公开(公告)号：US20080065953A1

公开(公告)日：2008-03-13

申请号：US11938095

申请日：2007-11-09

申请人： Feng-Wen Sun ,  Mustafa Eroz ,  Lin-Nan Lee

发明人： Feng-Wen Sun ,  Mustafa Eroz ,  Lin-Nan Lee

IPC分类号： H03M13/05 ,  G06F11/10

CPC分类号： H03M13/1165 ,  H03M13/1137

摘要： An approach is provided for efficiently decoding low density parity check (LDPC) codes. An LDPC decoder includes a memory for storing a mapped matrix that satisfies a plurality of parallel decodable conditions for permitting a lumped memory structure. Additionally, the decoder includes a parallel processors accessing edge values from the stored mapped matrix decode the LDPC codes. The above approach has particular applicability to satellite broadcast systems.

摘要翻译： 提供了一种用于有效解码低密度奇偶校验（LDPC）码的方法。 LDPC解码器包括存储器，用于存储满足用于允许集中存储器结构的多个并行可解码条件的映射矩阵。 此外，解码器包括从存储的映射矩阵访问边缘值的并行处理器解码LDPC码。 上述方法对卫星广播系统具有特别的适用性。

公开(公告)号：US20070101233A1

公开(公告)日：2007-05-03

申请号：US11432576

申请日：2006-05-11

申请人： Mustafa Eroz ,  Lakshmi Iyer ,  Lin-Nan Lee

发明人： Mustafa Eroz ,  Lakshmi Iyer ,  Lin-Nan Lee

IPC分类号： H03M13/00

CPC分类号： H03M13/116 ,  H03M13/1185 ,  H03M13/1188 ,  H03M13/6356 ,  H03M13/6362

摘要： A method, system, apparatus and computer program product for correcting errors in a signal transmission using a rate 3/4 low density parity check (LDPC) code. At least a portion of a received data message is encoded by using a parity check matrix of the LDPC code. The encoded data message is transmitting in a signal transmission over a communication channel to a receiving device in the communication network. After being received, the encoded portion of the data message is decoded using a parity check matrix of the LDPC code to obtain the data message. For example, the encoding and decoding can be performed using a parity check matrix corresponds to a coded block size (N) equal to 1944 for communicating data in compliance with an 802.11n standard.

摘要翻译： 一种用于使用速率3/4低密度奇偶校验（LDPC）码校正信号传输中的错误的方法，系统，装置和计算机程序产品。 通过使用LDPC码的奇偶校验矩阵来对接收到的数据消息的至少一部分进行编码。 编码数据消息是通过通信信道在信号传输中发送到通信网络中的接收装置。 在接收之后，使用LDPC码的奇偶校验矩阵对数据消息的编码部分进行解码以获得数据消息。 例如，可以使用对应于等于1944的编码块大小（N）的奇偶校验矩阵来进行编码和解码，以根据802.11n标准传送数据。

公开(公告)号：US20060153313A1

公开(公告)日：2006-07-13

申请号：US11009346

申请日：2004-12-10

申请人： Lin-Nan Lee ,  Feng-Wen Sun ,  Adam Ancken

发明人： Lin-Nan Lee ,  Feng-Wen Sun ,  Adam Ancken

IPC分类号： H04B15/00 ,  H03D1/04

CPC分类号： H04N5/211 ,  H04B7/18513 ,  H04H20/51 ,  H04L25/03866

摘要： An approach is provided for minimizing co-channel interference in a communication system is disclosed. A header of a first frame is scrambled based on a first unique word. A header of a second frame is scrambled based on a second unique word. The first frame including the corresponding scrambled header and the second frame including the corresponding scrambled header are transmitted, respectively, over adjacent co-channels of the communication system. Each of the frames further includes a payload and a pilot block. The payload and the pilot block of the first frame are scrambled based on a first scrambling sequence. The payload and the pilot block of the second frame are scrambled based on a second scrambling sequence. The above arrangement is particularly suited to a digital satellite broadcast and interactive system.

摘要翻译： 提供了一种用于最小化通信系统中的同信道干扰的方法。 基于第一唯一字来加扰第一帧的报头。 基于第二唯一字对第二帧的报头进行加扰。 分别在通信系统的相邻共同信道上发送包括对应的加扰报头和包括对应的加扰报头的第二帧的第一帧。 每个帧还包括有效载荷和导频块。 基于第一加扰序列对第一帧的有效载荷和导频块进行加扰。 基于第二加扰序列对第二帧的净荷和导频块进行加扰。 上述布置特别适用于数字卫星广播和交互式系统。

公开(公告)号：US07020829B2

公开(公告)日：2006-03-28

申请号：US10454439

申请日：2003-06-04

申请人： Mustafa Eroz ,  Feng-Wen Sun ,  Lin-Nan Lee

发明人： Mustafa Eroz ,  Feng-Wen Sun ,  Lin-Nan Lee

IPC分类号： H03M13/00 ,  H03M13/03

CPC分类号： H04L1/005 ,  H03M13/1102 ,  H03M13/1111 ,  H03M13/112 ,  H03M13/1137 ,  H03M13/1165 ,  H03M13/15 ,  H03M13/1515 ,  H03M13/152 ,  H03M13/255 ,  H03M13/2906 ,  H03M13/356 ,  H03M13/6362 ,  H03M13/6583 ,  H04H40/90 ,  H04L1/0057 ,  H04L1/006 ,  H04L27/20 ,  H04L27/34 ,  H04L27/36

摘要： An approach is provided for transmitting messages using low density parity check (LDPC) codes. Input messages are encoded according to a structured parity check matrix that imposes restrictions on a sub-matrix of the parity check matrix to generate LDPC codes. The LDPC codes are transmitted over a radio communication system (e.g., satellite network), wherein a receiver communicating over the radio communication system is configured to iteratively decode the received LDPC codes according to a signal constellation associated with the LDPC codes. The receiver is configured to iteratively regenerating signal constellation bit metrics after one or more decoding iterations.

摘要翻译： 提供了一种使用低密度奇偶校验（LDPC）码传输消息的方法。 根据对奇偶校验矩阵的子矩阵施加限制以生成LDPC码的结构化奇偶校验矩阵对输入消息进行编码。 LDPC码通过无线电通信系统（例如，卫星网络）发送，其中通过无线电通信系统通信的接收机被配置为根据与LDPC码相关联的信号星座对所接收的LDPC码进行迭代解码。 接收机被配置为在一个或多个解码迭代之后迭代地再生信号星座位度量。

公开(公告)号：US06940809B2

公开(公告)日：2005-09-06

申请号：US10799868

申请日：2004-03-12

申请人： Feng-Wen Sun ,  Lin-Nan Lee ,  Khalid Karimullah

发明人： Feng-Wen Sun ,  Lin-Nan Lee ,  Khalid Karimullah

IPC分类号： H04L1/18 ,  H04Q7/24 ,  H04J1/16

CPC分类号： H04L1/1812

摘要： A system and method where a data transmitter retransmits data frames to a receiver for combination with previously transmitted data frames that were received with errors to increase gain at the receiver. The data transmitter receives a retransmission request from the receiver and retransmits a particular data frame without a signaling message. The receiver compares the retransmitted data frame to other data frames stored in a buffer to determine the likelihood of a match between the transmitted data frame and a buffered data frame. When the likelihood of a match exceeds at least one predetermined threshold, the receiver combines the retransmitted data frame with the matching data frame. If the likelihood of a match is below any of the predetermined thresholds, the receiver stores either the combined data frame, or the retransmitted and matching data frame, depending on which threshold is not exceeded, and sends another retransmission request.

摘要翻译： 一种系统和方法，其中数据发射机向接收机重发数据帧以与先前发送的数据帧组合，以及接收到错误的数据帧以增加接收机的增益。 数据发射机接收来自接收机的重传请求，并重发特定的数据帧而不发送信令消息。 接收机将重传的数据帧与存储在缓冲器中的其他数据帧进行比较，以确定发送的数据帧与缓冲的数据帧之间的匹配的可能性。 当匹配的可能性超过至少一个预定阈值时，接收机将重传的数据帧与匹配数据帧组合。 如果匹配的可能性低于任何预定阈值，则接收机根据不超过哪个阈值来存储组合数据帧或重传和匹配数据帧，并发送另一个重传请求。

公开(公告)号：US20050091565A1

公开(公告)日：2005-04-28

申请号：US10971510

申请日：2004-10-22

申请人： Mustafa Eroz ,  Feng-Wen Sun ,  Lin-Nan Lee

发明人： Mustafa Eroz ,  Feng-Wen Sun ,  Lin-Nan Lee

IPC分类号： G06F11/10 ,  H03M13/00 ,  H03M13/11 ,  H03M13/15 ,  H03M13/19 ,  H04L1/00 ,  H04N7/20

CPC分类号： H03M13/255 ,  H03M13/118 ,  H03M13/2906

摘要： An approach is provided for generating Low Density Parity Check (LDPC) codes. An LDPC encoder generates a LDPC code with an outer Bose Chaudhuri Hocquenghem (BCH) code. For a rate 3/5 code, the approach provides a degree profile that yields reduced memory requirements for storage of the edge values without significantly affecting the performance with respect to an “unmodified” rate 3/5 code. The relevant parameters for the reduced memory LDPC codes are as follows: q=72, nldpc=64800, kldpc=nBCH=38880, kBCH=38688. The above approach has particular application in digital video broadcast services over satellite.

摘要翻译： 提供了一种用于生成低密度奇偶校验（LDPC）码的方法。 LDPC编码器生成具有外部Bose Chaudhuri Hocquenghem（BCH）码的LDPC码。 对于速率为3/5的代码，该方法提供了一个程度分布，可以减少存储边缘值的内存需求，而不会显着影响“未修改”速率3/5代码的性能。 减少存储器LDPC码的相关参数如下：q = 72，n×lpc = 64800，k ldpc = n BCH = 38880 ，K BCH = 38688。 上述方法在卫星数字视频广播业务中具有特殊应用。

公开(公告)号：US20050003756A1

公开(公告)日：2005-01-06

申请号：US10883338

申请日：2004-07-01

申请人： Feng-Wen Sun ,  Mustafa Eroz ,  Lin-Nan Lee

发明人： Feng-Wen Sun ,  Mustafa Eroz ,  Lin-Nan Lee

IPC分类号： H03M13/19 ,  H03M13/09 ,  H03M13/11 ,  H04L1/00 ,  H04H1/00

CPC分类号： H03M13/1102 ,  H03M13/2957

摘要： An approach is providing for supporting broadcast transmission of low density parity check (LDPC) coded signals. A receiver includes a decoder configured to decode an LDPC signal to output a decoded signal. The decoder is further configured to operate as an encoder; as such, interference cancellation can be implemented by the encoder re-encoded the received decoded signal. The above approach has particular applicability to satellite broadcast systems.

摘要翻译： 一种方法是提供支持低密度奇偶校验（LDPC）编码信号的广播传输。 接收机包括：解码器，被配置为解码LDPC信号以输出解码信号。 解码器还被配置为作为编码器操作; 因此，干扰消除可以由编码器重新编码接收的解码信号来实现。 上述方法对卫星广播系统具有特别的适用性。

公开(公告)号：US06741581B1

公开(公告)日：2004-05-25

申请号：US09399839

申请日：1999-09-21

申请人： Feng-Wen Sun ,  Lin-Nan Lee ,  Khalid Karimullah

发明人： Feng-Wen Sun ,  Lin-Nan Lee ,  Khalid Karimullah

IPC分类号： H04L116

CPC分类号： H04L1/1812

摘要： A system and method for retransmitting data frames, which were inadequately received by a receiver, back to the receiver to increase receiver gain. Upon receiving a retransmission request from the receiver, the data transmitter retransmits a particular data frame to the receiver without transmitting a signaling message, and the receiver compares it to other data frames stored in a buffer. When a match is believed to exist, the receiver combines the retransmitted data frame with the matching data frame. Based on the result of a cyclic redundant code (CRC) check performed on the combined data frame, the receiver either provides the combined data frame to a higher layer in the receiver, or stores either the combined data frame, or the retransmitted and potentially matching data frame, in the buffer, depending on a confidence in the potential match, and sends another retransmission request to the transmitter to again retransmit the data frame and the above process is repeated.

摘要翻译： 一种用于重传数据帧的系统和方法，其被接收机不足以接收到接收机以增加接收机增益。 在从接收机接收到重传请求时，数据发射机在不发送信令消息的情况下向接收机重传特定数据帧，并且接收机将其与存储在缓冲器中的其它数据帧进行比较。 当相信存在匹配时，接收器将重传的数据帧与匹配的数据帧组合。 基于在组合数据帧上执行的循环冗余码（CRC）检查的结果，接收机将组合数据帧提供给接收机中的较高层，或者存储组合数据帧，或存储组合数据帧，或者重传和潜在匹配 数据帧在缓冲器中取决于潜在匹配的置信度，并且向发送器发送另一个重发请求以再次重发数据帧，并重复上述处理。

公开(公告)号：US06510147B1

公开(公告)日：2003-01-21

申请号：US09115256

申请日：1998-07-13

申请人： Feng-Wen Sun ,  Lin-Nan Lee ,  Khalid Karimullah

发明人： Feng-Wen Sun ,  Lin-Nan Lee ,  Khalid Karimullah

IPC分类号： H04B7216

CPC分类号： H04B1/707 ,  H04J13/0048 ,  H04J13/18 ,  H04W52/26

摘要： A system and method for transmitting wideband signals via a radio communication system adapted for transmitting narrow-band signals is described. A base station is used to transmit and receive a plurality of relatively narrow-band and a plurality of relatively wideband signals. The electromagnetic spectrum available to the plurality of narrow-band signals is selectively shared with the electromagnetic spectrum available to the wideband signals by systematically separating the orthogonal codes and the carrier frequencies used for transmission. The prefixes of the orthogonal codes are preferably mutually exclusive and the carrier frequencies are preferably separated by an offset. The offset may be substantially equal to an integer multiple of the narrow-band signal's chip rate. Alternatively, the offset may be substantially equal to an odd multiple of one half the narrow-band signal's chip rate in which case every other bit of the orthogonally encoded data is inverted.

公开(公告)号：US5603083A

公开(公告)日：1997-02-11

申请号：US393641

申请日：1995-02-24

申请人： Lin-Nan Lee

发明人： Lin-Nan Lee

IPC分类号： H01Q1/24 ,  H01Q21/28 ,  H01Q21/29 ,  H04W16/02 ,  H04W16/12 ,  H04W16/32 ,  H04Q7/36

CPC分类号： H04W16/12 ,  H01Q1/246 ,  H01Q21/28 ,  H01Q21/29 ,  H04W16/02 ,  H04W16/32

摘要： A pattern and a method of establishing a pattern of microcell base station antennae in dense urban areas. The base station antennae are each configured to transmit on one of several sets of frequencies, and are placed at intersections on a grid of horizontally parallel and vertically parallel streets. The pattern distributes the antennae in two separate repeating sequences running diagonally on the grid. By using tall buildings between the streets as propagation blockers, the pattern optimizes the use of a limited number of allocated frequencies and minimizes co-channel and adjacent channel interference.

摘要翻译： 在密集城市地区建立微蜂窝基站天线模式的方式和方法。 基站天线各自被配置为在几组频率之一上传输，并且被放置在水平平行和垂直平行街道的格子上的交点处。 该模式将天线分布在网格上对角线上运行的两个独立的重复序列。 通过在街道之间使用高层建筑作为传播阻挡器，该模式优化了使用有限数量的分配频率并最小化同频道和相邻信道干扰。