公开(公告)号：US07321644B2

公开(公告)日：2008-01-22

申请号：US10863455

申请日：2004-06-08

申请人： David J. Love ,  Srinath Hosur ,  Anuj Batra

发明人： David J. Love ,  Srinath Hosur ,  Anuj Batra

IPC分类号： H03D1/00

CPC分类号： H04L1/005 ,  H04B7/04 ,  H04L25/0204 ,  H04L27/2601

摘要： A greater likelihood decoder, a method of deriving a reduced substreams maximum likelihood (RSML) decoded symbol vector and a multiple-input, multiple-output (MIMO) receiver incorporating the decoder or the method. In one embodiment, the decoder includes: (1) a suboptimal decoder that analyzes a received symbol vector to generate substream indicators and a decoded symbol vector estimate, (2) weakest substreams decision logic, coupled to the suboptimal decoder, that receives the substream indicators and selects weakest ones thereof and (3) subspace search logic, coupled to the suboptimal decoder and the weakest substreams decision logic, that further selects a reduced substreams maximum likelihood (RSML) decoded symbol vector from a subspace of decoded symbol vector candidates derived from the decoded symbol vector estimate and the weakest ones.

摘要翻译： 更大似然解码器，导出减少的子流最大似然（RSML）解码符号向量的方法和包含解码器或方法的多输入多输出（MIMO）接收机的方法。 在一个实施例中，解码器包括：（1）分析接收的符号向量以产生子流指示符和解码的符号向量估计的次优解码器，（2）耦合到次优解码器的最弱子流决策逻辑，其接收子流指示符 并选择最弱的子码流决策逻辑，以及（3）子空间搜索逻辑，该子空间搜索逻辑耦合到次优解码器和最弱子流判决逻辑，其进一步从从解码符号向量候选导出的解码符号向量候选的子空间中选择减少的子流最大似然（RSML）解码符号向量 解码符号向量估计和最弱的符号向量估计。

公开(公告)号：US07280622B2

公开(公告)日：2007-10-09

申请号：US10644545

申请日：2003-08-20

申请人： David J. Love ,  Srinath Hosur ,  Anuj Batra

发明人： David J. Love ,  Srinath Hosur ,  Anuj Batra

IPC分类号： H03D1/00 ,  H04L27/06

CPC分类号： H04L1/0054 ,  H04L1/06

摘要： A reduced search space minimum distance decoding method provides average probability of error performance close to optimal MAP decoding. The decoding algorithm provides dramatic complexity reductions compared with MAP decoding. A a sub-optimal decoder receives a collection of signal vectors y1 . . . yk, with k denoting a positive integer and generates an estimated transmitted multidimensional symbol {tilde over (S)}. The estimated transmitted multidimensional symbol {tilde over (S)} is decoded using hierarchical subset decoding a subset is determined therefrom. A reduced search space V is generated and minimum distance decoding is used to decode the received symbol vectors y1 . . . yk in the reduced search space V. one or more of the following: an estimated multidimensional symbol {tilde over (S)}, soft bit information, or hard bit information are cienerated therefrom.

摘要翻译： 减少的搜索空间最小距离解码方法提供误差性能的接近于最佳MAP解码的平均概率。 与MAP解码相比，解码算法提供了显着的复杂性降低。 子优化解码器接收信号矢量y 1的集合。 。 。 其中k表示正整数，并且生成估计的传输多维符号S.使用分层子集解码对估计的传输多维符号S进行解码，从其确定子集。 生成减小的搜索空间V，并且使用最小距离解码来对接收的符号向量y 1＆lt; 1＆gt; 1进行解码。 。 。 在缩小搜索空间V中的一个或多个。以下中的一个或多个：由其估计的多维符号S，软比特信息或硬比特信息。

公开(公告)号：US07257170B2

公开(公告)日：2007-08-14

申请号：US10644489

申请日：2003-08-20

申请人： David J. Love ,  Srinath Hosur ,  Anuj Batra ,  Tarik Muharemovic ,  Eko N. Onggosanusi

发明人： David J. Love ,  Srinath Hosur ,  Anuj Batra ,  Tarik Muharemovic ,  Eko N. Onggosanusi

IPC分类号： H03D1/00 ,  H04L27/06

CPC分类号： H04L25/03012 ,  H04L2025/03414 ,  H04L2025/03605 ,  H04L2025/03611

摘要： A channel norm-based ordering and whitened decoding technique (lower complexity iterative decoder) for MIMO communication systems performs approximately the same level of performance as an iterative minimum mean squared error decoder. Decoding a signal vector comprises receiving a signal vector yk, multiplying the received signal vector yk by a conjugate transpose of a channel matrix H*. A column vector zk is generated. The entries of the column vector zk are reordered and an estimated channel matrix {tilde over (H)} is generated. The estimated channel matrix {tilde over (H)} decomposed using a Cholesky decomposition and generating a triangular matrix L. Triangular matrix L is solved backwards and a signal vector {tilde over (s)}k estimated. An estimate of the transmitted symbol vector Ŝk is generated.

摘要翻译： 用于MIMO通信系统的基于信道规范的排序和白化解码技术（较低复杂度迭代解码器）执行与迭代最小均方误差解码器大致相同的性能水平。 对信号矢量进行解码包括：将接收信号矢量y N k乘以通道矩阵H *的共轭转置的信号矢量y k k。 生成列向量z 。 列向量z 的条目被重新排序，并且生成估计的信道矩阵H. 估计的信道矩阵H使用Cholesky分解分解并产生三角矩阵L.三角矩阵L向后求解并且估计信号矢量s N k。 生成发送的符号矢量S N k的估计。

公开(公告)号：US07248651B2

公开(公告)日：2007-07-24

申请号：US10644546

申请日：2003-08-20

申请人： David J. Love ,  Srinath Hosur ,  Anuj Batra

发明人： David J. Love ,  Srinath Hosur ,  Anuj Batra

IPC分类号： H03D1/00 ,  H04L27/06

CPC分类号： H04L1/06 ,  H04L25/067 ,  H04L2025/03414 ,  H04L2025/03624

摘要： A reduced search space minimum distance decoding algorithm provides average probability of error performance close to that of optimal MAP decoding. The decoding algorithm provides dramatic complexity reductions compared with MAP decoding. A sub-optimal decoder receives signal vectors y1 . . . yk. Soft output bits are generated as is a reduced search space V via a reduced search space table creation unit in response to the soft output bits and an estimated channel H. A signal vector b is generated via a maximum likelihood decoding unit in response to the reduced search space V and the signal vectors y1 . . . yk.

摘要翻译： 减少的搜索空间最小距离解码算法提供误差性能的平均概率接近于最佳MAP解码的概率。 与MAP解码相比，解码算法提供了显着的复杂性降低。 次优解码器接收信号矢量y 1。 。 。 y＆lt; k＆gt;。 响应于软输出比特和估计的信道H，经由减少的搜索空间表创建单元，生成软输出比特。通过减少的搜索空间表生成单元，通过最大似然解码单元响应于减少的搜索空间 搜索空间V和信号矢量y 1 <1。 。 。 y＆lt; k＆gt;。

公开(公告)号：US09900193B2

公开(公告)日：2018-02-20

申请号：US13566639

申请日：2012-08-03

申请人： Timothy Mark Schmidl ,  Srinath Hosur ,  Anuj Batra

发明人： Timothy Mark Schmidl ,  Srinath Hosur ,  Anuj Batra

IPC分类号： H04L27/00 ,  H04L27/26

CPC分类号： H04L27/0012 ,  H04L27/2613

摘要： A method of communicating in a wireless network including a plurality of nodes having communications devices including a first node, wherein at least one node utilizes a first physical layer (PHY) modulation, and at least one other node utilizes a second PHY modulation different from the first PHY modulation. The first node receives a PHY frame transmitted by one of the plurality of nodes, and identifies a PHY modulation type selected from the first PHY modulation and the second PHY modulation used in the PHY frame or to be used in a subsequently to be received PHY frame or frame portion. The first node decodes the PHY frame or the subsequently to be received PHY frame or frame portion using the PHY modulation type identified in the identifying step.

公开(公告)号：US08054914B2

公开(公告)日：2011-11-08

申请号：US12022461

申请日：2008-01-30

申请人： Deric W. Waters ,  Anuj Batra ,  Srinath Hosur

发明人： Deric W. Waters ,  Anuj Batra ,  Srinath Hosur

IPC分类号： H03K9/00 ,  H04L27/00

CPC分类号： H04L27/2647 ,  H04L1/206

摘要： A method and system for estimating noise variance. A method for noise variance estimation comprises receiving a first multi-sample symbol and receiving a second multi-sample symbol. The first multi-sample symbol is subtracted from the second multi-sample symbol to produce a set of noise samples. The set of noise samples is used to produce a noise variance estimate. The noise variance estimate is applied in various tasks (e.g. channel estimation, log-likelihood ratio computation, and/or minimum mean squared error equalization) to process data provided to a user.

摘要翻译： 一种用于估计噪声方差的方法和系统。 一种用于噪声方差估计的方法包括接收第一多样本符号并接收第二多样本符号。 从第二多样本符号中减去第一多样本符号以产生一组噪声样本。 噪声样本集用于产生噪声方差估计。 在各种任务（例如信道估计，对数似然比计算和/或最小均方误差均衡）中应用噪声方差估计以处理提供给用户的数据。

公开(公告)号：US07957474B2

公开(公告)日：2011-06-07

申请号：US11618432

申请日：2006-12-29

申请人： Deric Wayne Waters ,  Srinath Hosur ,  Anuj Batra

发明人： Deric Wayne Waters ,  Srinath Hosur ,  Anuj Batra

IPC分类号： H04K1/10

CPC分类号： H04L27/0012 ,  H04L27/22 ,  H04L27/2647

摘要： Disclosed herein is a system and method for determining the presence of rotated-BPSK modulation. In addition, disclosed herein is a system and method for determining if a received packet is a Legacy, Mixed-Mode, or Green-Field packet in accordance with the determination of the presence of rotated-BPSK modulation. The presence of a Green-Field packet may be determined by detecting if additional tones are being excited in an LTF symbol of the received packet and/or if a SIG field symbol following the LTF symbol is modulated by rotated-BPSK. The presence of a Mixed-Mode packet may be determined by detecting if the first four bits of the SIG field symbol following the LTF symbol are [1 1 0 1] and/or detecting if a symbol following an L-SIG symbol is modulated by rotated-BPSK. The presence of a Legacy packet may be determined by detecting if the symbol following the L-SIG symbol is modulated by BPSK.

摘要翻译： 本文公开了一种用于确定旋转BPSK调制的存在的系统和方法。 此外，本文所公开的是根据确定旋转BPSK调制的确定来确定接收的分组是传统的，混合模式的还是绿色场分组的系统和方法。 可以通过检测在接收到的分组的LTF符号中是否激励附加音调和/或如果通过旋转BPSK调制LTF符号之后的SIG字段符号，则可以确定绿场分组的存在。 混合模式分组的存在可以通过检测LTF符号之后的SIG字段符号的前四位是否为[1×10 1]和/或检测在L-SIG符号之后的符号是否被 旋转BPSK。 可以通过检测L-SIG符号之后的符号是否被BPSK调制来确定遗留分组的存在。

公开(公告)号：US07864661B2

公开(公告)日：2011-01-04

申请号：US10755603

申请日：2004-01-12

申请人： Srinath Hosur ,  Srikanth Gummadi ,  Anuj Batra ,  David P. Magee

发明人： Srinath Hosur ,  Srikanth Gummadi ,  Anuj Batra ,  David P. Magee

IPC分类号： H04J11/00

CPC分类号： H04W88/08

摘要： The present invention is directed to a time-switched preamble generator and method of generating a time-switched preamble for use with a multiple-input, multiple-output (MIMO) transmitter employing first and second transmit antennas. In one embodiment, the time-switched preamble generator includes an initial preamble formatter configured to provide a first preamble to the first transmit antenna and a second preamble to the second transmit antenna during an initial time interval. The time-switched preamble generator also includes a subsequent preamble formatter coupled to the initial preamble formatter and configured to provide the second preamble to the first transmit antenna and the first preamble to the second transmit antenna during a subsequent time interval.

摘要翻译： 本发明涉及一种时间切换前导码生成器和用于与采用第一和第二发射天线的多输入多输出（MIMO）发射机一起使用的时间切换前同步码的方法。 在一个实施例中，时间切换前导码生成器包括初始前同步码格式器，其被配置为在初始时间间隔期间向第一发射天线提供第一前同步码和第二前导码到第二发射天线。 时间切换前导码生成器还包括后续前导码格式器，其耦合到初始前导码格式化器并且被配置为在随后的时间间隔期间向第一发射天线提供第二前同步码和第一前导码到第二发射天线。

公开(公告)号：US20100180173A1

公开(公告)日：2010-07-15

申请号：US12686929

申请日：2010-01-13

申请人： Anuj Batra ,  Deric W. Waters ,  Srinath Hosur

发明人： Anuj Batra ,  Deric W. Waters ,  Srinath Hosur

IPC分类号： H04L1/18 ,  H03M13/05 ,  G06F11/10 ,  G06F11/14

CPC分类号： H04L1/1812 ,  H04L1/188 ,  H04L1/1893

摘要： Embodiments of the invention provide a system and method of hybrid automatic repeat-request (HARQ) processing. A viterbi decoder is coupled to and follows a descrambler. After the signal has been de-scrambled, it can be stored in a memory in case it needs to be recombined with another packet. This means that the log-likelihood ratios LLRs for each transmitted bit are stored in memory using a finite number of bits (for example, between 4 and 12 bits). If the packet that is currently being processed contains retransmitted information, then the de-scrambled output stored from a previous packet containing the same information can be loaded and combined with the current packet.

摘要翻译： 本发明的实施例提供了一种混合自动重传请求（HARQ）处理的系统和方法。 维特比解码器耦合到并跟随解扰器。 在信号被解除加扰之后，如果需要与另一个数据包重新组合，则可将其存储在存储器中。 这意味着每个发送的比特的对数似然比LLRs使用有限数量的比特（例如，在4比特和12比特之间）存储在存储器中。 如果当前处理的分组包含重发信息，则可以将包含相同信息的先前分组存储的去加扰输出加载并与当前分组组合。

公开(公告)号：US08699554B2

公开(公告)日：2014-04-15

申请号：US11928050

申请日：2007-10-30

申请人： Deric W. Waters ,  Anuj Batra ,  Srinath Hosur

发明人： Deric W. Waters ,  Anuj Batra ,  Srinath Hosur

IPC分类号： H03H7/30 ,  H03K5/159

CPC分类号： H04L25/03006 ,  H04L2025/03426 ,  H04L2025/03605

摘要： In at least some embodiments, a receiver for a wireless communication system is provided. The receiver includes an equalizer that provides an equalized channel matrix. The receiver also includes scaling logic coupled to the equalizer, the scaling logic selectively scales coefficients of the equalized channel matrix. The receiver also includes a decoder coupled to the scaling logic. The decoder decodes a signal based on the equalized channel matrix with scaled coefficients.

摘要翻译： 在至少一些实施例中，提供了一种用于无线通信系统的接收机。 接收机包括提供均衡信道矩阵的均衡器。 接收机还包括耦合到均衡器的缩放逻辑，缩放逻辑选择性地缩放均衡信道矩阵的系数。 接收机还包括耦合到缩放逻辑的解码器。 解码器基于具有缩放系数的均衡信道矩阵来解码信号。