置换x2组合在一起，该置换x2未被包括在随后的流水线部分中的先前流水线计算中，以产生与特定位位置相关联的M个值。 在每个随后的时钟周期，x2的不同置换与先前计算的产生不同M值的部分组合。 通过在每个时钟周期内找到影响特定位位置的M个值中的最小值来计算对应于接收流的比特位置的不同值的状态值。 组合状态值以计算最终流水线部分中位位置的LLR值。

公开(公告)号：US09258042B1

公开(公告)日：2016-02-09

申请号：US13948001

申请日：2013-07-22

Applicant: Marvell International Ltd.

Inventor： Rohit U. Nabar ,  Kedar Shirali ,  Hui-Ling Lou

IPC: H04L25/49 ,  H04B7/04

CPC classification number: H04B7/043 ,  H04B7/0413 ,  H04B7/0617 ,  H04B7/0669 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0026 ,  H04L1/0054 ,  H04L1/0071 ,  H04L1/06 ,  H04L25/03961

Abstract: A beamforming technique used in a MIMO wireless transmission system determines a transmitter beamforming steering matrix using a matrix equalizer of a transmitter or a receiver within the MIMO communication system, to thereby increase the speed and/or to decrease the processing needed to implement effective beamforming within the transmitter of the communication system. This beamforming technique can be used when a transmitter, with multiple transmitter antennas, is used to communicate with one or with multiple receivers within the communication system.

Abstract translation: 在MIMO无线传输系统中使用的波束成形技术使用MIMO通信系统内的发射机或接收机的矩阵均衡器确定发射机波束成形导引矩阵，从而提高速度和/或减少实现有效波束成形所需的处理 通信系统的发射机。 当具有多个发射机天线的发射机用于与通信系统内的一个或多个接收机通信时，可以使用该波束成形技术。

公开(公告)号：US08812930B1

公开(公告)日：2014-08-19

申请号：US14028256

申请日：2013-09-16

Applicant: Marvell International Ltd.

Inventor： Kedar Shirali ,  Rohit U. Nabar ,  Vikas Gulati ,  Sudhir Srinivasa

IPC: H03M13/00

CPC classification number: H03M13/6561 ,  H03M13/116 ,  H03M13/1185 ,  H03M13/2906 ,  H03M13/611 ,  H03M13/6527

Abstract: A low-density parity check (LDPC) encoder that calculate parity check values for a message using an LDPC parity check matrix is provided. A matrix-vector multiplication unit is operative to multiply a portion of the LDPC parity check matrix and the message to obtain an intermediate vector. A parallel recursion unit is operative to recursively calculate a first plurality of parity check values for the message based on the intermediate vector and to recursively calculate a second plurality of parity check values for the message based on the intermediate vector. The first plurality of parity check values are calculated in parallel with the second plurality of parity check values.

Abstract translation: 提供了使用LDPC奇偶校验矩阵计算消息的奇偶校验值的低密度奇偶校验（LDPC）编码器。 矩阵向量乘法单元用于将LDPC奇偶校验矩阵和消息的一部分相乘以获得中间向量。 并行递归单元用于基于中间向量递归地计算消息的第一多个奇偶校验值，并且基于中间向量递归地计算消息的第二多个奇偶校验值。 与第二多个奇偶校验值并行计算第一多个奇偶校验值。

公开(公告)号：US08705600B1

公开(公告)日：2014-04-22

申请号：US13854937

申请日：2013-04-01

Applicant: Marvell International Ltd.

Inventor： Leilei Song ,  Rohit U. Nabar ,  Hui-Ling Lou ,  Kedar Shirali

IPC: H04B3/46

CPC classification number: H04L27/0008 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0036 ,  H04L27/22 ,  H04L27/38

Abstract: One or more communications parameters associated with a multiple input, multiple output (MIMO) signal transmitted by a transmitter are identified. The one or more communications parameters include one or more of (i) a number of receive antennas via which the MIMO signal is received, (ii) a number of spatial streams in the MIMO signal, and (iii) a signal to noise ratio (SNR) corresponding to the MIMO signal. A particular data detection technique of a plurality of data detection techniques employed by a receiver is selected in accordance with at least one of the one or more communications parameters.

Abstract translation: 识别与由发射机发射的多输入多输出（MIMO）信号相关联的一个或多个通信参数。 所述一个或多个通信参数包括以下中的一个或多个：（i）接收MIMO信号的多个接收天线，（ii）MIMO信号中的多个空间流，以及（iii）信噪比（ SNR）。 根据一个或多个通信参数中的至少一个来选择由接收机采用的多个数据检测技术的特定数据检测技术。

公开(公告)号：US09369914B1

公开(公告)日：2016-06-14

申请号：US14223838

申请日：2014-03-24

Applicant: Marvell International Ltd.

Inventor： Kedar Shirali ,  Ravi Narasimhan ,  Yungping Hsu

IPC: G01R31/08 ,  H04W28/02

CPC classification number: H04W28/0236 ,  H04L25/0206 ,  H04L25/0242 ,  H04W24/10 ,  H04W28/22

Abstract: Systems and techniques relating to wireless signal processing. A described technique includes receiving a signal, having subcarriers, over a wireless channel formed by a number-of-receive-antennas and a number-of-transmit-antennas; determining a signal quality measure of a received signal having subcarriers, the signal quality measure being based on channel gain matrices corresponding respectively to the subcarriers of the received signal, the channel gain matrices having dimensions of the number-of-receive-antennas by the number-of-transmit-antennas; determining a channel quality measure of the received signal that measures a frequency selectivity of the wireless channel; determining a data rate of information transmission over the wireless channel based on the signal quality measure and the channel quality measure, the signal quality measure serving as a primary determinant of the data rate and the channel quality measure serves as a secondary determinant of the data rate; and transmitting information over the wireless channel in accordance with the data rate.

Abstract translation: 与无线信号处理相关的系统和技术。 所描述的技术包括：通过由接收天线数量和数量的发射天线形成的无线信道接收具有子载波的信号; 确定具有子载波的接收信号的信号质量测量，所述信号质量测量基于分别对应于所接收信号的子载波的信道增益矩阵，所述信道增益矩阵具有接收天线数量的数量 发射天线; 确定测量无线信道的频率选择性的接收信号的信道质量测量; 基于信号质量测量和信道质量测量来确定无线信道上的信息传输的数据速率，用作数据速率和信道质量测量的主要决定因素的信号质量度量用作数据速率的次要决定因素 ; 以及根据数据速率通过无线信道发送信息。

公开(公告)号：US09166836B1

公开(公告)日：2015-10-20

申请号：US14281635

申请日：2014-05-19

Applicant: Marvell International Ltd.

Inventor： Konstantinos Sarrigeorgidis ,  Kedar Shirali

IPC: H03H7/30 ,  H04L25/03 ,  H04B7/04 ,  H04L27/26 ,  H04L25/02 ,  H04L1/00

CPC classification number: H04L25/03891 ,  H04B7/0413 ,  H04L1/004 ,  H04L1/005 ,  H04L1/0054 ,  H04L1/0625 ,  H04L5/0023 ,  H04L25/0204 ,  H04L25/0242 ,  H04L25/0244 ,  H04L27/2601 ,  H04L2025/03414 ,  H04L2025/03636 ,  H04L2025/03649

Abstract: An estimate of a multiple input, multiple output (MIMO) channel is computed, and an equalizer to be applied to signals received via the MIMO channel is computed. The equalizer is initialized based on the estimate of the MIMO channel. The equalizer is applied to a received signal, and the received signal is demodulated to generate a demodulated signal. The demodulated signal is decoded according to an error correction code to generate decoded data, and the decoded data is re-encoded according to the error correction code to generate re-encoded data. The re-encoded data is re-modulated to generate a re-modulated signal. The received signal is compared to the re-modulated signal, and the equalizer is updated based on the comparison. After updating the equalizer, the equalizer is applied to the received signal.

Abstract translation: 计算多输入多输出（MIMO）信道的估计，并且计算要应用于经由MIMO信道接收的信号的均衡器。 基于MIMO信道的估计来初始化均衡器。 均衡器被应用于接收信号，并且接收的信号被解调以产生解调信号。 根据纠错码对解调后的信号进行解码，生成解码数据，根据纠错码重新编码解码后的数据，生成再编码数据。 重新编码的数据被重新调制以产生重新调制的信号。 将接收的信号与再调制信号进行比较，并且基于该比较来更新均衡器。 在更新均衡器之后，均衡器被应用于接收到的信号。

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：US09014320B1

公开(公告)日：2015-04-21

申请号：US14275287

申请日：2014-05-12

Applicant: Marvell International Ltd.

Inventor： Leilei Song ,  Rohit U. Nabar ,  Kedar Shirali

IPC: H04B14/06 ,  H04B15/02 ,  H04B7/04 ,  H04B1/10

CPC classification number: H04B15/02 ,  H04B1/10 ,  H04B7/0413 ,  H04L1/0054 ,  H04L1/06 ,  H04L1/20

Abstract: Systems and methods are provided for whitening noise of a received signal vector in a multiple-input multiple-output (MIMO) transmission or storage system. The whitening filter may be designed to whiten an interference component of the received signal vector, where the interference component is derived from modeling transmitter and receiver imperfections as a first coupling between MIMO transmitter outputs and a second coupling between MIMO receiver. The whitening filter may be computed based on the covariance matrix of the interference component.

Abstract translation: 提供了用于在多输入多输出（MIMO）传输或存储系统中对接收信号向量的噪声进行白化的系统和方法。 白化滤波器可以被设计为对接收信号矢量的干扰分量进行白化，其中干扰分量是从模拟发射机和接收机缺陷得到的，作为MIMO发射机输出与MIMO接收机之间的第二耦合的第一耦合。 可以基于干涉分量的协方差矩阵来计算白化滤波器。

公开(公告)号：US08731039B1

公开(公告)日：2014-05-20

申请号：US13953710

申请日：2013-07-29

Applicant: Marvell International Ltd.

Inventor： Konstantinos Sarrigeorgidis ,  Kedar Shirali

IPC: H04B7/02

CPC classification number: H04L25/03891 ,  H04B7/0413 ,  H04L1/004 ,  H04L1/005 ,  H04L1/0054 ,  H04L1/0625 ,  H04L5/0023 ,  H04L25/0204 ,  H04L25/0242 ,  H04L25/0244 ,  H04L27/2601 ,  H04L2025/03414 ,  H04L2025/03636 ,  H04L2025/03649

Abstract: An estimate of a multiple input, multiple output (MIMO) channel is computed, and an equalizer to be applied to signals received via the MIMO channel is computed. The equalizer is initialized based on the estimate of the MIMO channel. The equalizer is applied to a received signal, and the received signal is demodulated to generate a demodulated signal. The demodulated signal is decoded according to an error correction code to generate decoded data, and the decoded data is re-encoded according to the error correction code to generate re-encoded data. The re-encoded data is re-modulated to generate a re-modulated signal. The received signal is compared to the re-modulated signal, and the equalizer is updated based on the comparison. After updating the equalizer, the equalizer is applied to the received signal.

Abstract translation: 计算多输入多输出（MIMO）信道的估计，并且计算要应用于经由MIMO信道接收的信号的均衡器。 基于MIMO信道的估计来初始化均衡器。 均衡器被应用于接收信号，并且接收的信号被解调以产生解调信号。 根据纠错码对解调后的信号进行解码，生成解码数据，根据纠错码重新编码解码后的数据，生成再编码数据。 重新编码的数据被重新调制以产生重新调制的信号。 将接收的信号与再调制信号进行比较，并且基于该比较来更新均衡器。 在更新均衡器之后，均衡器被应用于接收到的信号。

公开(公告)号：US08824610B1

公开(公告)日：2014-09-02

申请号：US13758410

申请日：2013-02-04

Applicant: Marvell International Ltd.

Inventor： Atul Salhotra ,  Kedar Shirali ,  Zhiyu Yang ,  Hui-Ling Lou

IPC: H04B7/10 ,  H04L1/02

CPC classification number: H04B7/0857 ,  H04B7/084 ,  H04L2025/03414 ,  H04L2025/03426

Abstract: A method for performing a clear channel assessment to determine whether a wireless channel is clear for transmission of a transmit signal. The method includes receiving, through the wireless channel, a plurality of signals, wherein the plurality of signals are respectively received via a plurality of antennas of the receiver determining a signal strength of each of the plurality of signals, autocorrelating the plurality of signals to respectively generate a plurality of autocorrelated signals, weighting each autocorrelated signal of the plurality of autocorrelated signals based on one or more of the signal strengths determined for each of the plurality of signals, combining each autocorrelated signal, as weighted, to generate a combined signal, demodulating the combined signal, and determining, based at least in part on the demodulation of the combined signal, whether the wireless channel is clear for the transmission of the transmit signal onto the wireless channel.

Abstract translation: 一种用于执行清除信道评估以确定无线信道是否清楚以发送发射信号的方法。 该方法包括：通过无线信道接收多个信号，其中分别经由接收机的多个天线接收多个信号，确定多个信号中的每一个的信号强度，分别将多个信号自相关 生成多个自相关信号，基于为每个多个信号确定的一个或多个信号强度对所述多个自相关信号中的每个自相关信号进行加权，将每个自相关信号合并为加权，以产生组合信号，解调 组合信号，以及至少部分地基于组合信号的解调来确定无线信道是否清楚地将发射信号传输到无线信道上。