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：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：US08243843B2

公开(公告)日：2012-08-14

申请号：US13079944

申请日：2011-04-05

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

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

IPC分类号： H04B7/02

CPC分类号： H04L27/2601 ,  H04L25/0202

摘要： A method for building a look-up table for a receiver in a multiple-input multiple-output (MIMO) detection system simulates a MIMO detector over many channel realizations, tracks channel metric and parameter values used for each channel realization resulting from such simulating, and stores, in a look-up table, best values of the tracked values used for a particular channel metric.

摘要翻译： 用于构建多输入多输出（MIMO）检测系统中的接收机的查找表的方法通过许多信道实现来模拟MIMO检测器，跟踪由这样的模拟产生的每个信道实现所使用的信道度量和参数值， 并且在查找表中存储用于特定信道度量的被跟踪值的最佳值。

公开(公告)号：US08023577B2

公开(公告)日：2011-09-20

申请号：US12024029

申请日：2008-01-31

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

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

IPC分类号： H04B17/00 ,  H04B3/46 ,  H04Q1/20

CPC分类号： H04L25/0204 ,  H04B7/0417 ,  H04B7/066 ,  H04L2025/03426

摘要： Embodiments provide a system and method for efficiently classifying different channel types in an orthogonal frequency division multiplexing (OFDM) system. Embodiments quantify the frequency selectivity in a channel by measuring the variation in a particular channel statistic across sub-carriers in an OFDM system, involve minimal complexity in implementation, and can be used in a variety of scenarios. One embodiment is a method for classifying channels in an OFDM system, comprising measuring variation of at least one channel statistic across sub-carriers, quantifying the variation to determine a measurement value, and applying the measurement value to at least one threshold to classify the channel.

摘要翻译： 实施例提供了一种用于在正交频分复用（OFDM）系统中有效地分类不同信道类型的系统和方法。 实施例通过测量OFDM系统中跨子载波的​​特定信道统计量的变化来量化信道中的频率选择性，涉及实现中的最小复杂度，并且可以用于各种情况。 一个实施例是一种用于对OFDM系统中的信道进行分类的方法，包括测量跨越子载波的至少一个信道统计量的变化，量化变化以确定测量值，以及将测量值应用于至少一个阈值以对信道进行分类 。

公开(公告)号：US07945008B2

公开(公告)日：2011-05-17

申请号：US12032309

申请日：2008-02-15

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

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

IPC分类号： H04L7/00

CPC分类号： H04L25/03242 ,  H04L27/2647 ,  H04L2025/03426

摘要： Embodiments provide systems and methods for improved multiple-input, multiple-output (MIMO) detection comprising generating at least one list of candidate vectors by employing lattice enumeration which approximates hyperellipsoid detection search space and calculating a reliability of the candidate vectors. At least one advantage to embodiments is that improved detection occurs because detection can be performed in a search space defined by the eigenvectors (which define the general shape of an ellipsoid/hyperellipsoid, depending upon number of dimensions) and eigenvalues (which provide the appropriate scaling in each direction of the eigenvectors) of the effective channel.

摘要翻译： 实施例提供了用于改进多输入多输出（MIMO）检测的系统和方法，包括通过采用接近超声检测搜索空间并计算候选向量的可靠性的点阵列表来生成候选向量的至少一个列表。 对于实施例的至少一个优点是发生改进的检测，因为检测可以在由特征向量定义的搜索空间中执行（其定义为椭圆体的一般形状/取决于维数）和特征值（其提供适当的缩放 在特征向量的每个方向上）有效信道。

公开(公告)号：US20080181322A1

公开(公告)日：2008-07-31

申请号：US12022307

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： H04L27/28 ,  G06F17/16

CPC分类号： H04L25/03006 ,  H04L2025/03414 ,  H04L2025/03426 ,  H04L2025/03605

摘要： Embodiments provide systems and methods for a novel multiple-input multiple-output (MIMO) equalization technique that produces a channel matrix that contains partly real coefficients and partly complex coefficients, referred to herein as a hybrid-MIMO equalization. MIMO detectors can exploit the hybrid-MIMO equalization to reduce complexity. Some embodiments provide systems and methods for equalizing a communication channel comprising receiving as an input a channel output vector, dividing the input into two vectors, a first vector that remains a complex number and a second vector that contains only real numbers, separating the second vector into its real and imaginary components, and regrouping the first and second vectors into a hybrid channel output vector that contains both real and complex coefficients.

摘要翻译： 实施例提供了一种新颖的多输入多输出（MIMO）均衡技术的系统和方法，其产生包含部分实系数和部分复系数的信道矩阵，这里称为混合MIMO均衡。 MIMO检测器可以利用混合MIMO均衡来降低复杂度。 一些实施例提供用于均衡通信信道的系统和方法，包括：接收作为输入的信道输出向量，将输入划分成两个向量，保留复数的第一向量和仅包含实数的第二向量，将第二向量 转换成其实部和虚部，并将第一和第二矢量重新分组成包含实数和复系数的混合信道输出向量。

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。

公开(公告)号：US08392781B2

公开(公告)日：2013-03-05

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： G08C25/02 ,  H03M13/00

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：US08306139B2

公开(公告)日：2012-11-06

申请号：US12016921

申请日：2008-01-18

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

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

IPC分类号： H04B7/02

CPC分类号： H04L27/2601 ,  H04L25/0202

摘要： Systems and methods for providing multiple-input multiple-output (MIMO) detection, comprising a leaf node predictor for receiving a processed communications stream, computing at least one channel metric corresponding to the communications stream for a given channel realization, and generating at least one parameter corresponding to at least one predicted best leaf node candidate for the given channel realization. A MIMO engine receives the at least one parameter and enumerates at least one list of candidate vectors corresponding to the leaf nodes specified by the generated at least one parameter. Some embodiments simulate a MIMO detector over many channel realizations, track channel metric and parameter values used for each channel realization resulting from such simulating, and store, in a look-up table, best values of the tracked values used for a particular channel metric.

摘要翻译： 用于提供多输入多输出（MIMO）检测的系统和方法，包括用于接收经处理的通信流的叶节点预测器，为给定的信道实现计算对应于通信流的至少一个信道度量，以及生成至少一个 参数对应于给定信道实现的至少一个预测的最佳叶节点候选。 MIMO引擎接收所述至少一个参数，并且列举与由所生成的至少一个参数指定的叶节点相对应的候选向量的至少一个列表。 一些实施例通过许多信道实现来模拟MIMO检测器，跟踪信道度量和用于每个信道实现的参数值，由这样的模拟和存储在查找表中，用于特定信道度量的跟踪值的最佳值。

公开(公告)号：US07961826B2

公开(公告)日：2011-06-14

申请号：US11928863

申请日：2007-10-30

申请人： Deric W. Waters ,  Oren Peles ,  Anuj Batra ,  Srinath Hosur ,  Doron Burshtein

发明人： Deric W. Waters ,  Oren Peles ,  Anuj Batra ,  Srinath Hosur ,  Doron Burshtein

IPC分类号： H04B7/10 ,  H04L1/02

CPC分类号： H04L25/03242 ,  H04L2025/03414 ,  H04L2025/03426

摘要： A Multiple-input Multiple-Output (MIMO) receiver is provided. The MIMO receiver comprises a parameterized sphere detector having two search modes. During a first search mode, the parameterized sphere detector enumerates a number of best candidate vectors up to a fixed parameter value. During a second search mode, the parameterized sphere detector enumerates additional candidate vectors using a greedy search until a predetermined number of candidate vectors have been enumerated.

摘要翻译： 提供多输入多输出（MIMO）接收机。 MIMO接收机包括具有两个搜索模式的参数化球体检测器。 在第一搜索模式期间，参数化球体检测器枚举多达一个固定参数值的最佳候选向量。 在第二搜索模式期间，参数化球体检测器使用贪婪搜索枚举附加候选向量，直到已经列举了预定数量的候选向量。