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：US20050245199A1

公开(公告)日：2005-11-03

申请号：US11062729

申请日：2005-02-22

申请人： Anuj Batra ,  Nathan Belk ,  Anand Dabak ,  Michael DiRenzo ,  Manish Goel ,  Jin-Meng Ho ,  Srinath Hosur ,  Xiaolin Lu ,  David Magee ,  Donald Shaver ,  Hirohisa Yamaguchi

发明人： Anuj Batra ,  Nathan Belk ,  Anand Dabak ,  Michael DiRenzo ,  Manish Goel ,  Jin-Meng Ho ,  Srinath Hosur ,  Xiaolin Lu ,  David Magee ,  Donald Shaver ,  Hirohisa Yamaguchi

IPC分类号： H04B1/38

摘要： A wireless transceiver 10 is provided that includes a configurable analog component 14 and a controller portion 18. The configurable analog component 14 is operable to receive an input radio frequency signal and to transmit the output radio frequency signal. The controller portion 18 is operable to promote adjustment of a bandwidth of the configurable analog component 14 from at least a first bandwidth to a second bandwidth.

摘要翻译： 提供了一种无线收发机10，其包括可配置的模拟组件14和控制器部分18。 可配置模拟组件14可操作以接收输入射频信号并传输输出射频信号。 控制器部分18可操作以促进将可配置模拟组件14的带宽从至少第一带宽调整到第二带宽。

公开(公告)号：US06917311B2

公开(公告)日：2005-07-12

申请号：US10639418

申请日：2003-08-11

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

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

IPC分类号： H03M7/00 ,  H04B7/04 ,  H04L1/00 ,  H04L1/06 ,  H04L25/02 ,  H04L27/26

CPC分类号： H04L1/0078 ,  H04B7/04 ,  H04L1/06 ,  H04L25/0204 ,  H04L25/022 ,  H04L25/0226 ,  H04L27/2613

摘要： For use with a multiple-input, multiple-output (MIMO) transmitter, an orthogonal preamble encoder, a method of encoding orthogonal preambles and a communication system incorporating the encoder or the method. In one embodiment, the encoder includes: (1) a preamble supplement generator configured to provide a first long sequence preamble supplement to a first transmit antenna of the MIMO transmitter and (2) a preamble supplement coordinator coupled to the preamble supplement generator and configured to provide a second long sequence preamble supplement to a second transmit antenna of the MIMO transmitter, at least a portion of the second long sequence preamble supplement being a negation of the first long sequence preamble supplement.

摘要翻译： 用于多输入多输出（MIMO）发射机，正交前导码编码器，对正交前导码进行编码的方法和结合编码器的通信系统或方法。 在一个实施例中，所述编码器包括：（1）前导码补充生成器，被配置为向所述MIMO发射机的第一发射天线提供第一长序列前导码补充，以及（2）前缀补充协调器，其耦合到所述前导码补充生成器， 向所述MIMO发射机的第二发射天线提供第二长序列前导码补充，所述第二长序列前同步码补码的至少一部分是所述第一长序列前同步码补码的否定。

公开(公告)号：US09294316B2

公开(公告)日：2016-03-22

申请号：US13168180

申请日：2011-06-24

申请人： Timothy M. Schmidl ,  Anuj Batra

发明人： Timothy M. Schmidl ,  Anuj Batra

IPC分类号： H04L27/28 ,  H04L25/03 ,  H04L27/26

CPC分类号： H04W12/02 ,  H04L25/03866 ,  H04L27/2601

摘要： An integrated circuit includes logic configured to generate scrambling sequences, each based on a different scrambling seed, for a smart-utility-network data packet communication. A Hamming distance between any two scrambling sequences is half the length of a PSDU of the data packet or greater.

摘要翻译： 集成电路包括被配置为产生扰频序列的逻辑，每个加扰序列基于不同的加扰种子，用于智能公用事业网络数据分组通信。 任何两个加扰序列之间的汉明距离是数据分组的PSDU的长度的一半或更大。

公开(公告)号：US08503553B2

公开(公告)日：2013-08-06

申请号：US12961032

申请日：2010-12-06

申请人： Timothy M. Schmidl ,  Anuj Batra

发明人： Timothy M. Schmidl ,  Anuj Batra

IPC分类号： H04K1/10

CPC分类号： H04L5/0048 ,  H04L5/0007 ,  H04L25/0204 ,  H04L27/2613 ,  H04W4/80 ,  H04W48/08 ,  H04W84/10

摘要： An integrated circuit includes logic configured to encode pilot signals in a first set of subcarriers of an orthogonal frequency division multiplexing (“OFDM”) symbol and in a second set of subcarriers of a consecutive OFDM symbol. The symbol and the consecutive symbol are in the same smart-utility-network packet.

摘要翻译： 集成电路包括被配置为对正交频分复用（“OFDM”）符号的第一组子载波和连续OFDM符号的第二组子载波中的导频信号进行编码的逻辑。 符号和连续符号位于相同的智能公用网络数据包中。

公开(公告)号：US08649446B2

公开(公告)日：2014-02-11

申请号：US13284745

申请日：2011-10-28

申请人： Taejoon Kim ,  Timothy M. Schmidl ,  Tarkesh Pande ,  Anuj Batra ,  June Chul Roh

发明人： Taejoon Kim ,  Timothy M. Schmidl ,  Tarkesh Pande ,  Anuj Batra ,  June Chul Roh

IPC分类号： H04L27/00

CPC分类号： H04L25/0212 ,  H04L25/0216 ,  H04L25/0222 ,  H04L27/2601

摘要： A system and method for classifying a channel with regard to delay spread in a wireless network applying orthogonal frequency division multiplexing. In one embodiment, a wireless receiver includes a channel classifier. The channel classifier is configured to compute a channel estimate corresponding to a channel traversed by a packet received by the wireless receiver. The channel classifier is also configured to partition the channel estimate into a plurality of windows. Each window corresponds to a range of time of the channel estimate. The channel classifier is further configured to assign a delay spread classification to the channel based on a distribution of energy across the windows.

摘要翻译： 一种用于对采用正交频分复用的无线网络中的延迟扩展对信道进行分类的系统和方法。 在一个实施例中，无线接收机包括信道分类器。 信道分类器被配置为计算与由无线接收机接收的分组所经过的信道相对应的信道估计。 信道分类器还被配置为将信道估计分割成多个窗口。 每个窗口对应于信道估计的时间范围。 信道分类器还被配置为基于跨越窗口的能量分布向信道分配延迟扩展分类。

公开(公告)号：US08054742B2

公开(公告)日：2011-11-08

申请号：US12548300

申请日：2009-08-26

申请人： June Chul Roh ,  Anuj Batra

发明人： June Chul Roh ,  Anuj Batra

IPC分类号： H04J11/00 ,  H04B15/00

CPC分类号： H04L27/2634

摘要： A system and method for sidelobe suppression in OFDM communications systems is provided. A method for transmitting an information symbol having a plurality of information sub-carriers and a plurality of active interference cancellation (AIC) sub-carriers includes generating AIC sub-carrier data based on the information to be transmitted, populating the plurality of information sub-carriers with the information, populating the plurality of AIC sub-carriers with the AIC sub-carrier data, applying baseband processing to the information symbol, thereby producing a processed symbol, and transmitting the processed symbol.

摘要翻译： 提供了OFDM通信系统中用于旁瓣抑制的系统和方法。 一种用于发送具有多个信息子载波和多个主动干扰消除（AIC）子载波的信息符号的方法，包括：基于要发送的信息生成AIC子载波数据，填充多个信息子载波， 携带信息，用AIC子载波数据填充多个AIC子载波，对信息符号应用基带处理，从而产生处理后的符号，并发送处理后的符号。

公开(公告)号：US07957760B2

公开(公告)日：2011-06-07

申请号：US12508078

申请日：2009-07-23

申请人： Anuj Batra ,  Srinivas Lingam

发明人： Anuj Batra ,  Srinivas Lingam

IPC分类号： H04B1/00 ,  H04B7/00 ,  H04Q11/12

CPC分类号： H04W52/242 ,  H04W52/08 ,  H04W52/246 ,  H04W52/283 ,  H04W52/50

摘要： The distance between a first Multi Band Orthogonal Frequency Division Multiplex (MB-OFDM) data transceiver and a second or more such transceiver is determined using known techniques. The radio frequency path loss between transceivers is estimated given said distance, using a known relationship between distance and path loss, and further accounting for line-of-sight or non-line-of-sight conditions if desired. This path loss value is added to the typically minimum transmit power level, absent path loss, needed for reliable data communication. This modified initial transmit power level is then used by the first transceiver to begin the known iterative feedback process of transmit power control (TPC). Because this modified initial transmit power level, based on distance, is closer to the final optimum level, convergence in the TPC process occurs in fewer steps and less time than had the initial transmit power been maximum power as is typical in known TPC systems.

摘要翻译： 使用已知技术确定第一多频带正交频分复用（MB-OFDM）数据收发机与第二或更多个这样的收发机之间的距离。 使用距离和路径损耗之间的已知关系，给出所述距离估计收发器之间的射频路径损耗，并且如果需要，进一步考虑视线或非视距条件。 该路径损耗值被添加到可靠数据通信所需的通常最小发射功率电平，不存在路径损耗。 该修改的初始发射功率电平然后由第一收发器用于开始已知的发射功率控制（TPC）的迭代反馈处理。 由于这种基于距离的修改的初始发射功率电平更接近于最终的最优电平，所以在已知TPC系统中典型的情况下，TPC过程中的收敛在比初始发射功率达到最大功率的步骤少，时间更短的时间内发生。

公开(公告)号：US20110129032A1

公开(公告)日：2011-06-02

申请号：US13022746

申请日：2011-02-08

申请人： Anuj Batra ,  Deric W. Waters

发明人： Anuj Batra ,  Deric W. Waters

IPC分类号： H04L27/36

CPC分类号： 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。