公开(公告)号：US20070077969A1

公开(公告)日：2007-04-05

申请号：US11525270

申请日：2006-09-22

申请人： Joseph Lauer ,  Joachim Hammerschmidt

发明人： Joseph Lauer ,  Joachim Hammerschmidt

IPC分类号： H04B7/00 ,  H04B1/02 ,  H04M1/00

CPC分类号： H04L1/0054 ,  H04L1/06

摘要： Maximum likelihood detection of signals in a MIMO receiver. A system transformation is obtained by selecting a weighting matrix that when linearly transforming a channel utilized for wireless communication, results in a particular transformed triangular matrix. The weighting matrix is then used to provide a transformed vector for a received signal that allows a search in one constellation. In searching the constellation recursion values are used to calculate the Euclidean distances between set points of the constellation and the location on the constellation corresponding to the received signal for both bit values 0 and 1. Minimum Euclidean distances are determined for bit values 0 and 1 and the difference of the minimum Euclidean distances is used to compute the maximum likelihood value for bits contained in the received signal.

摘要翻译： MIMO接收机中信号的最大似然检测。 通过选择加权矩阵获得系统变换，该加权矩阵当线性变换用于无线通信的信道时，得到特定的变换三角矩阵。 然后，加权矩阵用于为允许在一个星座中进行搜索的接收信号提供变换矢量。 在搜索星座递归值时，用于计算星座的设定点与位值0和1对应的接收信号对应的星座上的位置之间的欧氏距离。对于位值0和1确定最小欧几里得距离， 使用最小欧几里德距离的差来计算接收信号中包含的位的最大似然值。

公开(公告)号：US20060156169A1

公开(公告)日：2006-07-13

申请号：US11264998

申请日：2005-11-02

申请人： Ba-Zhong Shen ,  Christopher Hansen ,  Joseph Lauer ,  Kelly Cameron ,  Tak Lee ,  Hau Tran

发明人： Ba-Zhong Shen ,  Christopher Hansen ,  Joseph Lauer ,  Kelly Cameron ,  Tak Lee ,  Hau Tran

IPC分类号： H03M13/00

CPC分类号： H04L27/2626 ,  H03M13/1148 ,  H03M13/116 ,  H03M13/255 ,  H03M13/6362 ,  H04B7/0617 ,  H04L1/0057 ,  H04L1/0071 ,  H04L5/0023 ,  H04L27/2647 ,  H04L27/34

摘要： LDPC (Low Density Parity Check) coding and interleaving implemented in multiple-input-multiple-output (MIMO) communication systems. Initially, a novel approach is presented by which a wide variety of irregular LDPC codes may be generated using GRS or RS codes. These irregular LDPC codes can provide better overall performance than regular LDPC codes in terms of providing for lower BER (Bit Error Rate) as a function of SNR (Signal to Noise Ratio). A variety of communication device types are also presented that may employ the error correcting coding using a GRS-based irregular LDPC code, along with appropriately selected interleaving, to provide for even better performance. These communication devices may be implemented to in wireless communication systems including those that comply with the recommendation practices and standards being developed by the IEEE 802.11n Task Group (i.e., the Task Group that is working to develop a standard for 802.11 TGn (High Throughput)).

摘要翻译： 在多输入多输出（MIMO）通信系统中实现的LDPC（低密度奇偶校验）编码和交织。 最初，提出了一种新颖的方法，通过该方法可以使用GRS或RS代码生成各种不规则的LDPC码。 在提供作为SNR（信噪比）的函数的较低BER（误码率）方面，这些不规则LDPC码可以提供比常规LDPC码更好的总体性能。 还提出了各种通信设备类型，其可以采用基于GRS的不规则LDPC码的纠错编码以及适当选择的交织，以提供更好的性能。 这些通信设备可以被实现在无线通信系统中，包括符合由IEEE 802.11n任务组（即，正在努力制定802.11Gn（高吞吐量）的标准的任务组）开发的推荐做法和标准的通信系统， ）。

公开(公告)号：US20050213690A1

公开(公告)日：2005-09-29

申请号：US10810307

申请日：2004-03-26

申请人： Joseph Lauer ,  Alan Corry

发明人： Joseph Lauer ,  Alan Corry

IPC分类号： H03M13/39 ,  H03M13/41 ,  H04L25/06 ,  H04L27/06

CPC分类号： H04L25/067 ,  H03M13/3961 ,  H03M13/41 ,  H03M13/6502

摘要： A Viterbi decoding demapping scheme for a wireless communications device processor substantially implemented on a single CMOS integrated circuit is described. By using log and antilog techniques, simplified multiplication and division operations in the branch metric calculation may be performed. A fully integrated receiver circuit with Viterbi decoder with branch metric computation consumes less circuit space and power than conventional solutions.

摘要翻译： 描述了基本上在单个CMOS集成电路上实现的用于无线通信设备处理器的维特比解码解映射方案。 通过使用log和antilog技术，可以执行分支度量计算中的简化乘法和除法运算。 具有分支度量计算的维特比解码器的完全集成的接收机电路消耗比传统解决方案更少的电路空间和功率。

公开(公告)号：US20060156206A1

公开(公告)日：2006-07-13

申请号：US11292135

申请日：2005-12-01

申请人： Ba-Zhong Shen ,  Joseph Lauer ,  Christopher Hansen ,  Kelly Cameron

发明人： Ba-Zhong Shen ,  Joseph Lauer ,  Christopher Hansen ,  Kelly Cameron

IPC分类号： H03M13/00

CPC分类号： H03M13/6362 ,  H03M13/1148 ,  H03M13/1151 ,  H03M13/116 ,  H03M13/1174 ,  H03M13/1177 ,  H03M13/1185 ,  H03M13/1188 ,  H03M13/1515 ,  H03M13/255

摘要： Algebraic method to construct LDPC (Low Density Parity Check) codes with parity check matrix having CSI (Cyclic Shifted Identity) sub-matrices. A novel approach is presented by which identity sub-matrices undergo cyclic shifting, thereby generating CSI sub-matrices that are arranged forming a parity check matrix of an LDPC code. The parity check matrix of the LDPC code may correspond to a regular LDPC code, or the parity check matrix of the LDPC code may undergo further modification to transform it to that of an irregular LDPC code. The parity check matrix of the LDPC code may be partitioned into 2 sub-matrices such that one of these 2 sub-matrices is transformed to be a block dual diagonal matrix; the other of these 2 sub-matrices may be modified using a variety of means, including the density evolution approach, to ensure the desired bit and check degrees of the irregular LDPC code.