公开(公告)号：US20080005650A1

公开(公告)日：2008-01-03

申请号：US11701156

申请日：2007-02-01

申请人： Ba-Zhong Shen ,  Hau Tran ,  Kelly Cameron

发明人： Ba-Zhong Shen ,  Hau Tran ,  Kelly Cameron

IPC分类号： G06F11/00

CPC分类号： H04L1/005 ,  H03M13/1105 ,  H03M13/255 ,  H04L1/0058

摘要： LDPC (Low Density Parity Check) coded modulation hybrid decoding. A novel approach is presented wherein a combination of bit decoding and symbol level decoding (e.g., hybrid decoding) is performed for LDPC coded signals. Check node updating and symbol node updating are successively and alternatively performed on bit edge messages for a predetermined number of decoding iterations or until a sufficient degree of precision is achieved. The symbol node updating of the bit edge messages involves using symbol metrics corresponding to the symbol being decoded as well as the bit edge messages most recently updated by check node updating. The check node updating of the bit edge messages involves using the bit edge messages most recently updated by symbol node updating. The symbol node updating also involves computing possible soft symbol estimates for the symbol during each decoding iteration.

摘要翻译： LDPC（低密度奇偶校验）编码调制混合解码。 提出了一种新颖的方法，其中对LDPC编码信号执行比特解码和符号级解码（例如混合解码）的组合。 对于预定数量的解码迭代，或直到达到足够的精确度，连续替代地对位边消息执行检查节点更新和符号节点更新。 位边消息的符号节点更新涉及使用与被解码的符号相对应的符号度量以及最近由校验节点更新更新的位边消息。 位边消息的校验节点更新涉及使用最近通过符号节点更新更新的位边消息。 符号节点更新还涉及在每次解码迭代期间计算符号的可能的软符号估计。

公开(公告)号：US20060041821A1

公开(公告)日：2006-02-23

申请号：US11190657

申请日：2005-07-27

申请人： Ba-Zhong Shen ,  Kelly Cameron ,  Hau Tran ,  Scott Powell

发明人： Ba-Zhong Shen ,  Kelly Cameron ,  Hau Tran ,  Scott Powell

IPC分类号： H03M13/00

CPC分类号： H04L27/04 ,  H03M13/118 ,  H03M13/255 ,  H04L25/4917 ,  H04L27/3416

摘要： A short length LDPC (Low Density Parity Check) code and modulation adapted for high speed Ethernet applications. In some instances, the short length-LDPC code and modulation may be employed within the recommended practices currently being developed by the IEEE 802.3an (10GBASE-T) Task Force. The IEEE 802.3an (10GBASE-T) Task Force has been commissioned to develop and standardize communications protocol adapted particularly for Ethernet operation over 4 wire twisted pair cables. A new LDPC code, some possible embodiments of constellations and the corresponding mappings, as well as possible embodiments of various parity check matrices, H, of the LDPC code are presented herein to provide for better overall performance than other proposed LDPC codes existent in the art of high speed Ethernet applications. Moreover, this proposed LDPC code may be decoded using a communication device having much less complexity than required to decode other proposed LDPC codes existent in this technology space.

摘要翻译： 适用于高速以太网应用的短长度LDPC（低密度奇偶校验）码和调制。 在一些情况下，可以在IEEE 802.3an（10GBASE-T）工作组当前正在开发的推荐做法中采用短长度LDPC码和调制。 IEEE 802.3an（10GBASE-T）工作组已委托开发和标准化通信协议，特别适用于通过4线双绞线电缆进行以太网操作。 本文中呈现了新的LDPC码，星座的一些可能的实施例和对应的映射以及LDPC码的各种奇偶校验矩阵H的可能实施例，以提供比本领域中存在的其它提出的LDPC码更好的总体性能 的高速以太网应用。 此外，该提出的LDPC码可以使用比在该技术空间中存在的其它提出的LDPC码要求更低的复杂度的通信设备进行解码。

公开(公告)号：US20050262421A1

公开(公告)日：2005-11-24

申请号：US11171727

申请日：2005-06-30

申请人： Hau Tran ,  Kelly Cameron ,  Ba-Zhong Shen

发明人： Hau Tran ,  Kelly Cameron ,  Ba-Zhong Shen

IPC分类号： H03M13/00 ,  H03M13/11

CPC分类号： H03M13/6563 ,  H03M13/1137 ,  H03M13/1165

摘要： Efficient front end memory arrangement to support parallel bit node and check node processing in LDPC (Low Density Parity Check) decoders. A novel approach is presented by which the front end design of device capable to decode LDPC coded signals facilitates parallel decoding processing of the LDPC coded signal. The implementation of the front end memory management in conjunction with the implementation of a metric generator operate cooperatively lend themselves for very efficient parallel decoding processing of LDPC coded signals. There are several embodiments by which the front end memory management and the metric generator may be implemented to facilitate this parallel decoding processing of LDPC coded signals. This also allows for the decoding of variable code rate and/or variable modulation signals whose code rate and/or modulation varies as frequently as on a block by block basis (e.g., a block may include a group of symbols within a frame).

摘要翻译： 有效的前端存储器布置支持LDPC（低密度奇偶校验）解码器中的并行比特节点和校验节点处理。 提出了一种能够对LDPC编码信号进行解码的装置的前端设计有助于LDPC编码信号的并行解码处理的新颖方法。 结合执行度量发生器的前端存储器管理的实现协同地借助于LDPC编码信号的非常有效的并行解码处理。 存在可以实现前端存储器管理和度量生成器以促进LDPC编码信号的这种并行解码处理的几个实施例。 这也允许解码可变码率和/或可变调制信号，其码率和/或调制随着逐个块的频率而变化（例如，一个块可以包括帧内的符号组）。

公开(公告)号：US20050186958A1

公开(公告)日：2005-08-25

申请号：US10933586

申请日：2004-09-03

申请人： Christopher Hansen ,  Jason Trachewsky ,  Nambirajan Seshadri ,  Kelly Cameron ,  Hau Tran ,  Ba-Zhong Shen

发明人： Christopher Hansen ,  Jason Trachewsky ,  Nambirajan Seshadri ,  Kelly Cameron ,  Hau Tran ,  Ba-Zhong Shen

IPC分类号： H04L1/06 ,  H04Q7/20

CPC分类号： H04L1/0625 ,  H04L1/0059 ,  H04L1/0071

摘要： A wireless local area network (WLAN) transmitter includes a MAC module, a PLCP module, and a PMD module. The Medium Access Control (MAC) module is operably coupled to convert a MAC Service Data Unit (MSDU) into a MAC Protocol Data Unit (MPDU) in accordance with a WLAN protocol. The Physical Layer Convergence Procedure (PLCP) Module is operably coupled to convert the MPDU into a PLCP Protocol Data Unit (PPDU) in accordance with the WLAN protocol. The Physical Medium Dependent (PMD) module is operably coupled to convert the PPDU into a plurality of radio frequency (RF) signals in accordance with one of a plurality of operating modes of the WLAN protocol, wherein the plurality of operating modes includes multiple input and multiple output combinations.

摘要翻译： 无线局域网（WLAN）发送机包括MAC模块，PLCP模块和PMD模块。 媒体访问控制（MAC）模块可操作地耦合以根据WLAN协议将MAC服务数据单元（MSDU）转换成MAC协议数据单元（MPDU）。 物理层会聚过程（PLCP）模块可操作地耦合，以根据WLAN协议将MPDU转换成PLCP协议数据单元（PPDU）。 物理媒体相关（PMD）模块可操作地耦合以根据WLAN协议的多种操作模式之一将PPDU转换成多个射频（RF）信号，其中多个操作模式包括多个输入和 多个输出组合。

公开(公告)号：US20050149844A1

公开(公告)日：2005-07-07

申请号：US11017403

申请日：2004-12-20

申请人： Hau Tran ,  Ba-Zhong Shen ,  Kelly Cameron

发明人： Hau Tran ,  Ba-Zhong Shen ,  Kelly Cameron

IPC分类号： H03M13/11 ,  H03M13/25 ,  H04L1/00 ,  H04B1/66 ,  G06F11/00 ,  H03M13/00 ,  H04N7/12 ,  H04N11/02 ,  H04N11/04

CPC分类号： H04L1/005 ,  H03M13/1117 ,  H03M13/112 ,  H03M13/1165 ,  H03M13/251 ,  H03M13/255 ,  H03M13/6502 ,  H03M13/658 ,  H04L1/0058

摘要： Decoding LDPC (Low Density Parity Check) code with new operators based on min* operator. New approximate operators are provided that may be employed to assist in calculating one or a minimum value (or a maximum value) when decoding various coded signals. In the context of LDPC decoding that involves both bit node processing and check node processing, either of these new operators (i.e., the min† (min-dagger) operator or the min′ (min-prime) operator) may be employed to perform the check node processing that involves updating the edge messages with respect to the check nodes. Either of these new operators, min† operator or min′ operator, is shown herein to be a better approximate operator to the min** operator.

摘要翻译： 基于min *运算符对新的运算符解码LDPC（低密度奇偶校验）码。 提供了新的近似运算符，其可用于在解码各种编码信号时协助计算一个或最小值（或最大值）。 在涉及位节点处理和校验节点处理的LDPC解码的上下文中，可以使用这些新的运算符（即，最小†（最小匕首）运算符或最小'（最小素数）运算符）中的任一个来执行 检查节点处理涉及相对于校验节点更新边缘消息。 这些新操作符中的任一个，min†操作符或min'操作符在本文中显示为对最小**操作符的更好的近似操作符。

公开(公告)号：US20050149843A1

公开(公告)日：2005-07-07

申请号：US11017087

申请日：2004-12-20

申请人： Ba-Zhong Shen ,  Hau Tran ,  Kelly Cameron

发明人： Ba-Zhong Shen ,  Hau Tran ,  Kelly Cameron

IPC分类号： H03M13/11 ,  H03M13/25 ,  H03M13/29 ,  H03M13/41 ,  H03M13/45 ,  H04L1/00 ,  H04L27/18 ,  H03D1/00 ,  G06F11/00 ,  H03M13/00 ,  H04L27/06

CPC分类号： H04L1/005 ,  H03M5/20 ,  H03M13/1102 ,  H03M13/1105 ,  H03M13/1111 ,  H03M13/1148 ,  H03M13/1177 ,  H03M13/255 ,  H03M13/256 ,  H03M13/258 ,  H03M13/2957 ,  H03M13/4161 ,  H03M13/45 ,  H03M13/6561 ,  H04L1/0041 ,  H04L1/0058 ,  H04L1/006 ,  H04L1/0071 ,  H04L27/18 ,  H04L27/183 ,  H04L27/186 ,  H04L27/2053

摘要： Bandwidth efficient coded modulation scheme based on MLC (Multi-Level Code) signals having multiple maps. The use of multiple maps is adapted to various types of coded signals including multi-level LDPC coded modulation signals and other MLC signals to provide for a significant performance gain in the continual effort trying to reach towards Shannon's limit. In the instance of LDPC coded signals, various level LDPC codewords are generated from individual corresponding LDPC encoders. These various level LDPC codewords are arranged into a number of sub-blocks. Encoded bits from multiple level LDPC codewords within each of the sub-blocks are arranged to form symbols that are mapped according to at least two modulations. Each modulation includes a constellation shape and a corresponding mapping. This use of multiple mappings provides for improved performance when compared to encoders that employ only a single mapping.

摘要翻译： 基于具有多个映射的MLC（多级代码）信号的带宽高效编码调制方案。 多个地图的使用适用于各种类型的编码信​​号，包括多级LDPC编码调制信号和其他MLC信号，以便在试图达到香农限制的持续努力中提供显着的性能增益。 在LDPC编码信号的情况下，从各自对应的LDPC编码器生成各种级别的LDPC码字。 这些各种级别的LDPC码字被排列成多个子块。 每个子块内的多级LDPC码字的编码比特被排列成根据至少两个调制映射的符号。 每个调制包括星座形状和相应的映射。 与仅使用单个映射的编码器相比，使用多个映射提供了改进的性能。

公开(公告)号：US20060224934A1

公开(公告)日：2006-10-05

申请号：US11292133

申请日：2005-12-01

申请人： Kelly Cameron ,  Ba-Zhong Shen ,  Hau Tran

发明人： Kelly Cameron ,  Ba-Zhong Shen ,  Hau Tran

IPC分类号： H03M13/03

CPC分类号： H03M13/253 ,  H03M13/1102 ,  H03M13/1515 ,  H03M13/2966

摘要： System correcting random and/or burst errors using RS (Reed-Solomon) code, turbo/LDPC (Low Density Parity Check) code and convolutional interleave. A novel approach is presented that combines different coding types within a communication system to perform various types of error correction. This combination of accommodating different coding types may be employed at either end of a communication channel (e.g., at a transmitter end when performing encoding and/or at a receiver end when performing decoding). By combining different coding types within a communication system, the error correcting capabilities of the overall system is significantly improved. The appropriate combination of turbo code and/or LDPC code along with RS code allows for error correction or various error types including random error and burst error (or impulse noise).

公开(公告)号：US20060107179A1

公开(公告)日：2006-05-18

申请号：US11190334

申请日：2005-07-27

申请人： Ba-Zhong Shen ,  Kelly Cameron ,  Scott Powell ,  Hau Tran

发明人： Ba-Zhong Shen ,  Kelly Cameron ,  Scott Powell ,  Hau Tran

IPC分类号： H03M13/00

CPC分类号： H03M13/658 ,  H03M13/1111

摘要： Amplifying magnitude metric of received signals during iterative decoding of LDPC code and LDPC coded modulation. By appropriately selecting a metric coefficient value that is used to calculate the initial conditions when decoding LDPC coded signals, a significant reduction in BER may be achieved at certain SNRs. The appropriate selection of the metric coefficient value may be performed depending on the particular SNR at which a communication system is operating. By adjusting this metric coefficient value according to the given LDPC code, modulation, and noise variance, the overall performance of the decoding may be significantly improved. The convergence speed is slowed down so that the decoder will not go to the wrong codeword, and the moving range of the outputs of the decoder is restricted so that the output will not oscillate too much and will eventually move to the correct codeword.

摘要翻译： 在LDPC码和LDPC编码调制的迭代解码期间放大接收信号的幅度度量。 通过在解码LDPC编码信号时适当地选择用于计算初始条件的度量系数值，可以在某些SNR下实现BER的显着降低。 可以根据通信系统正在操作的特定SNR来执行度量系数值的适当选择。 通过根据给定的LDPC码，调制和噪声方差调整该度量系数值，可以显着提高解码的整体性能。 收敛速度变慢，因此解码器不会进入错误的码字，解码器的输出的移动范围受到限制，使得输出不会振荡太多，最终会移动到正确的码字。

公开(公告)号：US20050185575A1

公开(公告)日：2005-08-25

申请号：US10979368

申请日：2004-11-01

申请人： Christopher Hansen ,  Jason Trachewsky ,  Nambirajan Seshadri ,  Kelly Cameron ,  Hau Tran ,  Ba-Zhong Shen

发明人： Christopher Hansen ,  Jason Trachewsky ,  Nambirajan Seshadri ,  Kelly Cameron ,  Hau Tran ,  Ba-Zhong Shen

IPC分类号： H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04B7/216 ,  H04J11/00 ,  H04M1/00

CPC分类号： H04B7/0613 ,  H04B7/0413

摘要： A method for asymmetrical MIMO wireless communication begins by determining a number of transmission antennas for the asymmetrical MIMO wireless communication. The method continues by determining a number of reception antennas for the asymmetrical MIMO wireless communication. The method continues by, when the number of transmission antennas exceeds the number of reception antennas, using spatial time block coding for the asymmetrical MIMO wireless communication. The method continues by, when the number of transmission antennas does not exceed the number of reception antennas, using spatial multiplexing for the asymmetrical MIMO wireless communication.

摘要翻译： 一种用于非对称MIMO无线通信的方法是通过确定用于非对称MIMO无线通信的多个发送天线来开始的。 该方法通过确定用于非对称MIMO无线通信的接收天线的数量来继续。 当发送天线的数量超过接收天线的数量时，该方法继续使用用于非对称MIMO无线通信的空间时间块编码。 当发送天线的数量不超过接收天线的数量时，该方法继续使用用于非对称MIMO无线通信的空间复用。

公开(公告)号：US20050166132A1

公开(公告)日：2005-07-28

申请号：US11017157

申请日：2004-12-20

申请人： Ba-Zhong Shen ,  Hau Tran ,  Kelly Cameron

发明人： Ba-Zhong Shen ,  Hau Tran ,  Kelly Cameron

IPC分类号： H03M13/11 ,  H03M13/25 ,  H03M13/29 ,  H04L1/00 ,  H04L27/18 ,  H03M13/00 ,  G06F11/00

CPC分类号： H04L1/005 ,  H03M13/1105 ,  H03M13/1111 ,  H03M13/1117 ,  H03M13/112 ,  H03M13/1148 ,  H03M13/255 ,  H03M13/258 ,  H03M13/2957 ,  H03M13/6325 ,  H03M13/658 ,  H04L1/0058 ,  H04L1/0071 ,  H04L27/18

摘要： IPHD (Iterative Parallel Hybrid Decoding) of various MLC (Multi-Level Code) signals. Various embodiments are provided by which IPHD may be performed on MLC LDPC (Multi-Level Code Low Density Parity Check) coded modulation signals mapped using a plurality of mappings. This IPHD may also be performed on MLC LDPC coded modulation signals mapped using only a singe mapping as well. In addition, various embodiments are provided by which IPHD may be performed on ML TC (Multi-Level Turbo Code) signals. These principles of IPHD, shown with respect to various embodiments IPHD of MLC LDPC coded modulation signals as well as the IPHD of ML TC signals, may be extended to performing IPHD of other signal types as well. Generally speaking, based on the degree of the MLC signal, a corresponding number of parallel paths operate in cooperation to decode the various levels of the MLC signal.

摘要翻译： 各种MLC（多级码）信号的IPHD（迭代并行混合解码）。 提供了各种实施例，通过该实施例可以对使用多个映射映射的MLC LDPC（多级码低密度奇偶校验）编码的调制信号执行IPHD。 也可以对仅使用单个映射映射的MLC LDPC编码调制信号执行该IPHD。 此外，提供了可以在ML TC（多级Turbo码）信号上执行IPHD的各种实施例。 关于各种实施方案所示的IPHD的这些原理，MLC LDPC编码调制信号以及ML TC信号的IPHD也可以扩展到执行其他信号类型的IPHD。 一般而言，基于MLC信号的程度，相应数量的并行路径协同工作来解码MLC信号的各种级别。