公开(公告)号：US5968198A

公开(公告)日：1999-10-19

申请号：US699101

申请日：1996-08-16

申请人： Amer A. Hassan ,  Ali S. Khayrallah ,  Yi-Pin Eric Wang ,  Kumar Balachandran ,  Rajaram Ramesh

发明人： Amer A. Hassan ,  Ali S. Khayrallah ,  Yi-Pin Eric Wang ,  Kumar Balachandran ,  Rajaram Ramesh

IPC分类号： H04L1/00 ,  H03M13/09 ,  H03M13/13 ,  H03M13/15 ,  H03M13/29 ,  H03M13/37 ,  H03M13/45 ,  H04L1/16 ,  H04L1/18 ,  H04L25/06 ,  H03M13/00

CPC分类号： H04L25/067 ,  H03M13/13 ,  H03M13/27 ,  H03M13/2906 ,  H03M13/2933 ,  H03M13/3738 ,  H03M13/456 ,  H03M13/6306 ,  H04L1/0065 ,  H04L1/0071 ,  H03M13/09 ,  H03M13/6331 ,  H04L1/1809 ,  H04L1/1816

摘要： A coding system is disclosed wherein the receive side includes a decoder capable of producing, in addition to the hard information decoded output, either or both symbol and/or bit soft information values. For a certain information bit position, a value proportional to the joint probability that a received symbol and the set of all hypothesized transmitted codewords that led to the estimated or detected hard information output is calculated. The calculated probabilities with respect to plural codewords having a zero in that certain information bit position are compared to the calculated probabilities with respect to the plural codewords having a one in that certain information bit position. The result of the comparison provides an indication of whether the hard information output in that same information bit position is more likely a one or a zero. The output soft information values are further processed in comparison to a preset threshold, with instances exceeding the threshold triggering block rejections and/or retransmissions.

摘要翻译： 公开了一种编码系统，其中接收端包括能够产生除硬信息解码输出之外的符号和/或位软信息值之一或两者的解码器。 对于某个信息位位置，计算与接收到的符号和导致估计或检测到的硬信息输出的所有假设的发送码字的集合的联合概率成比例的值。 将具有该特定信息位位置的零的多个码字的计算概率与该特定信息位位置中具有一个的多个码字的计算概率进行比较。 比较结果提供了在该相同信息位位置中的硬信息输出是否更可能是一个或零的指示。 与预设阈值相比，输出软信息值进一步处理，其中实例超过阈值触发块拒绝和/或重传。

公开(公告)号：US5983385A

公开(公告)日：1999-11-09

申请号：US911412

申请日：1997-08-14

申请人： Ali S. Khayrallah ,  Amer A. Hassan

发明人： Ali S. Khayrallah ,  Amer A. Hassan

IPC分类号： H03M13/29 ,  H04L1/00 ,  H03M13/12 ,  H03M13/22

CPC分类号： H04L1/0059 ,  H03M13/2903 ,  H03M13/2939 ,  H03M13/2948 ,  H03M13/3983 ,  H03M13/6561 ,  H04L1/0051 ,  H04L1/0054 ,  H04L1/0066 ,  H04L1/0071

摘要： A source sequence of information symbols is encoded according to each of a plurality of codes to produce a plurality of encoded sequences of symbols, a respective one of the plurality of codes producing a respective one of the plurality of encoded sequences of symbols from the source sequence of information symbols. The plurality of encoded sequences of symbols are combined to produce a sequence of communications symbols. The sequence of communications symbols is processed to produce a communications signal which is then communicated over a communications medium. The communicated communications signal is processed to produce an estimate of the source sequence of information symbols. The source sequence is preferably encoded according to a first error correction code to produce a first encoded sequence of symbols, and encoded according to a second error correction code to produce a second encoded sequence of symbols. The first and second encoded sequences of symbols preferably are multiplexed to produce the sequence of communications symbols. The first error correction code preferably comprises a random error correction code such as a binary convolutional code, while the second error correction code preferably comprises a burst error correction code, for example, a nonbinary convolutional code such as a dual-k convolutional code, thereby providing random and burst error correction capability.

摘要翻译： 信息符号的源序列根据多个代码中的每一个被编码以产生多个编码符号序列，所述多个代码中的相应一个代码从源序列产生多个编码符号序列中的相应一个 的信息符号。 多个编码的符号序列被组合以产生通信符号序列。 处理通信符号的序列以产生通信信号，然后通信信号通过通信介质进行通信。 所传送的通信信号被处理以产生信息符号的源序列的估计。 源序列优选地根据第一纠错码被编码以产生第一编码符号序列，并且根据第二纠错码被编码以产生第二编码符号序列。 第一和第二编码符号序列优选被多路复用以产生通信符号序列。 第一纠错码优选地包括诸如二进制卷积码的随机纠错码，而第二纠错码优选地包括脉冲串纠错码，例如诸如双k卷积码的非二进卷积码，由此 提供随机和突发纠错能力。

公开(公告)号：US5809043A

公开(公告)日：1998-09-15

申请号：US727736

申请日：1996-10-08

申请人： Amer A. Hassan ,  Ali S. Khayrallah ,  Harro Osthoff

发明人： Amer A. Hassan ,  Ali S. Khayrallah ,  Harro Osthoff

IPC分类号： H03M13/37 ,  H03M7/00 ,  H03M13/00 ,  H03M13/05 ,  H03M13/39 ,  H03M13/45 ,  H04L27/00

CPC分类号： H03M13/3944 ,  H03M13/05 ,  H03M13/3707 ,  H03M13/3723 ,  H03M13/6325

摘要： A decoding system processes a received vector r to produce a soft symbol information vector output s including a reliability value for each received code symbol. From the reliability values, clusters of symbols within the received vector r having low reliability are identified and detected. Responsive thereto, the received vector r is permuted to scatter the low reliability symbols within each detected low reliability cluster throughout a given codeword. A decoding generator matrix G is also correspondingly permuted is response to the detection of low reliability clusters of symbols. Utilizing a trellis obtained from the permuted decoding generator matrix G', the permuted received vector r' is then sequentially or otherwise suboptimally decoded.

摘要翻译： 解码系统处理接收的矢量r以产生包括每个接收的码元的可靠性值的软符号信息矢量输出s。 从可靠性值中，识别并检测具有低可靠性的接收矢量r内的符号簇。 响应于此，接收的向量r被置换以在每个检测到的低可靠性集群内的整个给定码字中散布低可靠性符号。 解码产生器矩阵G也被相应地置换为对低可靠性符号簇的检测的响应。 利用从置换的解码产生器矩阵G'获得的网格，然后顺序地或以其它方式被次优解码的置换的接收向量r'。

公开(公告)号：US20130237212A1

公开(公告)日：2013-09-12

申请号：US13414932

申请日：2012-03-08

申请人： Ali S. Khayrallah ,  Yi-Pin Eric Wang

发明人： Ali S. Khayrallah ,  Yi-Pin Eric Wang

IPC分类号： H04W72/04 ,  H04W24/00

CPC分类号： H04B7/0626 ,  H04B7/022 ,  H04B7/0434 ,  H04B7/0452 ,  H04B7/0663 ,  H04B17/373 ,  H04L1/0019 ,  H04L25/03898 ,  H04L25/03949

摘要： A system and method in which a base station treats the Channel State Information (CSI) from wireless terminals as only partially-stale, and exploits this partially-stale CSI to predict the current channel from old estimates of the channel. The predicted channel is then used to design a precoder. The base station shapes the transmitted signal with the precoder so as to match it as closely as possible to the current channel. Particular embodiments thus combine the benefits of the stale feedback scheme with precoding to match the channel. Consequently, the signal received at a terminal is better conditioned, thereby providing a greater overall boost in performance of the communication arrangement between the base station and the terminal. The usage of partially-stale CSI can be important for dense networks with a large number of simple terminals.

摘要翻译： 一种基站将无线终端的信道状态信息（CSI）仅处于部分状态的系统和方法，并利用该部分陈旧的CSI来预测来自信道的旧估计的当前信道。 然后预测的通道用于设计预编码器。 基站用预编码器对发射信号进行整形，使其尽可能接近当前信道。 因此，特定的实施例将陈旧反馈方案的优点与预编码相结合以匹配信道。 因此，在终端处接收的信号被更好地调节，从而对基站和终端之间的通信装置的性能提供更大的整体提升。 部分陈旧的CSI的使用对于具有大量简单终端的密集网络来说可能是重要的。

公开(公告)号：US08279981B2

公开(公告)日：2012-10-02

申请号：US12604570

申请日：2009-10-23

申请人： Ali S. Khayrallah

发明人： Ali S. Khayrallah

IPC分类号： H04L27/06

CPC分类号： H04L25/03305 ,  H04L25/03184 ,  H04L25/03331 ,  H04L2025/03426

摘要： A two-stage approach to MIMO detection improves receiver performance in a computationally tractable manner. A whitening joint detector processes a MIMO symbol stream. The whitening joint detector includes a pre-filter operative to suppress a first subset of the received MIMO streams as colored noise. The whitening joint detector further includes a primary joint detector operative to process a second subset of the MIMO streams and to output a preliminary solution obtained by minimizing a whitening joint detection metric. A secondary detector then operates in the vicinity of the primary joint detector preliminary solution. The secondary detector improves the preliminary solution by comparison to a full joint detection metric.

摘要翻译： MIMO检测的两阶段方法以计算容易的方式改善了接收机的性能。 美白联合检测器处理MIMO符号流。 美白联合检测器包括一个预滤波器，用于将接收的MIMO流的第一子集抑制为有色噪声。 美白联合检测器还包括主接头检测器，其操作以处理MIMO流的第二子集，并输出通过使美白关节检测度量最小化获得的初步解。 次级检测器然后在主接头检测器初步解决方案附近操作。 二次检测器通过与全关节检测度量相比较来改善初步解决方案。

公开(公告)号：US08229040B2

公开(公告)日：2012-07-24

申请号：US12342470

申请日：2008-12-23

申请人： Ali S. Khayrallah

发明人： Ali S. Khayrallah

IPC分类号： H04L27/06

CPC分类号： H04L25/03286 ,  H04L1/0048 ,  H04L1/005 ,  H04L25/03318

摘要： A feedforward receiver and method are described herein that address inter-symbol interference in received symbols by using an enhanced equalizer to generate joint soft values (joint information of a previous modem bit x′ and a modem bit x) and an enhanced decoder which uses the joint soft values and side information (bias about the previous modem bit x′) to output a more reliable information bit x.

摘要翻译： 本文描述了一种前馈接收器和方法，其通过使用增强均衡器来产生联合软值（先前的调制解调器位x'和调制解调器位x的联合信息）以及增强解码器来解决接收到的符号中的符号间干扰， 联合软值和侧信息（关于先前的调制解调器位x'的偏置）以输出更可靠的信息位x。

公开(公告)号：US20120177147A1

公开(公告)日：2012-07-12

申请号：US12987841

申请日：2011-01-10

申请人： Chester Park ,  Lars Sundström ,  Ali S. Khayrallah

发明人： Chester Park ,  Lars Sundström ,  Ali S. Khayrallah

IPC分类号： H04L27/00

CPC分类号： H04B1/0082 ,  H04L5/001 ,  H04L27/2647

摘要： Methods may be provided to simultaneously receive first and second RF (radio frequency) carriers over respective first and second RF carrier frequencies. More particularly, the first and second RF carriers may be provided at an RF mixer stage. During a first time period, the first and second RF carriers may be down converted through the RF mixer stage using a first RF mixer frequency to generate first downconverted signals, and the first downconverted signals may be processed to provide first and second DC carriers corresponding to the first and second RF earners. During a second time period, the first and second RF carriers may be downconverted through the RF mixer stage using a second RF mixer frequency to generate second downconverted signals with the first and second RF mixer frequencies being different, and the second downconverted signals may be processed to provide the first and second DC carriers corresponding to the first and second RF carriers. Related devices are also discussed.

摘要翻译： 可以提供方法以在相应的第一和第二RF载波频率上同时接收第一和第二RF（射频）载波。 更具体地，第一和第二RF载波可以设置在RF混频器级。 在第一时间段期间，第一和第二RF载波可以使用第一RF混频器频率通过RF混频器级下变频以产生第一下变频信号，并且可以处理第一下变频信号以提供对应于 第一和第二RF载波。 在第二时间段期间，第一和第二RF载波可以通过RF混频器级使用第二RF混频器频率进行下变频，以产生具有第一和第二RF混频器频率不同的第二下变频信号，并且可以处理第二下变频信号 以提供对应于第一和第二RF载波的第一和第二DC载波。 还讨论了相关设备。

公开(公告)号：US20120027139A1

公开(公告)日：2012-02-02

申请号：US12847068

申请日：2010-07-30

申请人： Ali S. Khayrallah ,  Stephen Grant

发明人： Ali S. Khayrallah ,  Stephen Grant

IPC分类号： H04B7/10

CPC分类号： H04L25/03305 ,  H04L5/0023 ,  H04L27/38

摘要： The teachings herein provide a method and apparatus for partitioning sets of MIMO streams, for joint processing. In particular, there is an optimum or otherwise best partitioning of a set of MIMO streams into a first subset to be jointly processed and a second subset to be suppressed as interference with respect to that joint processing. Of course, more than one partitioning may be used, e.g., across different joint processing stages and/or at different times, such that all streams of interest are processed. Correspondingly, the present invention provides a method and apparatus for selecting an optimum or otherwise relative “best” subset of MIMO streams for processing together in a joint process, from among a larger set of MIMO streams. The method and apparatus may, for example, be employed in a multi-stage joint processing receiver, where subset selections are performed on a per-stage basis.

摘要翻译： 这里的教导提供了用于分割MIMO流集合的方法和装置，用于联合处理。 特别地，存在一组MIMO流的最佳或另外最佳分割成待共同处理的第一子集，以及被抑制为相对于该联合处理的干扰的第二子集。 当然，可以使用多于一个的划分，例如跨越不同的联合处理阶段和/或在不同的时间，使得处理所有感兴趣的流。 相应地，本发明提供了一种用于从更大的MIMO流集合中选择用于在联合进程中一起处理的MIMO流的最佳或其他相对“最佳”子集的方法和装置。 该方法和装置可以例如在多级联合处理接收机中采用，其中子集选择是在每个阶段进行的。

公开(公告)号：US20110255638A1

公开(公告)日：2011-10-20

申请号：US12760839

申请日：2010-04-15

申请人： Ali S. Khayrallah ,  Chester Park ,  Yi-Pin Eric Wang

发明人： Ali S. Khayrallah ,  Chester Park ,  Yi-Pin Eric Wang

IPC分类号： H04L27/00

CPC分类号： H04L27/38 ,  H04L25/0242 ,  H04L25/03229 ,  H04L27/3416 ,  H04L2025/03388 ,  H04L2025/03414

摘要： In a receiver with a multi-stage equalizer, such as an SLI equalizer, cumulative symbol estimates generated in one or more early stages of the equalizer are used as effective pilot symbols to improve channel estimation for later stages.

摘要翻译： 在具有多级均衡器（诸如SLI均衡器）的接收机中，在均衡器的一个或多个早期阶段中生成的累积符号估计值被用作有效的导频符号，以改进稍后阶段的信道估计。

公开(公告)号：US07929593B2

公开(公告)日：2011-04-19

申请号：US12103145

申请日：2008-04-15

申请人： Ali S. Khayrallah ,  Carmela Cozzo ,  Tracy L. Fulghum

发明人： Ali S. Khayrallah ,  Carmela Cozzo ,  Tracy L. Fulghum

IPC分类号： H04L27/30

CPC分类号： H04B1/7105 ,  H04B1/71072 ,  H04B1/712 ,  H04B2201/709727

摘要： Methods and apparatus for processing a composite communication signal comprising two or more received signals of interest are disclosed. An interference-suppressing receiver, which may comprise a G-Rake receiver or a linear chip equalizer, utilizes a square-root covariance matrix in processing received signals, where the square-root covariance matrix represents impairment covariance or data covariance for the composite communication signal. In an exemplary method, a receiver detects symbols, corresponding to a signal of interest, from the composite communication signal, using processing weights calculated from a square-root covariance matrix and a net channel response for the signal of interest. The method further comprises calculating a reconstructed version of the signal of interest from the detected first symbols, generating an updated communication signal by subtracting the reconstructed version of the first signal of interest from the composite communication signal, and updating the square-root covariance matrix to obtain an updated square-root covariance matrix.

摘要翻译： 公开了用于处理包括两个或更多个所关注的信号的复合通信信号的方法和装置。 可以包括G-Rake接收机或线性码片均衡器的干扰抑制接收机在处理接收信号中使用平方根协方差矩阵，其中平方根协方差矩阵表示复合通信信号的损害协方差或数据协方差 。 在一种示例性方法中，接收机使用从平方根协方差矩阵计算的处理权重和感兴趣信号的净信道响应，从复合通信信号中检测与感兴趣信号相对应的符号。 该方法还包括从检测到的第一符号计算感兴趣信号的重构版本，通过从复合通信信号中减去感兴趣的第一信号的重构版本，并将平方根协方差矩阵更新为 获得更新的平方根协方差矩阵。