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：US20060039489A1

公开(公告)日：2006-02-23

申请号：US11182083

申请日：2005-07-15

申请人： Muhammad Ikram ,  Eko Onggosanusi ,  Vasanthan Raghavan ,  Anand Dabak ,  Srinath Hosur ,  Badrinarayanan Varadarajan

发明人： Muhammad Ikram ,  Eko Onggosanusi ,  Vasanthan Raghavan ,  Anand Dabak ,  Srinath Hosur ,  Badrinarayanan Varadarajan

IPC分类号： H04K1/10 ,  H04L27/04 ,  H04L1/02

CPC分类号： H04B7/0663 ,  H04B7/0634 ,  H04B7/0639 ,  H04L5/0023 ,  H04L5/0046 ,  H04L5/006 ,  H04L25/0204 ,  H04L25/0248 ,  H04L25/03343 ,  H04L2025/03414 ,  H04L2025/03426 ,  H04L2025/03802

摘要： A method for providing closed-loop transmit precoding between a transmitter and a receiver, includes defining a codebook that includes a set of unitary rotation matrices. The receiver determines which preceding rotation matrix from the codebook should be used for each sub-carrier that has been received. The receiver sends an index to the transmitter, where the transmitter reconstructs the precoding rotation matrix using the index, and precodes the symbols to be transmitted using the preceding rotation matrix. An apparatus that employs this closed-loop technique is also described.

摘要翻译： 一种用于在发射机和接收机之间提供闭环发射预编码的方法，包括定义包括一组单位旋转矩阵的码本。 接收机确定来自码本的哪个先前的旋转矩阵应该被用于已经被接收的每个子载波。 接收机向发射机发送索引，其中发射机使用索引重构预编码旋转矩阵，并且使用前一个旋转矩阵对要发送的符号进行预编码。 还描述了采用该闭环技术的装置。

公开(公告)号：US08040986B2

公开(公告)日：2011-10-18

申请号：US10723215

申请日：2003-11-26

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

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

IPC分类号： H04B7/10 ,  H04L1/02

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： 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，无线设备通过该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向量，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：US20060018410A1

公开(公告)日：2006-01-26

申请号：US10899615

申请日：2004-07-26

申请人： Eko Onggosanusi ,  Anand Dabak ,  Srinath Hosur

发明人： Eko Onggosanusi ,  Anand Dabak ,  Srinath Hosur

IPC分类号： H03D1/00

CPC分类号： H04L25/0204 ,  H04B7/0434 ,  H04B7/0854 ,  H04L2025/03547

摘要： In a wireless MIMO system, a multimode detector selects detection mode by channel estimation: ill-conditioned channels trigger use of high performance detection, whereas well-behaved channels lead to low complexity detection. Detection modes typically include maximum likelihood, minimum mean squared error, zero forcing, and so forth.

摘要翻译： 在无线MIMO系统中，多模式检测器通过信道估计选择检测模式：不良条件的信道触发使用高性能检测，而良好的信道导致检测低复杂度。 检测模式通常包括最大似然，最小均方误差，零强迫等。

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：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：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：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：US20060222099A1

公开(公告)日：2006-10-05

申请号：US11389354

申请日：2006-03-23

申请人： Badri Varadarajan ,  Anand Dabak ,  Charles Sestok ,  Srinath Hosur

发明人： Badri Varadarajan ,  Anand Dabak ,  Charles Sestok ,  Srinath Hosur

IPC分类号： H04L27/06 ,  H04K1/10

CPC分类号： H04L25/0216 ,  H04L27/2662 ,  H04L2025/03414

摘要： A method of estimating a channel length (304) in a wireless receiver is disclosed. The receiver receives a signal (122) from a remote transmitter. The receiver selects a plurality (K) of different candidate channel lengths and determines a respective criterion value (402) of the signal for each of the plurality of different candidate channel lengths. The receiver selects a channel length (410) from the plurality of different candidate channel lengths in response to the respective criterion value (404).

摘要翻译： 公开了一种在无线接收机中估计信道长度（304）的方法。 接收机从远程发射机接收信号（122）。 接收机选择不同候选信道长度的多个（K），并且为多个不同候选信道长度中的每一个确定信号的相应标准值（402）。 接收机响应于各自的标准值（404）从多个不同候选信道长度中选择一个信道长度（410）。

公开(公告)号：US20060280230A1

公开(公告)日：2006-12-14

申请号：US11438149

申请日：2006-05-22

申请人： Anand Dabak ,  Sundararajan Sriram ,  Srinath Hosur

发明人： Anand Dabak ,  Sundararajan Sriram ,  Srinath Hosur

IPC分类号： H04B1/00

CPC分类号： H04B1/7083 ,  H04B1/70735 ,  H04J13/00 ,  H04J13/12

摘要： A wireless communication system. The system comprises transmitter circuitry (BST1), the transmitter circuitry comprising encoder circuitry (50) for transmitting a plurality of frames (FR). Each of the plurality of frames comprises a primary synchronization code (PCS) and a secondary synchronization code (SSC). The encoder circuitry comprises of circuitry (501) for providing the primary synchronization code in response to a first sequence (32). The encoder circuitry further comprises circuitry (502) for providing the secondary synchronization code in response to a second sequence (54) and a third sequence (56). The second sequence is selected from a plurality of sequences. Each of the plurality of sequences is orthogonal with respect to all other sequences in the plurality of sequences. The third sequence comprises a subset of bits from the first sequence.

摘要翻译： 无线通信系统。 该系统包括发射机电路（BST1），该发射机电路包括用于传输多个帧（FR）的编码器电路（50）。 多个帧中的每一个包括主同步码（PCS）和辅同步码（SSC）。 编码器电路包括用于响应于第一序列（32）提供主同步码的电路（50 1）。 编码器电路还包括用于响应于第二序列（54）和第三序列（56）提供辅助同步码的电路（50）。 第二序列从多个序列中选择。 多个序列中的每一个相对于多个序列中的所有其他序列是正交的。 第三序列包括来自第一序列的比特的子集。