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    Short length LDPC (Low Density Parity Check) code and modulation adapted for high speed Ethernet applications
    1.
    发明申请
    Short length LDPC (Low Density Parity Check) code and modulation adapted for high speed Ethernet applications 失效
    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

    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。

    Amplifying magnitude metric of received signals during iterative decoding of LDPC (Low Density Parity Check) code and LDPC coded modulation
    2.
    发明申请
    Amplifying magnitude metric of received signals during iterative decoding of LDPC (Low Density Parity Check) code and LDPC coded modulation 有权
    在LDPC（低密度奇偶校验）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

    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。

    LDPC (low density parity check) coded modulation hybrid decoding
    5.
    发明申请
    LDPC (low density parity check) coded modulation hybrid decoding 有权
    LDPC（低密度奇偶校验）编码调制混合解码

    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。

    Efficient front end memory arrangement to support parallel bit node and check node processing in LDPC (Low Density Parity Check) decoders
    6.
    发明申请
    Efficient front end memory arrangement to support parallel bit node and check node processing in LDPC (Low Density Parity Check) decoders 有权
    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

    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）。

    Multiple input multiple output wireless local area network communications
    7.
    发明申请
    Multiple input multiple output wireless local area network communications 失效
    多输入多输出无线局域网通信

    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。

    Decoding LDPC (low density parity check) code with new operators based on min* operator
    8.
    发明申请
    Decoding LDPC (low density parity check) code with new operators based on min* operator 有权
    基于min *运算符对新算子解码LDPC（低密度奇偶校验）码

    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。