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公开(公告)号：US09673875B1
公开(公告)日：2017-06-06
申请号：US15052206
申请日：2016-02-24
Applicant: Marvell International LTD.
Inventor： Hongyuan Zhang , Rohit U. Nabar , Sudhir Srinivasa
IPC: H04B7/04 , H04L27/26 , H04L25/03 , H04B7/0408 , H04B7/0456 , H04B7/06 , H04B7/0413 , H04B7/0417
CPC classification number: H04B7/0408 , H04B7/0413 , H04B7/0417 , H04B7/0456 , H04B7/0617 , H04K1/10 , H04K3/224 , H04K2203/32 , H04L1/0003 , H04L1/0015 , H04L1/0026 , H04L5/0023 , H04L5/0044 , H04L5/0091 , H04L25/03343 , H04L27/0008 , H04L27/2601 , H04L27/2626 , H04L27/2636 , H04L27/2646
Abstract: A first device including a receiver, a steering module, and a transmitter. The receiver receives a first signal transmitted using a first modulation scheme from a second device. The steering module obtains a steering matrix from the first signal transmitted using the first modulation scheme from the second device. The transmitter transmits a second signal using a second modulation scheme to the second device by reusing the steering matrix obtained from the first signal transmitted using the first modulation scheme from the second device. The first modulation scheme and the second modulation scheme are selected from a plurality of orthogonal frequency division multiplexing based modulation schemes. The second modulation scheme is different from the first modulation scheme.
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公开(公告)号：US09425872B1
公开(公告)日：2016-08-23
申请号：US14954640
申请日：2015-11-30
Applicant: Marvell International Ltd.
Inventor： Hongyuan Zhang , Rohit U. Nabar , Srinivasa H. Garlapati
CPC classification number: H04B7/0421 , H04B7/0413 , H04B7/0456 , H04B7/0617 , H04B17/11 , H04B17/12 , H04B17/18 , H04B17/19
Abstract: A first communication device receives a non-sounding data unit from a second communication device that does not support beamforming training procedures. 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: 第一通信设备从不支持波束成形训练程序的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。
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43.发明授权Methods and apparatus for adaptively selecting a communications mode in high frequency systems 有权用于在高频系统中自适应选择通信模式的方法和装置公开(公告)号：US09420594B1
公开(公告)日：2016-08-16
申请号：US14550511
申请日：2014-11-21
Applicant: Marvell International Ltd.
Inventor： Rohit U. Nabar , Hongyuan Zhang , Arul Durai Murugan Palanivelu , Hui-Ling Lou , Songping Wu
CPC classification number: H04W72/085 , H04L5/0007 , H04L5/0023 , H04L5/0028 , H04L5/0069 , H04L5/0085 , H04L25/0204 , H04L25/0228 , H04L27/0008 , H04L27/261 , H04W24/10 , H04W88/06
Abstract: Methods and apparatus are provided for adaptively selecting a communications mode in high frequency systems. A first dual-mode device having capabilities of using two or more high frequency communications modes, such as OFDM and SC modulation, may transmit a signal to a second dual-mode device with the same capabilities. The second dual-mode device may compute a channel characteristic associated with a high frequency communications channel and select an optimal high frequency communications mode. The second dual-mode device may transmit information indicative of the channel characteristic or the selected communications mode to the first dual-mode device. The first dual-mode device may select and operate using the optimal high frequency communications mode based on the information received from the second dual-mode device. The first and second dual-mode devices may communicate using the selected high frequency communications mode.
Abstract translation: 提供了用于在高频系统中自适应地选择通信模式的方法和装置。 具有使用诸如OFDM和SC调制之类的两个或多个高频通信模式的能力的第一双模设备可以将信号发送到具有相同能力的第二双模设备。 第二双模设备可以计算与高频通信信道相关联的信道特性并选择最佳高频通信模式。 第二双模设备可以向第一双模设备发送指示信道特性或所选通信模式的信息。 第一双模设备可以基于从第二双模设备接收的信息，使用最佳高频通信模式来选择和操作。 第一和第二双模式设备可以使用所选择的高频通信模式进行通信。
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44.发明授权公开(公告)号：US09247579B1
公开(公告)日：2016-01-26
申请号：US13888206
申请日：2013-05-06
Applicant: MARVELL INTERNATIONAL LTD.
Inventor： Hongyuan Zhang , Rohit U. Nabar , Sudhir Srinivasa
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.
Abstract translation: 在生成用于经由通信信道进行传输的数据单元时，生成数据单元的前同步码，包括i）生成一组训练场，以及ii）将训练场集合中的每个训练场映射到多个空间 - 时间流。 当训练场集合由四个训练场组成时，根据第一时空流映射矩阵将训练场集合中的每个训练场映射到四个时空流。 当该组训练场由六个训练场组成时，根据第二时空流映射矩阵将训练场集合中的每个训练场映射到六个时空流，其中第一时空流映射矩阵为 不是第二个空时流映射矩阵的子矩阵。 生成数据单元的数据部分，使得接收机设备可以使用从训练场集合导出的信道信息经由相应数量的空时流来接收数据部分。
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公开(公告)号：US09178745B2
公开(公告)日：2015-11-03
申请号：US14044710
申请日：2013-10-02
Applicant: MARVELL INTERNATIONAL LTD.
Inventor： Hongyuan Zhang , Rohit U. Nabar , Raja Banerjea , Yong Liu , Sudhir Srinivasa , Hyukjoon Kwon
CPC classification number: H04L29/0653 , H04L1/004 , H04L1/0046 , H04L1/0065 , H04L1/08 , H04L5/0007 , H04L27/2602 , H04L27/2613 , H04L27/2617 , H04L27/2621 , H04L27/2626 , H04L27/2636
Abstract: In a method for generating a physical layer (PHY) data unit for transmission via a communication channel, information bits to be included in the PHY data unit are encoded using a forward error correction (FEC) encoder. Also, the information bits are encoded according to a block coding scheme, where m copies of each bit are included in the information bits, and one or more bits in the m copies of each bit are flipped. The information bits are mapped to a plurality of constellation symbols, and a plurality of orthogonal frequency division multiplexing (OFDM) symbols are generated to include the plurality of constellation symbols. The PHY data unit is generated to include the plurality of OFDM symbols.
Abstract translation: 在通过通信信道生成用于发送的物理层（PHY）数据单元的方法中，使用前向纠错（FEC）编码器对要包括在PHY数据单元中的信息比特进行编码。 此外，信息比特根据块编码方案进行编码，其中每个比特的m个副本被包括在信息比特中，并且每个比特的m个副本中的一个或多个比特被翻转。 信息比特被映射到多个星座符号，并且生成多个正交频分复用（OFDM）符号以包括多个星座符号。 生成PHY数据单元以包括多个OFDM符号。
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Patent Agency Ranking
46.发明授权Channel sounding and estimation strategies for antenna selection in MIMO systems 有权MIMO系统中天线选择的信道探测和估计策略公开(公告)号：US09178586B2
公开(公告)日：2015-11-03
申请号：US13953355
申请日：2013-07-29
Applicant: MARVELL INTERNATIONAL LTD.
Inventor： Hongyuan Zhang , Rohit U. Nabar , Peter Loc
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。
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公开(公告)号：US09154969B1
公开(公告)日：2015-10-06
申请号：US13626841
申请日：2012-09-25
Applicant: MARVELL INTERNATIONAL LTD.
Inventor： Sudhir Srinivasa , Xiayu Zheng , Hongyuan Zhang , Rohit U. Nabar , Riddhi Madani , Atul Salhotra , Erik Heinke , Brian Bosso
CPC classification number: H04W24/00 , H04B17/14 , H04L43/0852
Abstract: In a method of calibrating a wireless communication device, 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 controller. 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 controller to the wireless communication device.
Abstract translation: 在校准无线通信设备的方法中，第一探测分组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。 在控制器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。 校准系数从控制器发送到无线通信设备。
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公开(公告)号：US08995587B1
公开(公告)日：2015-03-31
申请号：US13893104
申请日：2013-05-13
Applicant: Marvell International Ltd.
Inventor： Hongyuan Zhang , Sudhir Srinivasa , Rohit U. Nabar
CPC classification number: H04B7/043 , H04B7/0417 , H04L1/06
Abstract: A method for processing a preamble of a data unit transmitted via a communication channel includes receiving a signal via a plurality of antennas, applying a plurality of distinct steering vectors to the received signal to generate a plurality of respective outputs, and using the plurality of outputs to perform at least one of carrier sensing and symbol timing synchronization associated with the preamble.
Abstract translation: 一种用于处理通过通信信道发送的数据单元的前同步码的方法包括经由多个天线接收信号，向接收信号应用多个不同的导向矢量以产生多个相应的输出，并且使用多个输出 以执行与前导码相关联的载波侦听和符号定时同步中的至少一个。
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公开(公告)号：US08971457B1
公开(公告)日：2015-03-03
申请号：US13647523
申请日：2012-10-09
Applicant: Marvell International Ltd.
Inventor： Rohit U. Nabar , Hongyuan Zhang
IPC: H04L27/06
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.
Abstract translation: 用于从通过多个子载波频率发送的正交频分复用（OFDM）信号中去除DC偏移的系统和方法。 该系统包括一个接收器。 该系统还包括高通DC分量滤波器，其被配置为减少正交频分复用信号的DC分量，正交频分复用信号中的高通DC分量滤波器整形噪声，其导致不均匀的功率谱密度 跨多个子载波频率的噪声。 该系统还包括噪声增益器，其被配置为通过对跨多个子载波频率的噪声的非均匀功率谱密度进行归一化来补偿高通DC分量滤波器的噪声整形。
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公开(公告)号：US08958503B1
公开(公告)日：2015-02-17
申请号：US14097856
申请日：2013-12-05
Applicant: Marvell International Ltd.
Inventor： Rohit U. Nabar , Arul Durai Murugan Palanivelu
CPC classification number: H04L1/0054 , H04L25/0204 , H04L25/024 , H04L25/067
Abstract: A method includes determining a mean square error σh2 of an estimate h of a communication channel, and receiving a data symbol y. The received data symbol y corresponds to a data symbol x transmitted over the communication channel. The method also includes determining a likelihood value for a bit in the transmitted data symbol x. Determining the likelihood value for the bit in the transmitted data symbol x includes calculating a quantity according to ⅇ - y - hx 2 σ z 2 + σ h 2 x 2 , where σz2 is a noise power associated with the communication channel. The method also includes calculating the likelihood value for the bit in the transmitted data symbol x as a function of the calculated quantity.
Abstract translation: 一种方法包括确定通信信道的估计h的均方误差＆sgr; h2，以及接收数据符号y。 所接收的数据符号y对应于通过通信信道发送的数据符号x。 该方法还包括确定发送数据符号x中的位的似然值。 确定发送数据符号x中的比特的似然值包括根据ⅇ - y - hx her 2＆sgr计算量; z 2 +＆sgr; 其中＆sgr; z2是与通信信道相关联的噪声功率。 该方法还包括根据计算出的数量计算发送数据符号x中的比特的似然值。
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