公开(公告)号：US07724832B2

公开(公告)日：2010-05-25

申请号：US10857417

申请日：2004-05-27

申请人： Srinath Hosur ,  Jaiganesh Balakrishnan ,  Michael Polley ,  Manish Goel ,  Muhammad Ikram

发明人： Srinath Hosur ,  Jaiganesh Balakrishnan ,  Michael Polley ,  Manish Goel ,  Muhammad Ikram

IPC分类号： H04K1/10

CPC分类号： H04L27/2647 ,  H04L25/0204 ,  H04L25/067

摘要： In MIMO wireless communications employing LMMSE receiver, the symbols transmitted through a transmit antenna are estimated at the receiver in the presence of interference consisting of two main components: one due to the additive noise and the other due to (interfering) symbols transmitted via the remaining antennas. This has been shown to hamper the performance of a communication system resulting in incorrect symbol decisions, particularly at low SNR. IMMSE has been devised as a solution to cope with this problem; In IMMSE processing, the symbols sent via each transmit antenna are decoded iteratively. In each stage of processing, the received signal is updated by removing the contribution of symbols detected in the previous iterations. In principle, this reduces the additive interference in which the desired symbols are embedded in. Therefore, the interference level should reduce monotonically as one goes down in processing order. In a noisy environment, however, any incorrect decision made on a symbol in an iteration leaves its contribution in the updated received signal available for processing in the following iterations. Fortunately, if the level of interference is estimated and the soft bits are scaled appropriately by the estimated interference power, the performance of IMMSE receiver can be greatly improved. Preferred embodiments estimate the interference by computing the probability of error in decoding the symbols of the previous stage(s). The computation of decision error probability depends on the constellation size of transmitted symbols and introduces very little processing overhead.

摘要翻译： 在采用LMMSE接收机的MIMO无线通信中，在存在由两个主要部分组成的干扰的接收机处估计通过发射天线发射的符号：一个由于加性噪声而导致的，另一个是由于通过剩余的 天线。 已经显示出妨碍通信系统的性能，导致不正确的符号决定，特别是在低SNR下。 IMMSE已被设计为解决这个问题的办法; 在IMMSE处理中，经由每个发送天线发送的符号被迭代地解码。 在每个处理阶段，通过去除在先前迭代中检测到的符号的贡献来更新接收到的信号。 原则上，这降低了嵌入期望符号的附加干扰。因此，干扰电平在处理顺序下降时单调减少。 然而，在嘈杂的环境中，在迭代中对符号做出的任何不正确的决定使其在更新的接收信号中的贡献可用于在以下迭代中进行处理。 幸运的是，如果估计干扰水平，并通过估计的干扰功率适当地缩放软比特，则可以大大提高IMMSE接收机的性能。 优选实施例通过计算解码前一级的符号的误差概率来估计干扰。 决策误差概率的计算取决于传输符号的星座大小，并引入很少的处理开销。

公开(公告)号：US20050163041A1

公开(公告)日：2005-07-28

申请号：US10765009

申请日：2004-01-26

申请人： Muhammad Ikram ,  Srinath Hosur ,  Michael Polley ,  Manish Goel

发明人： Muhammad Ikram ,  Srinath Hosur ,  Michael Polley ,  Manish Goel

IPC分类号： H04B1/707 ,  H04B7/02 ,  H04J11/00 ,  H04L27/26

CPC分类号： H04B7/02 ,  H04B1/7105 ,  H04B1/7107 ,  H04L1/0631 ,  H04L1/0656 ,  H04L27/2647

摘要： A Hybrid IMMSE-LMMSE receiver processing technique predicts performance of and selects between iterative and non-iterative decoding of symbols based on an intelligent metric. Based on a pre-specified criterion, the receiver determines if a correct first-stage decision is made or not. If a correct decision is made, then it follows iterative processing like in BLAST. Alternatively, if a wrong decision is found to have occurred, the receiver resorts to LMMSE estimation processing.

摘要翻译： 混合IMMSE-LMMSE接收机处理技术基于智能度量预测符号的迭代和非迭代解码之间的性能并进行选择。 根据预先指定的标准，接收机确定是否做出正确的第一阶段决定。 如果做出正确的决定，那么它将像BLAST一样进行迭代处理。 或者，如果发现错误的决定已经发生，接收机将采用LMMSE估计处理。

公开(公告)号：US20050265465A1

公开(公告)日：2005-12-01

申请号：US10857417

申请日：2004-05-27

申请人： Srinath Hosur ,  Jaiganesh Balakrishnan ,  Muhammed Ikram ,  Manish Goel ,  Michael Polley

发明人： Srinath Hosur ,  Jaiganesh Balakrishnan ,  Muhammed Ikram ,  Manish Goel ,  Michael Polley

IPC分类号： H03D1/00 ,  H04B7/02 ,  H04B7/10 ,  H04L25/02 ,  H04L25/06 ,  H04L27/06 ,  H04L27/26

CPC分类号： H04L27/2647 ,  H04L25/0204 ,  H04L25/067

摘要： In MIMO wireless communications employing LMMSE receiver, the symbols transmitted through a transmit antenna are estimated at the receiver in the presence of interference consisting of two main components: one due to the additive noise and the other due to (interfering) symbols transmitted via the remaining antennas. This has been shown to hamper the performance of a communication system resulting in incorrect symbol decisions, particularly at low SNR. IMMSE has been devised as a solution to cope with this problem; In IMMSE processing, the symbols sent via each transmit antenna are decoded iteratively. In each stage of processing, the received signal is updated by removing the contribution of symbols detected in the previous iterations. In principle, this reduces the additive interference in which the desired symbols are embedded in. Therefore, the interference level should reduce monotonically as one goes down in processing order. In a noisy environment, however, any incorrect decision made on a symbol in an iteration leaves its contribution in the updated received signal available for processing in the following iterations. Fortunately, if the level of interference is estimated and the soft bits are scaled appropriately by the estimated interference power, the performance of IMMSE receiver can be greatly improved. Preferred embodiments estimate the interference by computing the probability of error in decoding the symbols of the previous stage(s). The computation of decision error probability depends on the constellation size of transmitted symbols and introduces very little processing overhead.

摘要翻译： 在采用LMMSE接收机的MIMO无线通信中，在存在由两个主要部分组成的干扰的接收机处估计通过发射天线发射的符号：一个由于加性噪声而导致的，另一个是由于通过剩余的 天线。 已经显示出妨碍通信系统的性能，导致不正确的符号决定，特别是在低SNR下。 IMMSE已被设计为解决这个问题的办法; 在IMMSE处理中，经由每个发送天线发送的符号被迭代地解码。 在每个处理阶段，通过去除在先前迭代中检测到的符号的贡献来更新接收到的信号。 原则上，这降低了嵌入期望符号的附加干扰。因此，干扰电平在处理顺序下降时单调减少。 然而，在嘈杂的环境中，在迭代中对符号做出的任何不正确的决定使其在更新的接收信号中的贡献可用于在以下迭代中进行处理。 幸运的是，如果估计干扰水平，并通过估计的干扰功率适当地缩放软比特，则可以大大提高IMMSE接收机的性能。 优选实施例通过计算解码前一级的符号的误差概率来估计干扰。 决策误差概率的计算取决于传输符号的星座大小，并引入很少的处理开销。

公开(公告)号：US20050171987A1

公开(公告)日：2005-08-04

申请号：US10919873

申请日：2004-08-17

申请人： Manish Goel ,  David Milliner ,  Srinath Hosur ,  Muhammad Ikram

发明人： Manish Goel ,  David Milliner ,  Srinath Hosur ,  Muhammad Ikram

IPC分类号： G06F7/38 ,  H04B7/04 ,  H04L25/02

CPC分类号： H04B7/0413 ,  H04L25/024

摘要： The present invention provides a folded low-complexity (FLC) pipeline. In one embodiment, the FLC pipeline includes a dot product unit chain configured to employ only addition and multiplication operations to compute intermediate numerators and denominators from a received signal matrix, a channel gain matrix and a noise matrix. Additionally, FLC pipeline also includes a divider stage configured to terminate the dot product unit chain by computing an unscaled quotient and a scale factor from ultimate ones of the intermediate numerators and denominators.

摘要翻译： 本发明提供了一种折叠的低复杂度（FLC）流水线。 在一个实施例中，FLC流水线包括点积单位链，其被配置为仅采用加法和乘法运算来从接收信号矩阵，信道增益矩阵和噪声矩阵计算中间分子和分母。 另外，FLC管线还包括分配器级，其被配置为通过计算未经缩放的商和从最终的中间分子和分母的比例因子来终止点积单位链。

公开(公告)号：US20050113041A1

公开(公告)日：2005-05-26

申请号：US10723215

申请日：2003-11-26

申请人： Michael Polley ,  Donald Shaver ,  Srinath Hosur ,  Eko Onggosanusi ,  Muhammad Ikram ,  Anand Dabak

发明人： Michael Polley ,  Donald Shaver ,  Srinath Hosur ,  Eko Onggosanusi ,  Muhammad Ikram ,  Anand Dabak

IPC分类号： H04B7/005 ,  H04B1/02

CPC分类号： H04W52/42

摘要： A system comprises a wireless device that communicates across a spectrum having a plurality of sub-channels. The wireless device comprises a plurality of antennas through which the wireless device communicates with another wireless device, wherein each antenna communicates with the other wireless device via an associated communication pathway. The wireless device further comprises sub-channel power analysis logic coupled to the antennas and adapted to determine which communication pathway has the highest communication quality on a sub-channel by sub-channel basis. The wireless device still further comprises diversity selection logic coupled to the sub-channel power analysis logic and adapted to determine a weighting vector for an associated antenna based on the communication quality, wherein the weighting vector specifies a relative transmission power for each sub-channel for the associated antenna.

摘要翻译： 一种系统包括在具有多个子信道的频谱上进行通信的无线设备。 无线设备包括多个天线，无线设备通过多个天线与另一无线设备通信，其中每个天线经由相关联的通信路径与另一无线设备进行通信。 无线设备还包括耦合到天线的子信道功率分析逻辑，并且适于通过子信道来确定子信道上哪个通信路径具有最高通信质量。 无线设备还包括耦合到子信道功率分析逻辑的分集选择逻辑，并且适于基于通信质量来确定相关天线的加权矢量，其中加权向量规定每个子信道的相对发射功率，用于 相关天线。

公开(公告)号：US20060007908A1

公开(公告)日：2006-01-12

申请号：US10884363

申请日：2004-07-02

申请人： Srinath Hosur ,  Michael Polley ,  Manish Goel

发明人： Srinath Hosur ,  Michael Polley ,  Manish Goel

IPC分类号： H04J3/06 ,  H04L12/28

CPC分类号： H04L1/0083 ,  H04B7/0678 ,  H04L7/041 ,  H04L7/06 ,  H04L27/2613

摘要： A device and a method of characterizing a communications channel. The method includes transmitting a first part of a packet preamble using two or more antennas and transmitting a second part of the packet preamble using the two or more antennas. Each antenna transmits an orthogonal encoding of the second part of the packet preamble. The method also includes transmitting a packet header using the two or more antennas and transmitting a packet payload using the two or more antennas. Each antenna transmits an orthogonal encoding of the packet header. The packet payload may be encoded across the transmissions of the two or more antennas.

公开(公告)号：US20050044472A1

公开(公告)日：2005-02-24

申请号：US10643119

申请日：2003-08-18

申请人： Xiaolin Lu ,  Srinath Hosur ,  Manish Goel ,  Michael Polley

发明人： Xiaolin Lu ,  Srinath Hosur ,  Manish Goel ,  Michael Polley

IPC分类号： H03M13/00 ,  H04B1/38 ,  H04L7/04 ,  H04L7/10

CPC分类号： H04W56/009 ,  H04L7/048 ,  H04L7/10 ,  H04W24/00 ,  H04W74/00

摘要： A resynchronization method for use in a data communication system having a first device configured to transmit data at a symbol rate to a second device. The second device includes a Reed Solomon (RS) decoder having a RS lock indicator and a Moving Picture Experts Group (MPEG) Protocol Interface (MPI) having a MPI lock indicator, wherein the RS and the MPI lock indicators are monitored. Four different states, defined by the values of the RS and MPI lock indicators, determine whether the data communication system will wait for the RS decoder and the MPI hardware block to resynchronize, whether an intermediate-subset of the channel acquisition algorithm is performed or whether the entire channel acquisition algorithm is performed. The method for resynchronization described herein recovers synchronization within a predetermined time without the layers above the physical link layer having knowledge.

摘要翻译： 一种用于具有第一设备的数据通信系统中的再同步方法，该第一设备被配置为以符号速率向第二设备发送数据。 第二装置包括具有RS锁定指示器的里德所罗门（RS）解码器和具有MPI锁定指示器的运动图像专家组（MPEG）协议接口（MPI），其中监测RS和MPI锁定指示符。 由RS和MPI锁指示符的值定义的四种不同状态确定数据通信系统是否将等待RS解码器和MPI硬件块重新同步，无论是执行信道获取算法的中间子集还是执行 执行整个信道获取算法。 本文所述的用于重新同步的方法在预定时间内恢复同步，而不具有物理链路层之上的层具有知识。

公开(公告)号：US20070089042A1

公开(公告)日：2007-04-19

申请号：US11470916

申请日：2006-09-07

申请人： Xiaolin Lu ,  Srinath Hosur ,  Manish Goel ,  Michael Polley

发明人： Xiaolin Lu ,  Srinath Hosur ,  Manish Goel ,  Michael Polley

IPC分类号： H03M13/00

CPC分类号： H04W56/009 ,  H04L7/048 ,  H04L7/10 ,  H04W24/00 ,  H04W74/00

摘要： A resynchronization method for use in a data communication system having a first device configured to transmit data at a symbol rate to a second device. The second device includes a Reed Solomon (RS) decoder having a RS lock indicator and a Moving Picture Experts Group (MPEG) Protocol Interface (MPI) having a MPI lock indicator, wherein the RS and MPI lock indicators are monitored. Four different states, defined by the values of the RS and MPI lock indicators, determine whether the data communication system will wait for the RS decoded and the MPI hardware block to resynchronize, whether an intermediate-subset of the channel acquisition algorithm is performed or whether the entire channel acquisition algorithm is performed. The method of resynchronization described herein recovers synchronization within a predetermined time without the layers above the physical link layer having knowledge.

摘要翻译： 一种用于具有第一设备的数据通信系统中的再同步方法，该第一设备被配置为以符号速率向第二设备发送数据。 第二装置包括具有RS锁指示器的Reed Solomon（RS）解码器和具有MPI锁定指示器的运动图像专家组（MPEG）协议接口（MPI），其中监视RS和MPI锁定指示符。 由RS和MPI锁指示器的值定义的四种不同状态确定数据通信系统是否将等待RS解码和MPI硬件块重新同步，无论是执行信道获取算法的中间子集还是执行 执行整个信道获取算法。 本文所述的重新同步的方法在预定时间内恢复同步，而不具有具有知识的物理链路层之上的层。

公开(公告)号：US20050136935A1

公开(公告)日：2005-06-23

申请号：US10744310

申请日：2003-12-22

申请人： Srinath Hosur ,  Srikanth Gummadi ,  Michael Polley ,  Manish Goel

发明人： Srinath Hosur ,  Srikanth Gummadi ,  Michael Polley ,  Manish Goel

IPC分类号： H04Q7/20

CPC分类号： H04B7/0689 ,  H04B7/04

摘要： For use with a multiple-input, multiple-output (MIMO) transmitter, a signal field controller, a method of controlling signal fields and a MIMO transmitter incorporating the controller or the method. In one embodiment, the controller includes: (1) a primary signal field mode indicator configured to cause a primary signal field to indicate a presence of a supplemental signal field and provide the primary signal field to the MIMO transmitter for transmission thereby and (2) a supplemental signal field generator coupled to the primary signal field mode indicator and configured to provide a supplemental signal field to the MIMO transmitter for further transmission thereby only when the primary signal field indicates the presence.

摘要翻译： 用于多输入多输出（MIMO）发射机，信号场控制器，控制信号场的方法和包含控制器或方法的MIMO发射机。 在一个实施例中，控制器包括：（1）主信号场模式指示器，其被配置为使主信号域指示补充信号场的存在，并将主信号字段提供给MIMO发射机用于传输，以及（2） 辅助信号场发生器，其耦合到主信号场模式指示符并且被配置为仅在主信号字段指示存在时向MIMO发射机提供补充信号字段以进一步发送。

公开(公告)号：US20080310538A1

公开(公告)日：2008-12-18

申请号：US12198630

申请日：2008-08-26

申请人： Srinath Hosur ,  Jaiganesh Balakrishnan ,  Anuj Batra

发明人： Srinath Hosur ,  Jaiganesh Balakrishnan ,  Anuj Batra

IPC分类号： H04L27/28

CPC分类号： H04L27/2602 ,  H04B1/7176

摘要： The present invention provides a versatile system for selectively spreading carrier data across multiple carrier paths within an Orthogonal Frequency Division Multiplexing (OFDM) system (200), particularly an ultra-wideband (UWB) system. The present invention provides a data input (202), which passes data to a randomizer (204). The data then passes to a convolutional code function (206), the output of which is punctured by puncturing function (208). An interleaver function (210) receives the punctured code data, and cooperatively operates with a mapper element (218) to prepare the coded data for pre-transmission conversion by an IFFT (220). The mapper element (218) comprises a dual carrier modulation function (216), which associates and transforms two punctured code data elements into a format for transmission on two separate signal tones.

摘要翻译： 本发明提供了一种通用系统，用于在正交频分复用（OFDM）系统（200），特别是超宽带（UWB）系统内的多个载波路径上选择性地扩展载波数据。 本发明提供一种将数据传递给随机发生器（204）的数据输入（202）。 数据然后传递到卷积码功能（206），其输出被穿孔功能（208）打孔。 交织器功能（210）接收穿孔码数据，并与映射器元件（218）协作操作，以通过IFFT（220）准备用于预传输转换的编码数据。 映射器元件（218）包括双载波调制功能（216），其将两个穿孔码数据元素相关联并变换为用于在两个分离的信号音调上传输的格式。