公开(公告)号：US20080181323A1

公开(公告)日：2008-07-31

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： H04L27/28 ,  H04B1/10

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：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：US20080181321A1

公开(公告)日：2008-07-31

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： H04L27/28

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：US20080144746A1

公开(公告)日：2008-06-19

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： H04L27/06 ,  H03D1/00

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。

公开(公告)号：US08593343B2

公开(公告)日：2013-11-26

申请号：US13227141

申请日：2011-09-07

申请人： Deric W. Waters ,  June Chul Roh ,  Sandeep Rao

发明人： Deric W. Waters ,  June Chul Roh ,  Sandeep Rao

IPC分类号： G01S19/23

CPC分类号： G01S19/26 ,  G01S19/05 ,  G01S19/235 ,  G01S19/246 ,  G01S19/254

摘要： Embodiments of the invention provide a method of adjusting a bandwidth of receivers. A plurality of outputs from a correlator engine are combined. User dynamics are sensed. Bandwidth of one or more receivers are adjusted. By detecting when the user is stationary, the Doppler frequency estimation can be corrected or the SNR can be boosted more both of which lead to improved performance. The embodiments allow a receiver to process signals in when the signal level would otherwise be too low—for example indoors. The embodiments can improve performance when one or more satellites are temporarily blocked but one or more satellites are still being tracked.

摘要翻译： 本发明的实施例提供了一种调整接收机带宽的方法。 来自相关器引擎的多个输出被组合。 感应用户动态。 调整一个或多个接收器的带宽。 通过检测用户何时静止，可以校正多普勒频率估计或更多地提高SNR，这两者都可以提高性能。 这些实施例允许接收机在信号电平否则将太低时处理信号，例如室内。 当一个或多个卫星被暂时阻塞但仍在跟踪一个或多个卫星时，这些实施例可以提高性能。

公开(公告)号：US20130293416A1

公开(公告)日：2013-11-07

申请号：US13462386

申请日：2012-05-02

申请人： Deric W. WATERS ,  Jayawardan JANARDHANAN

发明人： Deric W. WATERS ,  Jayawardan JANARDHANAN

IPC分类号： G01S19/48

CPC分类号： G01S19/48 ,  G01S5/0252 ,  G01S5/0263 ,  G01S5/14 ,  G01S19/03 ,  G01S19/46

摘要： Apparatus and method for positioning a wireless device. In one embodiment, a method for indoor positioning includes determining a reference location of a wireless device, based on satellite positioning, as the device passes between areas of satellite positioning signal reception and satellite positioning signal non-reception. While in the areas of non-reception, signals transmitted by wireless local area network (WLAN) access points (APs) and parameters of motion of the device are measured. Positions of the device are estimated while in the areas of non-reception based on the reference location and the parameters of motion. A positioning grid for positioning is generated based on the signals measured by the wireless device at the estimated positions.

摘要翻译： 用于定位无线设备的装置和方法。 在一个实施例中，一种用于室内定位的方法包括当卫星定位信号接收和卫星定位信号不接收的区域之间经过卫星定位时，确定无线设备的参考位置。 在不接收的区域中，测量由无线局域网（WLAN）接入点（AP）发送的信号和设备的运动参数。 在基于参考位置和运动参数的不接收的区域中估计设备的位置。 基于由无线设备在估计位置测量的信号产生用于定位的定位网格。

公开(公告)号：US08233556B2

公开(公告)日：2012-07-31

申请号：US11776215

申请日：2007-07-11

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

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

IPC分类号： H04K1/10

CPC分类号： H04B7/0617 ,  H01Q3/2605 ,  H04B7/0417 ,  H04B7/0634 ,  H04B7/0663 ,  H04L1/06

摘要： A method and system for reduced feedback transmit beamforming computes a matrix of channel transfer function coefficients. The matrix of channel transfer function coefficients is compressed by applying a rotation matrix having orthogonal columns to the matrix of channel transfer function coefficients to produce a compressed transfer function matrix having a reduced number of non-zero coefficients. The compressed matrix is fed back to a transmitting unit. Decompression of the transfer function coefficient matrix is not required. This compression does not cause any performance degradation for transmit beamforming. The transmitting unit computes a set of beamsteering coefficients from the compressed matrix and applies the coefficients to signals prior to transmission. The beamformed signals are transmitted to the receiving unit and post-coded to allow the receiving unit to see an effective diagonalized channel.

摘要翻译： 用于减少反馈传输波束成形的方法和系统计算信道传递函数系数的矩阵。 通过将具有正交列的旋转矩阵应用于信道传递函数系数的矩阵来压缩信道传递函数系数的矩阵，以产生具有减少的非零系数数的压缩传递函数矩阵。 压缩矩阵被反馈到发送单元。 不要求传递函数系数矩阵的解压缩。 这种压缩不会对发射波束成形造成任何性能下降。 发送单元从压缩矩阵计算一组波束导向系数，并将该系数应用于发送之前的信号。 波束形成的信号被发送到接收单元并进行后编码以允许接收单元看到有效的对角化信道。

公开(公告)号：US08155217B2

公开(公告)日：2012-04-10

申请号：US12016967

申请日：2008-01-18

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

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

IPC分类号： H04K1/10

CPC分类号： H04L27/2601 ,  H04B7/0413 ,  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 by optimizing a predetermined probability, and analytically generating at least one parameter to output, which at least one parameter corresponds to at least one predicted best leaf node candidate for the given channel realization. The leaf-node predictor may generate, in real-time and without using a look-up table, at least one parameter directly from a given channel metric. Some embodiments analytically generate at least one parameter value for use by a MIMO detector corresponding to a channel metric and store the generated at least one parameter value and corresponding channel metric in a look-up table.

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，通过优化预定概率来计算与所述通信流相对应的至少一个信道度量用于给定信道实现， 并且分析地生成至少一个要输出的参数，所述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。 叶节点预测器可以实时地和不使用查找表来生成直接来自给定信道度量的至少一个参数。 一些实施例分析地生成至少一个参数值，供由MIMO信号检测器对应于信道度量使用，并将生成的至少一个参数值和对应的信道度量存储在查找表中。

公开(公告)号：US20120068883A1

公开(公告)日：2012-03-22

申请号：US13306038

申请日：2011-11-29

申请人： Ariton E. Xhafa ,  Deric W. Waters

发明人： Ariton E. Xhafa ,  Deric W. Waters

IPC分类号： G01S19/42 ,  G01S19/21

CPC分类号： G01S19/21

摘要： A method for operating a wireless transmitter and a global navigation satellite (“GNSS”) receiver coexistent in a mobile wireless device. A mobile wireless device includes a GNSS receiver and a wireless networking system. The wireless networking system includes a wireless transmitter. The wireless transmitter provides a first interference level signal to the GNSS receiver. The first interference level signal indicates a level of interference that the GNSS receiver can expect due to operation of the transmitter. A priority signal is asserted if the processing of navigation signals in the GNSS receiver takes precedence over wireless transmitter transmissions.

摘要翻译： 一种用于操作在移动无线设备中共存的无线发射机和全球导航卫星（“GNSS”）接收机的方法。 移动无线设备包括GNSS接收机和无线联网系统。 无线网络系统包括无线发射机。 无线发射机向GNSS接收机提供第一干扰电平信号。 第一干扰电平信号指示GNSS接收机由于发射机的操作而能够预期的干扰水平。 如果GNSS接收机中的导航信号的处理优先于无线发射机传输，则优先信号被断言。

公开(公告)号：US08045632B2

公开(公告)日：2011-10-25

申请号：US12099308

申请日：2008-04-08

申请人： Anuj Batra ,  Deric W. Waters

发明人： Anuj Batra ,  Deric W. Waters

IPC分类号： H04K1/10 ,  H04L27/28

CPC分类号： H04B1/7176 ,  H04L27/2602

摘要： Systems and methods for dual-carrier modulation (DCM) encoding and decoding for communication systems. Some embodiments comprise a DCM encoder for applying a pre-transmission function to at least one 16-QAM input symbol and mapping resulting transformed symbols onto at least one larger constellation prior to transmission. Some embodiments joint decode, by a DCM decoder, a predetermined number of received data elements and compute a set of log-likelihood ratio (LLR) values for at least eight bits from a resulting at least one transformed symbol.

摘要翻译： 用于通信系统的双载波调制（DCM）编码和解码的系统和方法。 一些实施例包括DCM编码器，用于将预传输功能应用于至少一个16-QAM输入符号，并且在传输之前将所得到的变换符号映射到至少一个较大星座上。 一些实施例由DCM解码器联合解码预定数量的接收数据元素，并从所得到的至少一个变换符号计算至少八位的对数似然比（LLR）值集合。