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81.发明申请公开(公告)号：US20120243468A1
公开(公告)日：2012-09-27
申请号：US13070414
申请日：2011-03-23
IPC分类号： H04W4/00
CPC分类号： H04B7/024 , H03M7/3068 , H03M7/3082
摘要： A compression/decompression method for backhaul communication of a complex-valued radio signal between base stations and the network processing unit, such as a Central Processor of a Coordinated MultiPoint (CoMP) system, significantly reduces backhaul bandwidth. The spatial and temporal correlations of the wireless IQ signal are exploited in order to remove redundancy and substantially reduce signal bandwidth. Feature component signals of significance are extracted through linear transformation to form the radio signal, and are individually quantized, possibly at different bit rates in accordance with their relative importance. The transformation can either be pre-determined or computed in real-time based on the spatial and temporal statistics of the radio signal. In the latter case, the transformation matrix or matrices are also sent over the backhaul in order to allow the radio signal to be reconstructed at the receiving end. Different methods of generating the transformation matrices are proposed.
摘要翻译： 用于基站和诸如协调多点（CoMP）系统的中央处理器的网络处理单元之间的复数无线电信号的回程通信的压缩/解压缩方法显着地减少了回程带宽。 利用无线IQ信号的空间和时间相关性来消除冗余并显着降低信号带宽。 通过线性变换提取有意义的特征分量信号以形成无线电信号，并且可以根据其相对重要性以不同的比特率单独量化。 可以基于无线电信号的空间和时间统计来实时地进行转换或者实时地进行转换。 在后一种情况下，转换矩阵或矩阵也通过回程发送，以允许在接收端重建无线电信号。 提出了生成转换矩阵的不同方法。
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公开(公告)号：US08046657B2
公开(公告)日：2011-10-25
申请号：US11451724
申请日：2006-06-13
IPC分类号： H03M13/45
CPC分类号： H03M13/05 , H03M13/11 , H03M13/255
摘要： According to a method and apparatus taught herein, a decoding circuit and method decode linear block codes based on determining joint probabilities for one or more related subsets of bits in received data blocks. The use of joint probabilities enables faster and more reliable determination of received bits, meaning that, for example, joint probability decoding requires fewer decoding iterations than a comparable decoding process based on single-bit probabilities. As a non-limiting example, the decoding circuit and method taught herein provide advantageous operation with Low Density Parity Check (LDPC) codes, and can be incorporated in a variety of communication systems and devices, such as those associated with wireless communication networks.
摘要翻译： 根据本文教导的方法和装置，解码电路和方法基于确定接收数据块中一个或多个相关的比特子集的联合概率来解码线性块码。 联合概率的使用使得能够更快更可靠地确定接收到的比特，这意味着例如，联合概率解码比基于单比特概率的可比较的解码过程需要更少的解码迭代。 作为非限制性示例，本文教导的解码电路和方法提供了具有低密度奇偶校验（LDPC）码的有利操作，并且可以并入各种通信系统和设备中，诸如与无线通信网络相关联的通信系统和设备。
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公开(公告)号：US20110096873A1
公开(公告)日：2011-04-28
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。
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84.发明申请公开(公告)号：US20110051852A1
公开(公告)日：2011-03-03
申请号：US12549157
申请日：2009-08-27
申请人： Ali S. Khayrallah
发明人： Ali S. Khayrallah
CPC分类号： H04B1/1081 , H04J11/0046 , H04L25/03229 , H04L25/0328 , H04L25/03299 , H04L25/03305 , H04L27/3416 , H04L27/38 , H04L2025/03388 , H04L2025/0342 , H04L2025/03426
摘要： A receiver includes a constellation processing module and a multi-stage demodulator having a plurality of non-final demodulation stages and a final demodulation stage. The constellation processing module derives a set of centroid-based values from subsets of constellation points associated with a plurality of transmitted signals for input to each of the non-final demodulation stages. Each of the non-final demodulation stages demodulates a group of signals input to the non-final demodulation stage using the set of centroid-based values as constellation points and suppresses residual interference associated with using the set of centroid-based values as constellation points for signal demodulation. The final demodulation stage demodulates a group of modified signals input to the final demodulation stage using the subset of constellation points input to the final demodulation stage to determine a final symbol decision for the plurality of transmitted signals.
摘要翻译： 接收机包括具有多个非最终解调级和最终解调级的星座处理模块和多级解调器。 星座处理模块从与多个发射信号相关联的星座点的子集中导出一组基于质心的值，以输入到每个非最终解调级。 每个非最终解调级使用基于质心的值作为星座点解调输入到非最终解调级的一组信号，并且抑制与使用基于质心的值的集合相关联的残留干扰作为星座点 信号解调。 最终解调级使用输入到最终解调级的星座点的子集来解调输入到最终解调级的一组修改信号，以确定多个发射信号的最终符号判定。
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公开(公告)号：US20110038402A1
公开(公告)日：2011-02-17
申请号：US12542335
申请日：2009-08-17
申请人： Ali S. Khayrallah
发明人： Ali S. Khayrallah
CPC分类号： H04L25/03171 , H04L25/03184 , H04L25/03203 , H04L25/03286 , H04L25/03318
摘要： As disclosed herein, a “super receiver” structure enriches the information provided for decoding modem bits included in a received sequence of symbols. In particular, an equalizer circuit provides joint metrics to a decoder circuit, where the joint metrics advantageously reflect joint bit probabilities. However, the metrics are computed without need for complex joint probability calculations. The decoder circuit “fuses” the joint metrics with corresponding side information, which indicates the likelihood that one or more bits represented by the joint metric take on a particular value. Such fusing biases the soft value estimation for the other bits represented by the joint metric, thus enabling the decoder to operate on refined soft values in its bit decoding operations.
摘要翻译： 如本文所公开的，“超级接收机”结构丰富了用于解码包含在所接收的符号序列中的调制解调器位的信息。 特别地，均衡器电路向解码器电路提供联合度量，其中联合度量有利地反映了联合位概率。 然而，在不需要复杂联合概率计算的情况下计算度量。 解码器电路将联合度量与相应的侧面信息“融合”，其指示由联合度量表示的一个或多个比特具有特定值的可能性。 这种融合偏置了由联合度量表示的其他位的软值估计，从而使解码器能够在其位解码操作中对精细的软值进行操作。
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公开(公告)号：US07769080B2
公开(公告)日：2010-08-03
申请号：US11470676
申请日：2006-09-07
申请人： Ali S. Khayrallah
发明人： Ali S. Khayrallah
IPC分类号： H04B1/00
CPC分类号： H04B1/712 , H04B2201/709727
摘要： A method and apparatus for updating a square root matrix of a covariance matrix when sample sets are added to or removed from a received signal. When a sample set is added to the received signal, a processor augments the square root matrix to generate an updated square root matrix for future processing. When a sample set is no longer present in the received signal, the processor reduces the square root matrix to generate the updated square root matrix.
摘要翻译： 当将样本集合添加到接收信号或从接收信号中移除时，用于更新协方差矩阵的平方根矩阵的方法和装置。 当样本集合被添加到接收信号时，处理器增加平方根矩阵以生成更新的平方根矩阵用于将来的处理。 当采样集不再存在于接收信号中时，处理器减小平方根矩阵以生成更新后的平方根矩阵。
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87.发明授权System and method for Fast Walsh Transform processing in a multi-coded signal environment 有权用于多编码信号环境中快速沃尔什变换处理的系统和方法公开(公告)号：US07308019B2
公开(公告)日：2007-12-11
申请号：US10151682
申请日：2002-05-20
IPC分类号： H04L27/30
CPC分类号： H04B1/7115 , H04B1/7117 , H04B2001/70935 , H04B2201/70705 , H04B2201/70707 , H04B2201/709727 , H04J13/0048
摘要： A flexible Fast Walsh Transform circuit provides configurable FWT sizes, and is suitable for use in radio receivers where the received signal may be generated using varying spreading codes and/or varying numbers of multi-codes. Such signal types are commonly encountered in wireless communication systems like those based on the Wideband CDMA (W-CDMA) or IS-2000 (cdma2000) standards, and particularly with the higher data rate provisions of those standards. In one application, a RAKE receiver includes RAKE fingers that each include one of the flexible FWT circuits, such that each finger despreads the received signal using variably sized FWTs in accordance with the characteristics of the received signal. The flexibility in FWT sizing may derive from, for example, the inclusion of separately selectable but differently sized FWT circuits, or from the inclusion of a configurable FWT circuit capable of generating different sizes of FWTs.
摘要翻译： 灵活的快速沃尔什变换电路提供可配置的FWT大小，并且适用于无线电接收机，其中接收信号可以使用变化的扩展码和/或不同数量的多码来产生。 在诸如基于宽带CDMA（W-CDMA）或IS-2000（cdma2000）标准的无线通信系统中通常遇到这样的信号类型，特别是在这些标准的较高数据速率规定中。 在一个应用中，RAKE接收机包括RAKE指，其中每个包括柔性FWT电路之一，使得每个指根据接收信号的特性使用可变大小的FWT来解扩接收信号。 FWT尺寸的灵活性可以来自例如包括单独可选择但不同尺寸的FWT电路，或者包括能够产生不同大小的FWT的可配置FWT电路。
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公开(公告)号：US06987975B1
公开(公告)日：2006-01-17
申请号：US09289067
申请日：1999-04-08
申请人： David R. Irvin , Ali S. Khayrallah
发明人： David R. Irvin , Ali S. Khayrallah
IPC分类号： H04Q7/20
摘要： A method of generating a control signal to enable or inhibit a wide variety of applications is provided. The method generally includes the steps of determining the location of a first mobile radio terminal, determining the location of a second mobile radio terminal, comparing the locations of the terminals, and generating a control signal based upon the comparison. The control signal may be generated if the first and second mobile radio terminals are within a specified distance of one another. Alternatively, the control signal may be generated if the first and second mobile radio terminals are separated by at least a specified distance from one another. Additionally, the control signal may be generated if it is determined that the first mobile radio terminal is at a first specified location and the second mobile radio terminal is at a second specified location spacially separated from the first specified location. Further, the control signal may be generated if the first and second mobile radio terminals are at specified locations at a preselect time.
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公开(公告)号：US06813322B2
公开(公告)日：2004-11-02
申请号：US09843558
申请日：2001-04-26
IPC分类号： H03D100
CPC分类号： H03M13/4146 , H03M13/09 , H03M13/3738 , H03M13/3776 , H03M13/612 , H03M13/658 , H04L1/0054
摘要： Biasing soft output values based on a known or learned bit error rate function yields performance improvements in decoding algorithms adapted to work with soft values, such as soft output Viterbi algorithms (SOVA). For example, in a wireless receiver, the soft output values output from a signal demodulator may be biased to reflect the changes in bit error rate across a given burst or block of data. Such changes might arise, for example, due to increasing inaccuracies in the receiver's channel estimate, which is typically computed at the beginning or middle of a block of received data. The wireless receiver may store a table of scaling factors corresponding to the expected bit error rate distribution of the received signal. The table may be preloaded into the receiver, or may be determined during operation. In either case, the table may be updated during operation to reflect bit error incidence observed during operation.
摘要翻译： 基于已知或学习的误码率函数对软输出值进行偏移，可以在适用于软值（例如软输出维特比算法（SOVA））的解码算法中提高性能。 例如，在无线接收机中，从信号解调器输出的软输出值可能被偏置以反映给定突发或数据块的误码率的变化。 这种变化可能会出现，例如，由于接收机的信道估计的不准确性增加，这通常在接收数据块的开始或中间计算。 无线接收机可以存储与接收信号的预期误码率分布相对应的缩放因子表。 该表可以预加载到接收器中，或者可以在操作期间确定。 在任一情况下，在操作期间可以更新表以反映在操作期间观察到的位错误发生。
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公开(公告)号：US06597743B1
公开(公告)日：2003-07-22
申请号：US09454577
申请日：1999-12-07
IPC分类号： H04L2302
CPC分类号： H03M13/3955
摘要： A reduced search symbol estimation algorithm includes a forward recursion, a backward recursion, and a combining step. To reduce complexity, during the forward and backward recursions, the number of survivor states retained at each stage is less than the total number of states of the trellis. The survivor states are selected from a group of candidate states, that are connected by branches to survivors from the previous stage of the recursion. The decoder compares the accumulated path metrics for each candidate state and retains a specified number of states that is less than the total possible number of states. For the forward recursion, the retained states or survivor states, denoted as Qk, are stored along with the corresponding state metrics. For the backward recursion, the retained states, denoted as Rk, are stored along with the corresponding state metrics. During the combining step, the computation of a soft value is restricted to branches (s′,s) connecting survivor states s′ and s in the forward and backward recursions respectively.
摘要翻译： 减少的搜索符号估计算法包括正向递归，反向递归和组合步骤。 为了减少复杂性，在向前和向后递归期间，每个阶段保留的幸存者国家数量小于网格状态总数。 幸存者状态是从一组候选国中选出的，这些候选国通过分支到递归的前一阶段与幸存者相连。 解码器比较每个候选状态的累积路径度量，并保留小于总可能状态数的指定数量的状态。 对于正向递归，保留状态或幸存者状态（表示为Qk）与相应的状态度量一起存储。 对于反向递归，表示为Rk的保留状态与相应的状态度量一起存储。 在组合步骤中，软值的计算分别限制在向前和向后递归中连接幸存者状态s'和s的分支（s'，s）。
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