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公开(公告)号：US09614605B1
公开(公告)日：2017-04-04
申请号：US14320515
申请日：2014-06-30
Applicant: MARVELL INTERNATIONAL LTD.
Inventor： Ravi Narasimhan
CPC classification number: H04B7/068 , H04L1/0606 , H04L27/2601
Abstract: Method, apparatus, and data packet format to implement transmit diversity in a multicarrier environment is disclosed. For diversity transmission operations, space frequency encoding techniques are employed creating distinguishable first and second time domain signals from a multicarrier frequency domain symbol bearing data of interest, which are then broadcast in parallel over first and second transmission units respectively. For diversity reception operations, complementary space frequency decoding is used to recover a corrected multicarrier frequency domain symbol from a time domain signal containing either this symbol, a space frequency modified symbol based on the multicarrier symbol, or a possible partial/complete combination of both. The data packet format includes portions defining a transmission diversity semaphore, a preamble enabling training of a receiver receiving the data packet, and a payload.
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2.发明授权Systems and methods for compensating a channel estimate for phase and sampling phase jitter 有权用于补偿相位和采样相位抖动的信道估计的系统和方法公开(公告)号：US09432276B1
公开(公告)日：2016-08-30
申请号：US14927982
申请日：2015-10-30
Applicant: Marvell International Ltd.
Inventor： Ravi Narasimhan
CPC classification number: H04L43/087 , H03L7/091 , H04L7/0016 , H04L25/0224 , H04L25/024 , H04L27/2602 , H04L27/2656 , H04L27/2657 , H04L27/2675
Abstract: A system including a circuit to compensate for sampling phase jitter. The system includes a channel estimator to determine, based on training symbols in a preamble of a data packet received via a communication channel, an estimate of the communication channel and a carrier frequency associated with the communication channel. The circuit compensates, based on the determined carrier frequency, a phase of the estimate of the communication channel to adjust for a carrier frequency offset associated with the communication channel, and, based on a data rate at which the data packet was received via the communication channel, selectively compensates the estimate of the communication channel for sampling phase jitter.
Abstract translation: 一种包括补偿采样相位抖动的电路的系统。 该系统包括信道估计器，用于基于经由通信信道接收的数据分组的前导码中的训练符号来确定通信信道的估计和与通信信道相关联的载波频率。 该电路基于所确定的载波频率补偿通信信道的估计的相位，以调整与通信信道相关联的载波频率偏移，并且基于通过通信接收数据分组的数据速率 通道，有选择地补偿用于采样相位抖动的通信信道的估计。
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3.发明授权Systems and methods for compensating a channel estimate for sampling phase jitter 有权用于补偿采样相位抖动的信道估计的系统和方法公开(公告)号：US09185013B1
公开(公告)日：2015-11-10
申请号：US14314684
申请日：2014-06-25
Applicant: Marvell International Ltd.
Inventor： Ravi Narasimhan
CPC classification number: H04L43/087 , H03L7/091 , H04L7/0016 , H04L25/0224 , H04L25/024 , H04L27/2602 , H04L27/2656 , H04L27/2657 , H04L27/2675
Abstract: A system including a channel estimator configured to generate an estimate of a communication channel based on a data packet received via the communication channel. A circuit is configured to determine a data rate at which the data packet was received via the communication channel, determine whether the data rate at which the data packet was received via the communication channel is greater than a threshold, and selectively compensate the channel estimate generated by the channel estimator for sampling phase jitter based on the determination of whether the data rate at which the data packet was received via the communication channel is greater than the threshold.
Abstract translation: 一种包括信道估计器的系统，被配置为基于经由通信信道接收的数据分组来生成通信信道的估计。 电路被配置为确定经由通信信道接收数据分组的数据速率，确定经由通信信道接收到数据分组的数据速率是否大于阈值，并且选择性地补偿生成的信道估计 基于通过通信信道接收数据分组的数据速率是否大于阈值的确定来确定采样相位抖动的信道估计器。
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公开(公告)号：US08861499B1
公开(公告)日：2014-10-14
申请号：US14022046
申请日：2013-09-09
Applicant: Marvell International Ltd.
Inventor： Ravi Narasimhan , Hemanth Sampath
CPC classification number: H04L1/0001 , H04B7/0689
Abstract: Systems and techniques relating to wireless communication are described. A described technique includes transmitting a first signal wirelessly to a wireless communication device in accordance with a first transmit mode that is selected from a plurality of transmit modes; receiving a shortlist from the wireless communication device, the shortlist identifying a subset of the transmit modes, the subset of the transmit modes including two or more modes that are different from the first transmit mode; selecting a second transmit mode from the shortlist; transmitting a second signal wirelessly to the wireless communication device in accordance with the second transmit mode; and selectively cycling through any remaining modes of the shortlist based on a lack of reception of an acknowledgement to the second signal. The wireless communication device can be configured to generate the shortlist based on a channel quality analysis of a received version of the first signal.
Abstract translation: 描述与无线通信相关的系统和技术。 所描述的技术包括：根据从多个发送模式中选择的第一发送模式，无线地向无线通信装置发送第一信号; 从所述无线通信设备接收候选列表，所述候选列表识别所述发送模式的子集，所述发送模式的子集包括与所述第一发送模式不同的两个或更多个模式; 从候选名单中选择第二发送模式; 根据第二发送模式向无线通信设备无线地发送第二信号; 并且基于缺少对第二信号的确认的接收，选择性地循环到所述候选列表的任何剩余模式。 无线通信设备可以被配置为基于对第一信号的接收版本的信道质量分析来生成候选列表。
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公开(公告)号：US09094116B1
公开(公告)日：2015-07-28
申请号：US14146665
申请日：2014-01-02
Applicant: Marvell International Ltd.
Inventor： Ravi Narasimhan , Hemanth Sampath , Hsiao-Cheng Tang
CPC classification number: H04L27/2663 , H04B7/0413 , H04B17/21 , H04L1/0054 , H04L5/0007 , H04L5/0023 , H04L5/0026 , H04L25/0204 , H04L25/03159 , H04L27/2602 , H04L27/266
Abstract: A device includes circuitry configured to receive orthogonal frequency-division multiplexing (OFDM) symbols of a training sequence via two or more receive antennas, and circuitry configured to correlate training samples of the OFDM symbols received via the two or more receive antennas to generate a correlation result, estimate a frequency offset using an angle of the correlation result, and correct samples of training symbols in at least one multiple-in-multiple-out (MIMO)-OFDM frame using the frequency offset.
Abstract translation: 一种设备包括被配置为经由两个或多个接收天线接收训练序列的正交频分复用（OFDM）符号的电路，以及经配置以将经由两个或更多个接收天线接收的OFDM符号的训练样本相关联以产生相关性的电路 结果，使用相关结果的角度估计频率偏移，并且使用频率偏移在至少一个多输入多输出（MIMO）-OFDM帧中校正训练符号的样本。
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Patent Agency Ranking
公开(公告)号：US09935665B1
公开(公告)日：2018-04-03
申请号：US14931089
申请日：2015-11-03
Applicant: Marvell International Ltd.
Inventor： Ravi Narasimhan , Hemanth Sampath
CPC classification number: H04B1/38 , H04B7/0447 , H04B7/0671 , H04B7/0697 , H04J13/004 , H04L1/0637 , H04L5/0023 , H04L5/0044 , H04L5/0053 , H04L27/2613
Abstract: A transmitter including a transmit section and a frame formatter. The transmit section is to generate a stream of data to be transmitted using a plurality of antennas and separate the stream of data into a plurality of substreams corresponding to respective ones of the plurality of antennas. The frame formatter is to form respective frames of data from the plurality of substreams. Each of the frames of data includes a short preamble including short training symbols, a long preamble including long training symbols, and a signal field indicating a quantity of the plurality of antennas. The transmit section is further to transmit the frames of data using respective ones of the plurality of antennas.
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公开(公告)号：US09271192B1
公开(公告)日：2016-02-23
申请号：US14244750
申请日：2014-04-03
Applicant: Marvell International Ltd.
Inventor： Hemanth Sampath , Ravi Narasimhan
IPC: H04W28/22
Abstract: Techniques and systems for rate adaption in wireless systems are disclosed. A disclosed technique includes generating confidence measures for a plurality of data rates based at least on a first indicator and a second indicator, the first indicator corresponding to packet loss associated with packets transmitted by a device at a first data rate that is selected from the plurality of data rates, and the second indicator corresponding to one or more signal quality values associated with one or more packets received by the device; selecting, from the plurality of data rates, a second data rate based at least on the confidence measures; and transmitting one or more additional packets at the second data rate.
Abstract translation: 公开了用于无线系统中速率适配的技术和系统。 所公开的技术包括至少基于第一指示符和第二指示符来产生针对多个数据速率的置信度度量，对应于由从多个设备选择的第一数据速率的设备发送的分组相关联的分组丢失的第一指示符 的数据速率，并且所述第二指示符对应于与所述设备接收的一个或多个分组相关联的一个或多个信号质量值; 从所述多个数据速率中选择至少基于所述置信度量的第二数据速率; 以及以第二数据速率发送一个或多个附加分组。
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8.发明授权公开(公告)号：US08792325B1
公开(公告)日：2014-07-29
申请号：US13941787
申请日：2013-07-15
Applicant: Marvell International Ltd.
Inventor： Ravi Narasimhan
IPC: H04J11/00
CPC classification number: H04L27/3863 , H04L25/022 , H04L25/0228 , H04L25/023 , H04L27/2665 , H04L27/2695
Abstract: A system includes a mapping device. The mapping device groups encoded bits of OFDM symbols into first groups. For each of the first groups, the mapping device maps adjacent bits onto non-adjacent subcarriers of multiple subcarriers and in an alternating manner onto bits of a signal constellation such that: every other one of the adjacent bits are mapped to first bits on the signal constellation; and bits other than the every other one of the adjacent bits are mapped to second bits on the signal constellation. Each of the first groups has a corresponding complex number. The mapping device: groups predetermined numbers of the first groups into second groups, where each of the second groups corresponds to one of the OFDM symbols; and maps each of the second groups to one of the multiple subcarriers such that the multiple subcarriers are modulated based on the complex numbers.
Abstract translation: 系统包括映射设备。 映射设备将OFDM符号的编码比特分组成第一组。 对于每个第一组，映射设备将相邻位映射到多个子载波的非相邻子载波上，并且以交替方式映射到信号星座的位上，使得相邻位中的每一个被映射到信号上的第一位 星座; 并且除了相邻位之中的每一个之外的位被映射到信号星座上的第二位。 每个第一组具有相应的复数。 映射设备：将预定数量的第一组分组成第二组，其中每个第二组对应于OFDM符号之一; 并将每个第二组映射到多个子载波之一，使得基于复数对多个子载波进行调制。
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公开(公告)号：US08634451B1
公开(公告)日：2014-01-21
申请号：US13669167
申请日：2012-11-05
Applicant: Marvell International Ltd.
Inventor： Ravi Narasimhan , Hemanth Sampath , Hsiao-Cheng Tang
CPC classification number: H04L27/2663 , H04B7/0413 , H04B17/21 , H04L1/0054 , H04L5/0007 , H04L5/0023 , H04L5/0026 , H04L25/0204 , H04L25/03159 , H04L27/2602 , H04L27/266
Abstract: A device includes circuitry configured to receive orthogonal frequency-division multiplexing (OFDM) symbols of a training sequence, and circuitry configured to correlate training samples of the OFDM symbols to determine a frequency offset and configured to provide the determined frequency offset to perform frequency offset compensation for at least one multiple-in-multiple-out (MIMO)-OFDM frame to correct samples of training symbols in the at least one MIMO-OFDM frame. The correlated training samples correspond to a number of receive antennas through which the training sequence was received.
Abstract translation: 一种设备包括被配置为接收训练序列的正交频分复用（OFDM）符号的电路，以及被配置为将OFDM符号的训练样本相关联以确定频率偏移并被配置为提供所确定的频率偏移以执行频率偏移补偿的电路 对于至少一个多输入多输出（MIMO）-OFDM帧来校正所述至少一个MIMO-OFDM帧中的训练符号的样本。 相关的训练样本对应于接收训练序列的多个接收天线。
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10.发明授权Adaptively determining a data rate of packetized information transmission over a wireless channel 有权通过无线信道自适应地确定分组信息传输的数据速率公开(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
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。
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