公开(公告)号：US08473817B2

公开(公告)日：2013-06-25

申请号：US12632552

申请日：2009-12-07

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

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

IPC分类号： H03M13/35

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.

公开(公告)号：US08370731B2

公开(公告)日：2013-02-05

申请号：US13423381

申请日：2012-03-19

申请人： Ba-Zhong Shen ,  Hau Thien Tran ,  Tak K. Lee ,  Kelly Brian Cameron

发明人： Ba-Zhong Shen ,  Hau Thien Tran ,  Tak K. Lee ,  Kelly Brian Cameron

IPC分类号： G06F11/10

CPC分类号： H03M13/1174 ,  H03M13/1151 ,  H03M13/1185 ,  H03M13/1188 ,  H03M13/1515 ,  H04L1/0068

摘要： LDPC (Low Density Parity Check) codes with corresponding parity check matrices selectively constructed with CSI (Cyclic Shifted Identity) and null sub-matrices. An LDPC matrix corresponding to an LDPC code is employed within a communication device to encode and/or decode coded signals for use in any of a number of communication systems. The LDPC matrix is composed of a number of sub-matrices and may be partitioned into a left hand side matrix and a right hand side matrix. The right hand side matrix may include two sub-matrix diagonals therein that are composed entirely of CSI (Cyclic Shifted Identity) sub-matrices; one of these two sub-matrix diagonals is located on the center sub-matrix diagonal and the other is located just to the left thereof. All other sub-matrices of the right hand side matrix may be null sub-matrices (i.e., all elements therein are values of zero “0”).

摘要翻译： 具有用CSI（循环移位身份）和空子矩阵选择性构造的相应奇偶校验矩阵的LDPC（低密度奇偶校验）码。 在通信设备内采用对应于LDPC码的LDPC矩阵来编码和/或解码用于多个通信系统中的任何一个的编码信号。 LDPC矩阵由多个子矩阵组成，并且可以被划分为左手侧矩阵和右手侧矩阵。 右手侧矩阵可以包括其中完全由CSI（循环移位身份）子矩阵组成的两个子矩阵对角线; 这两个子矩阵对角线之一位于中心子矩阵对角线上，另一个位于其左侧。 右侧方矩阵的所有其他子矩阵可以是空子矩阵（即，其中的所有元素是0的值）。

公开(公告)号：US20100138721A1

公开(公告)日：2010-06-03

申请号：US12651453

申请日：2010-01-01

申请人： Hau Thien Tran ,  Kelly Brian Cameron ,  Ba-Zhong Shen ,  Tak K. Lee

发明人： Hau Thien Tran ,  Kelly Brian Cameron ,  Ba-Zhong Shen ,  Tak K. Lee

IPC分类号： H03M13/29 ,  G06F11/10 ,  H03M13/05

CPC分类号： H03M13/1162 ,  H03M13/1117 ,  H03M13/112 ,  H03M13/1122 ,  H03M13/1125 ,  H03M13/1137 ,  H03M13/114 ,  H03M13/1165 ,  H03M13/1185 ,  H03M13/616 ,  H03M13/6505 ,  H03M13/658 ,  H03M13/6583

摘要： Overlapping sub-matrix based LDPC (Low Density Parity Check) decoder. Novel decoding approach is presented, by which, updated bit edge messages corresponding to a sub-matrix of an LDPC matrix are immediately employed for updating of the check edge messages corresponding to that sub-matrix without requiring storing the bit edge messages; also updated check edge messages corresponding to a sub-matrix of the LDPC matrix are immediately employed for updating of the bit edge messages corresponding to that sub-matrix without requiring storing the check edge messages. Using this approach, twice as many decoding iterations can be performed in a given time period when compared to a system that performs updating of all check edge messages for the entire LDPC matrix, then updating of all bit edge messages for the entire LDPC matrix, and so on. When performing this overlapping approach in conjunction with min-sum processing, significant memory savings can also be achieved.

摘要翻译： 重叠的基于子矩阵的LDPC（低密度奇偶校验）解码器。 提出了新的解码方法，通过该方法，立即采用对应于LDPC矩阵的子矩阵的更新的位边消息来更新与该子矩阵相对应的校验边消息，而不需要存储位边消息; 立即采用对应于LDPC矩阵的子矩阵的更新的校验边消息来更新与该子矩阵相对应的位边消息，而不需要存储校验边消息。 与执行整个LDPC矩阵的所有校验边消息的更新的系统相比，使用这种方法，在给定时间段内可以执行两倍的解码迭代，然后更新整个LDPC矩阵的所有位边消息，以及 所以。 当结合最小和处理执行这种重叠方法时，也可以节省大量的内存。

公开(公告)号：US20090327847A1

公开(公告)日：2009-12-31

申请号：US12533306

申请日：2009-07-31

申请人： Ba-Zhong Shen ,  Hau Thien Tran ,  Tak K. Lee ,  Kelly Brian Cameron

发明人： Ba-Zhong Shen ,  Hau Thien Tran ,  Tak K. Lee ,  Kelly Brian Cameron

IPC分类号： G06F11/10

CPC分类号： H03M13/1174 ,  H03M13/1151 ,  H03M13/1185 ,  H03M13/1188 ,  H03M13/1515 ,  H04L1/0068

摘要： LDPC (Low Density Parity Check) codes with corresponding parity check matrices selectively constructed with CSI (Cyclic Shifted Identity) and null sub-matrices. An LDPC matrix corresponding to an LDPC code is employed within a communication device to encode and/or decode coded signals for use in any of a number of communication systems. The LDPC matrix is composed of a number of sub-matrices and may be partitioned into a left hand side matrix and a right hand side matrix. The right hand side matrix may include two sub-matrix diagonals therein that are composed entirely of CSI (Cyclic Shifted Identity) sub-matrices; one of these two sub-matrix diagonals is located on the center sub-matrix diagonal and the other is located just to the left thereof. All other sub-matrices of the right hand side matrix may be null sub-matrices (i.e., all elements therein are values of zero “0”).

摘要翻译： 具有用CSI（循环移位身份）和空子矩阵选择性构造的相应奇偶校验矩阵的LDPC（低密度奇偶校验）码。 在通信设备内采用对应于LDPC码的LDPC矩阵来编码和/或解码用于多个通信系统中的任何一个的编码信号。 LDPC矩阵由多个子矩阵组成，并且可以被划分为左手侧矩阵和右手侧矩阵。 右手侧矩阵可以包括其中完全由CSI（循环移位身份）子矩阵组成的两个子矩阵对角线; 这两个子矩阵对角线之一位于中心子矩阵对角线上，另一个位于其左侧。 右侧方矩阵的所有其他子矩阵可以是空子矩阵（即，其中的所有元素为零“0”）。

公开(公告)号：US20090193312A1

公开(公告)日：2009-07-30

申请号：US12021911

申请日：2008-01-29

申请人： Tak K. Lee ,  Ba-Zhong Shen ,  Hau Thien Tran ,  Kelly Brian Cameron

发明人： Tak K. Lee ,  Ba-Zhong Shen ,  Hau Thien Tran ,  Kelly Brian Cameron

IPC分类号： H04L1/18

CPC分类号： H04L1/0043 ,  H04L1/0057 ,  H04L1/009

摘要： Fixed-spacing parity insertion for FEC (Forward Error Correction) codewords. Fixed spacing is employed to intersperse parity bits among information bits when generating a codeword. According to this fixed spacing, a same number of information bits is placed between each of the parity bits within the codeword. If desired, the order of the parity bits may be changed before they are placed into the codeword. Moreover, the order of the information bits may also be modified before they are placed into the codeword. The FEC encoding employed to generate the parity bits from the information bits can be any of a variety of codes include Reed-Solomon (RS) code, LDPC (Low Density Parity Check) code, turbo code, turbo trellis coded modulation (TTCM), or some other code providing FEC capabilities.

摘要翻译： 用于FEC（前向纠错）码字的固定间隔奇偶校验插入。 当产生码字时，使用固定间隔来分散信息比特之间的奇偶比特。 根据该固定间隔，在码字中的每个奇偶校验位之间放置相同数量的信息比特。 如果需要，奇偶校验位的顺序可以在它们被置入码字之前改变。 此外，信息比特的顺序也可以在它们被置入码字之前被修改。 用于从信息比特生成奇偶校验位的FEC编码可以是各种代码中的任何一种，包括里德 - 所罗门（RS）码，LDPC（低密度奇偶校验）码，turbo码，turbo格状编码调制（TTCM） 或提供FEC能力的一些其他代码。

公开(公告)号：US08631312B2

公开(公告)日：2014-01-14

申请号：US13753579

申请日：2013-01-30

申请人： Ba-Zhong Shen ,  Hau Thien Tran ,  Tak K. Lee ,  Kelly Brian Cameron

发明人： Ba-Zhong Shen ,  Hau Thien Tran ,  Tak K. Lee ,  Kelly Brian Cameron

IPC分类号： H03M13/00

CPC分类号： H03M13/1174 ,  H03M13/1151 ,  H03M13/1185 ,  H03M13/1188 ,  H03M13/1515 ,  H04L1/0068

摘要： LDPC (Low Density Parity Check) codes with corresponding parity check matrices selectively constructed with CSI (Cyclic Shifted Identity) and null sub-matrices. An LDPC matrix corresponding to an LDPC code is employed within a communication device to encode and/or decode coded signals for use in any of a number of communication systems. The LDPC matrix is composed of a number of sub-matrices and may be partitioned into a left hand side matrix and a right hand side matrix. The right hand side matrix may include two sub-matrix diagonals therein that are composed entirely of CSI (Cyclic Shifted Identity) sub-matrices; one of these two sub-matrix diagonals is located on the center sub-matrix diagonal and the other is located just to the left thereof. All other sub-matrices of the right hand side matrix may be null sub-matrices (i.e., all elements therein are values of zero “0”).

摘要翻译： 具有用CSI（循环移位身份）和空子矩阵选择性构造的相应奇偶校验矩阵的LDPC（低密度奇偶校验）码。 在通信设备内采用对应于LDPC码的LDPC矩阵来编码和/或解码用于多个通信系统中的任何一个的编码信号。 LDPC矩阵由多个子矩阵组成，并且可以被划分为左手侧矩阵和右手侧矩阵。 右手侧矩阵可以包括其中完全由CSI（循环移位身份）子矩阵组成的两个子矩阵对角线; 这两个子矩阵对角线之一位于中心子矩阵对角线上，另一个位于其左侧。 右侧方矩阵的所有其他子矩阵可以是空子矩阵（即，其中的所有元素为零“0”）。

公开(公告)号：US08408475B2

公开(公告)日：2013-04-02

申请号：US13555415

申请日：2012-07-23

申请人： Ba-Zhong Shen ,  Sirikiat Lek Ariyavisitakul ,  Mark Kent ,  Tak K. Lee ,  Kelly Brian Cameron

发明人： Ba-Zhong Shen ,  Sirikiat Lek Ariyavisitakul ,  Mark Kent ,  Tak K. Lee ,  Kelly Brian Cameron

IPC分类号： G08C25/02 ,  H03M13/00 ,  G06F11/10 ,  H04L27/00 ,  H04L27/06

CPC分类号： H04L1/1835 ,  H03M13/09 ,  H03M13/2957 ,  H03M13/6306 ,  H04L1/0066 ,  H04L1/1819

摘要： Flexible rate matching. No constraints or restrictions are placed on a sending communication device when effectuating rate matching. The receiving communication device is able to accommodate received transmissions of essentially any size (e.g., up to an entire turbo codeword that includes all systematic bits and all parity bits). The receiving communication device employs a relatively small-sized memory to ensure a lower cost, smaller sized communication device (e.g., handset or user equipment such as a personal wireless communication device). Moreover, incremental redundancy is achieved in which successive transmissions need not include repeated information therein (e.g., a second transmission need not include any repeated information from a first transmission). Only when reaching an end of a block of bits or codeword to be transmitted, and when wrap around at the end of such block of bits or codeword occurs, would any repeat of bits be incurred within a later transmission.

公开(公告)号：US08407556B2

公开(公告)日：2013-03-26

申请号：US12413552

申请日：2009-03-28

申请人： Ba-Zhong Shen ,  Christopher J. Hansen ,  Joseph Paul Lauer ,  Kelly Brian Cameron ,  Tak K. Lee ,  Hau Thien Tran

发明人： Ba-Zhong Shen ,  Christopher J. Hansen ,  Joseph Paul Lauer ,  Kelly Brian Cameron ,  Tak K. Lee ,  Hau Thien 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. As described herein, a wide variety of irregular LDPC codes may be generated using GRS or RS codes. A variety of communication device types are also presented that may employ the error correcting coding (ECC) using a GRS-based irregular LDPC code, along with appropriately selected interleaving, to provide for communications using ECC. 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。 如本文所述，可以使用GRS或RS代码来生成各种不规则的LDPC码。 还提出了各种通信设备类型，其可以使用基于GRS的不规则LDPC码的纠错编码（ECC）以及适当选择的交织，以提供使用ECC的通信。 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：US07631246B2

公开(公告)日：2009-12-08

申请号：US11417316

申请日：2006-05-03

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

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

IPC分类号： H03M13/35

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：US07617433B2

公开(公告)日：2009-11-10

申请号：US11360268

申请日：2006-02-23

申请人： Tak K. Lee ,  Hau Thien Tran ,  Ba-Zhong Shen ,  Kelly Brian Cameron

发明人： Tak K. Lee ,  Hau Thien Tran ,  Ba-Zhong Shen ,  Kelly Brian Cameron

IPC分类号： H03M13/00

CPC分类号： H03M13/116 ,  H03M13/1137 ,  H03M13/255 ,  H03M13/27 ,  H03M13/6362 ,  H03M13/6566

摘要： Implementation of LDPC (Low Density Parity Check) decoder by sweeping through sub-matrices. A novel approach is presented by which an LDPC coded signal is decoded processing the columns and rows of the individual sub-matrices of the low density parity check matrix corresponding to the LDPC code. The low density parity check matrix can partitioned into rows and columns according to each of the sub-matrices of it, and each of those sub-matrices also includes corresponding rows and columns. For example, when performing bit node processing, the same columns of at 1 or more sub-matrices can be processed together (e.g., all 1st columns in 1 or more sub-matrices, all 2nd columns in 1 or more sub-matrices, etc.). Analogously, when performing check node processing, the same rows of 1 or more sub-matrices can be processed together (e.g., all 1st rows in 1 or more sub-matrices, all 2nd rows in 1 or more sub-matrices, etc.).

摘要翻译： 通过扫描子矩阵实现LDPC（低密度奇偶校验）解码器。 提出了一种解码处理与LDPC码对应的低密度奇偶校验矩阵的各个子矩阵的列和行的LDPC编码信号的新方法。 低密度奇偶校验矩阵可以根据它的每个子矩阵划分成行和列，并且这些子矩阵中的每一个也包括相应的行和列。 例如，当执行位节点处理时，可以一起处理1个或更多个子矩阵的相同列（例如，1个或更多个子矩阵中的所有第1列，1个或更多个子矩阵中的所有第2列等 。）。 类似地，当执行校验节点处理时，可以一起处理1个或更多个子矩阵的相同行（例如，1个或更多个子矩阵中的所有第1行，1个或更多个子矩阵中的所有第2行等） 。