公开(公告)号：US20070162814A1

公开(公告)日：2007-07-12

申请号：US11417316

申请日：2006-05-03

申请人： Ba-Zhong Shen ,  Tak Lee ,  Kelly Cameron

发明人： Ba-Zhong Shen ,  Tak Lee ,  Kelly Cameron

IPC分类号： H03M13/00

CPC分类号： H03M13/116 ,  H03M13/1185 ,  H03M13/1188 ,  H03M13/618 ,  H03M13/6362

摘要： LDPC (Low Density Parity Check) code size adjustment by shortening and puncturing. A variety of LDPC coded signals may be generated from an initial LDPC code using selected shortening and puncturing. Using LDPC code size adjustment approach, a single communication device whose hardware design is capable of processing the original LDPC code is also capable to process the various other LDPC codes constructed from the original LDPC code after undergoing appropriate shortening and puncturing. This provides significant design simplification and reduction in complexity because the same hardware can be implemented to accommodate the various LDPC codes generated from the original LDPC code. Therefore, a multi-LDPC code capable communication device can be implemented that is capable to process several of the generated LDPC codes. This approach allows for great flexibility in the LDPC code design, in that, the original code rate can be maintained after performing the shortening and puncturing.

摘要翻译： LDPC（低密度奇偶校验）码字大小调整通过缩短和删截。 可以使用选择的缩短和删截从初始LDPC码生成各种LDPC编码信号。 使用LDPC码大小调整方法，硬件设计能够处理原始LDPC码的单个通信设备也能够在进行适当的缩短和删截之后处理由原始LDPC码构成的各种其他LDPC码。 这提供了重要的设计简化和复杂性的降低，因为可以实现相同的硬件以适应从原始LDPC码产生的各种LDPC码。 因此，可以实现能够处理几个所生成的LDPC码的具有多LDPC码的通信装置。 这种方法允许在LDPC码设计中具有极大的灵活性，因为可以在执行缩短和删截之后维持原始码率。

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。

公开(公告)号：US06691278B1

公开(公告)日：2004-02-10

申请号：US09418210

申请日：1999-10-13

申请人： Ara Patapoutian ,  Ba-Zhong Shen ,  Peter McEwen ,  Michael Leis

发明人： Ara Patapoutian ,  Ba-Zhong Shen ,  Peter McEwen ,  Michael Leis

IPC分类号： G06F1100

CPC分类号： H03M13/09 ,  G11B20/1833 ,  G11B2220/2562 ,  H03M13/11 ,  H03M13/15 ,  H03M13/3944 ,  H03M13/41

摘要： A parity check matrix is generated for detecting predefined errors in a coded string of bits. A column of the matrix is generated by selecting values for elements in the column and processing a predefined error with the selected values in order to produce a syndrome. The selected values are assigned to the column of the parity check matrix if an element of the syndrome has a value indicative of the predefined error.

摘要翻译： 生成奇偶校验矩阵以检测编码比特串中的预定义错误。 通过选择列中的元素的值并使用所选值处理预定义的错误来产生矩阵的列，以产生综合征。 如果校正子的元素具有指示预定义错误的值，则将所选择的值分配给奇偶校验矩阵的列。

公开(公告)号：US08555134B2

公开(公告)日：2013-10-08

申请号：US13613328

申请日：2012-09-13

申请人： Ravi Bhaskaran ,  Bruce J. Currivan ,  Thomas J. Kolze ,  Ba-Zhong Shen

发明人： Ravi Bhaskaran ,  Bruce J. Currivan ,  Thomas J. Kolze ,  Ba-Zhong Shen

IPC分类号： G06F11/00

CPC分类号： H04N21/437 ,  H03M13/29 ,  H03M13/2957 ,  H03M13/2966 ,  H03M13/6511 ,  H04L12/2801 ,  H04N7/17309

摘要： A method of transmitting data in a cable modem system includes the steps of encoding the data using forward error correction. The data is then encoded with Turbo encoding. The data is then sent to a modulation scheme. The data is then transmitted over a cable channel. The data is then demodulated. The data is then decoded using a Turbo decoder. An inverse of the forward error correction is then applied to the data.

摘要翻译： 在电缆调制解调器系统中发送数据的方法包括使用前向纠错对数据进行编码的步骤。 然后使用Turbo编码对数据进行编码。 然后将数据发送到调制方案。 然后通过有线信道传输数据。 然后解调数据。 然后使用Turbo解码器对数据进行解码。 然后将前向纠错的逆向应用于数据。

公开(公告)号：US08495448B2

公开(公告)日：2013-07-23

申请号：US13531655

申请日：2012-06-25

申请人： Ba-Zhong Shen ,  Jason A. Trachewsky

发明人： Ba-Zhong Shen ,  Jason A. Trachewsky

IPC分类号： H04L1/18

CPC分类号： H03M13/1102 ,  H03M13/6356 ,  H03M13/6362 ,  H04L1/0068 ,  H04L1/0079 ,  H04L1/08 ,  H04L27/2601

摘要： In a communication device that is operative to perform decoding, a log-likelihood ratio (LLR) circuitry operates to calculate LLRs corresponding to every bit location within a received bit sequence. This received bit sequence may include a header and a data portion (both of which may be included within a frame that also includes a preamble). The header is composed of information bits, a duplicate of those information bits (such as may be generated in accordance with repetition encoding), and redundancy bits. The header includes information corresponding to frame or data including frame length, a code type by which the data are encoded, a code rate by which the data are encoded, and a modulation by which symbols of the data are modulated. Once the header has been decoded, then the data corresponding thereto is decoded by a block decoder circuitry to make estimates of that data.

摘要翻译： 在可操作地执行解码的通信设备中，对数似然比（LLR）电路用于计算对应于接收的比特序列内的每个比特位置的LLR。 该接收的比特序列可以包括头部和数据部分（两者都可以包括在还包括前同步码的帧内）。 报头由信息位组成，这些信息位的副本（例如可以根据重复编码生成）和冗余位。 标题包括对应于帧或数据的信息，包括帧长度，数据被编码的代码类型，数据被编码的编码速率以及数据的符号被调制的调制。 一旦标题已被解码，则与其对应的数据由块解码器电路解码以对该数据进行估计。

公开(公告)号：US08479076B2

公开(公告)日：2013-07-02

申请号：US13592238

申请日：2012-08-22

申请人： Jason A. Trachewsky ,  Ba-Zhong Shen

发明人： Jason A. Trachewsky ,  Ba-Zhong Shen

IPC分类号： G06F11/00

CPC分类号： H03M13/1102 ,  H03M13/6356 ,  H03M13/6362 ,  H04L1/0068 ,  H04L1/0079 ,  H04L1/08 ,  H04L27/2601

摘要： Header encoding for SC and/or OFDM signaling using shortening, puncturing, and/or repetition in accordance with encoding header information within a frame to be transmitted via a communication channel employs different respective puncturing patterns as applied to different portions thereof. For example, a first puncturing pattern is applied to a first portion of the frame, and a second puncturing pattern is applied to a second portion of the frame (the second portion may be a repeated version of the first portion). Shortening (e.g., by padding 0-valued bits thereto) may be made to header information bits before they undergo encoding (e.g., in an LDPC encoder). One or both of the information bits and parity/redundancy bits output from the encoder undergo selective puncturing. Moreover, one or both of the information bits and parity/redundancy bits output from the encoder may be repeated/spread before undergoing selective puncturing to generate a header.

摘要翻译： 根据要通过通信信道发送的帧内的编码头信息，使用缩短，删截和/或重复的SC和/或OFDM信令的报头编码，采用不同的相应的打孔图案，应用于其不同部分。 例如，将第一穿孔图案应用于框架的第一部分，并且将第二穿孔图案应用于框架的第二部分（第二部分可以是第一部分的重复版本）。 在进行编码之前（例如，在LDPC编码器中），可以缩短（例如，通过填充0值比特）到头信息比特。 从编码器输出的信息位和奇偶校验/冗余位中的一个或两个进行选择性穿孔。 此外，可以在进行选择性穿孔之前重复/扩展从编码器输出的信息比特和奇偶校验/冗余比特中的一个或两个以产生报头。

公开(公告)号：US20120266042A1

公开(公告)日：2012-10-18

申请号：US13531655

申请日：2012-06-25

申请人： Ba-Zhong Shen ,  Jason A, Trachewsky

发明人： Ba-Zhong Shen ,  Jason A, Trachewsky

IPC分类号： H03M13/29 ,  G06F11/10

CPC分类号： H03M13/1102 ,  H03M13/6356 ,  H03M13/6362 ,  H04L1/0068 ,  H04L1/0079 ,  H04L1/08 ,  H04L27/2601

摘要： In a communication device that is operative to perform decoding, a log-likelihood ratio (LLR) circuitry operates to calculate LLRs corresponding to every bit location within a received bit sequence. This received bit sequence may include a header and a data portion (both of which may be included within a frame that also includes a preamble). The header is composed of information bits, a duplicate of those information bits (such as may be generated in accordance with repetition encoding), and redundancy bits. The header includes information corresponding to frame or data including frame length, a code type by which the data are encoded, a code rate by which the data are encoded, and a modulation by which symbols of the data are modulated. Once the header has been decoded, then the data corresponding thereto is decoded by a block decoder circuitry to make estimates of that data.

摘要翻译： 在可操作地执行解码的通信设备中，对数似然比（LLR）电路用于计算对应于接收的比特序列内的每个比特位置的LLR。 该接收的比特序列可以包括头部和数据部分（两者都可以包括在还包括前同步码的帧内）。 报头由信息位组成，这些信息位的副本（例如可以根据重复编码生成）和冗余位。 标题包括对应于帧或数据的信息，包括帧长度，数据被编码的代码类型，数据被编码的编码速率以及数据的符号被调制的调制。 一旦标题已被解码，则与其对应的数据由块解码器电路解码以对该数据进行估计。