利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

59 条记录 (耗时 0.023 秒)

    Method of generating space-time codes for generalized layered space-time architectures
    1.
    发明授权
    Method of generating space-time codes for generalized layered space-time architectures 有权
    为广义分层时空架构生成时空代码的方法

    公开(公告)号：US06560295B1

    公开(公告)日：2003-05-06

    申请号：US09613607

    申请日：2000-07-11

    申请人： A. Roger Hammons, Jr. ,  Hasham El Gamal

    发明人： A. Roger Hammons, Jr. ,  Hasham El Gamal

    IPC分类号： H04L2704

    CPC分类号： H04L1/0059 ,  H04L1/065

    摘要： Space-time codes for use with layered architectures with arbitrary numbers of antennas are provided such as rate k/n convolutional codes (e.g., rates higher than or equal to 1/n where n is the number of transmit antennas). Convolutional codes for layered space-time architectures are generated using matrices over the ring F[[D]] of formal power series in variable D.

    摘要翻译： 提供了使用具有任意数量天线的分层架构的时空码，例如速率k / n卷积码（例如，高于或等于1 / n的速率，其中n是发射天线的数量）。 用于分层时空架构的卷积码是通过变量D中正规幂级数的环F [[D]]上的矩阵生成的。

    Sets of rate-compatible universal turbo codes nearly optimized over various rates and interleaver sizes
    3.
    发明授权
    Sets of rate-compatible universal turbo codes nearly optimized over various rates and interleaver sizes 有权
    速率兼容的通用turbo码的集合在各种速率和交织器大小上几乎被优化

    公开(公告)号：US07925963B2

    公开(公告)日：2011-04-12

    申请号：US12435237

    申请日：2009-05-04

    申请人： Mustafa Eroz ,  A. Roger Hammons, Jr.

    发明人： Mustafa Eroz ,  A. Roger Hammons, Jr.

    IPC分类号： H03M13/27

    CPC分类号： H03M13/2957 ,  H03M13/258 ,  H03M13/6312 ,  H03M13/6381 ,  H04L1/005 ,  H04L1/0066 ,  H04L1/0069

    摘要： A method and apparatus for Turbo encoding uses a set of rate-compatible Turbo Codes optimized at high code rates and derived from a universal constituent code. The Turbo Codes have rate-compatible puncturing patterns.The method comprises: encoding a signal at a first and second encoder using a best rate 1/2 constituent code universal with higher code rates, the first encoder and the second encoder each producing a respective plurality of parity bits for each information bit; puncturing the respective plurality of parity bits at each encoder with a higher rate best puncturing patterns; and puncturing the respective plurality of parity bits at each encoder with a lower rate best puncturing pattern. In a variation, the best rate 1/2 constituent code represents a concatenation of polynomials 1+D2+D3 (octal 13) and 1+D+D3 (octal 15), D a data bit. A Turbo Encoder is provided which has hardware to implement the method.

    摘要翻译： 用于Turbo编码的方法和装置使用一组以高码率优化并由通用组成码导出的速率兼容Turbo码。 Turbo码具有速率兼容的穿孔模式。 该方法包括：使用具有较高码率的通用最佳速率1/2构成码在第一和第二编码器处对信号进行编码，第一编码器和第二编码器为每个信息比特产生相应的多个奇偶校验位; 在每个编码器处以更高速率的最佳穿孔模式对相应的多个奇偶校验位进行穿孔; 以及在每个编码器处以较低速率的最佳打孔图案对相应的多个奇偶校验位进行穿孔。 在一个变型中，最佳速率1/2分量代码表示多项式1 + D2 + D3（八进制13）和1 + D + D3（八进制15），D是数据比特的级联。 提供了一种具有执行该方法的硬件的Turbo编码器。

    Method and system for utilizing space-time and space-frequency codes for multi-input multi-output frequency selective fading channels
    5.
    发明授权
    Method and system for utilizing space-time and space-frequency codes for multi-input multi-output frequency selective fading channels 有权
    用于多输入多输出频率选择性衰落信道的空时和空频码的方法和系统

    公开(公告)号：US07483476B2

    公开(公告)日：2009-01-27

    申请号：US11983590

    申请日：2007-11-09

    申请人： Hesham El-Gamal ,  A. Roger Hammons, Jr.

    发明人： Hesham El-Gamal ,  A. Roger Hammons, Jr.

    IPC分类号： H04L27/30

    CPC分类号： H04B7/0669 ,  H04L1/04 ,  H04L1/0606 ,  H04L1/0618 ,  H04L1/0631 ,  H04L1/065

    摘要： A communication system for transmitting encoded signals over a communication channel is disclosed. The system includes a transmitter, which has a source that outputs a message signal. The transmitter also includes an encoder that generates a code word in response to the message signal. The code word has a construction that defines a plurality of paths associated with an intersymbol interference (ISI) environment of the communication channel, wherein the code word achieves a diversity based upon the number of transmit antennas and the number of ISI paths. Further, the transmitter includes a modulator that modulates the code word for transmission over the communication channel, and multiple antennas that transmit the modulated code word over the communication channel. The system encompasses a receiver that receives the transmitted code word via a number of receive antennas.

    摘要翻译： 公开了一种用于通过通信信道发送编码信号的通信系统。 该系统包括发射机，其具有输出消息信号的源。 发射机还包括响应于消息信号产生码字的编码器。 代码字具有定义与通信信道的符号间干扰（ISI）环境相关联的多个路径的结构，其中码字基于发射天线的数量和ISI路径的数量实现分集。 此外，发射机包括调制器，用于调制通过通信信道传输的码字，以及通过通信信道发送调制码字的多个天线。 该系统包括接收经由多个接收天线发送的码字的接收机。

    Space-time coded OFDM system for MMDS applications
    7.
    发明授权
    Space-time coded OFDM system for MMDS applications 有权
    用于MMDS应用的时空编码OFDM系统

    公开(公告)号：US07342875B2

    公开(公告)日：2008-03-11

    申请号：US10012066

    申请日：2001-11-05

    申请人： A. Roger Hammons, Jr. ,  Hesham El-Gamal ,  Lin-Nan Lee ,  Stan Kay ,  Andrew MacDonald ,  Jack Rozmaryn ,  Bassel Beidas

    发明人： A. Roger Hammons, Jr. ,  Hesham El-Gamal ,  Lin-Nan Lee ,  Stan Kay ,  Andrew MacDonald ,  Jack Rozmaryn ,  Bassel Beidas

    IPC分类号： G01R31/08

    CPC分类号： H04L27/2602 ,  H04L1/0618

    摘要： A communications system includes a base station that is configured to transmit a signal that is modulated according to a predetermined modulation scheme and an orthogonal frequency division multiplexing scheme, wherein the signal is encoded using space-frequency coding. The base station includes a plurality of multiple-input multiple-output (MIMO) transceivers. The system includes a terminal that is configured to receive the modulated signal. The above arrangement is particularly applicable to providing multichannel multipoint distribution services (MMDS) over a radio communications system.

    摘要翻译： 通信系统包括：基站，被配置为发送根据预定调制方案和正交频分复用方案调制的信号，其中，使用空频编码来对信号进行编码。 基站包括多个多输入多输出（MIMO）收发器。 该系统包括被配置为接收调制信号的终端。 上述布置特别适用于通过无线电通信系统提供多信道多点分发业务（MMDS）。

    Interleaver design for parsed parallel concatenated codes
    8.
    发明授权
    Interleaver design for parsed parallel concatenated codes 有权
    用于解析并行级联代码的交织器设计

    公开(公告)号：US06697990B2

    公开(公告)日：2004-02-24

    申请号：US09734841

    申请日：2000-12-13

    申请人： Hesham El-Gamal ,  A. Roger Hammons, Jr. ,  Mustafa Eroz

    发明人： Hesham El-Gamal ,  A. Roger Hammons, Jr. ,  Mustafa Eroz

    IPC分类号： H03M1300

    CPC分类号： H04L1/0041 ,  H03M13/2746 ,  H03M13/2771 ,  H03M13/296 ,  H03M13/2987 ,  H03M13/6362 ,  H04L1/0066 ,  H04L1/0068 ,  H04L1/0071

    摘要： A method and apparatus for interleaving an input data stream for parsed parallel concatenated code encoding, the method comprising the steps of: parsing the input data stream into a plurality of parsed data substreams; and forming sets of shared information bits, wherein each of the sets of shared information bits comprises information bits in common with respective pairs of the plurality of parsed data substreams. In a variation, a further step comprises constructing constituent permutations of one or more of the sets of shared information bits. In yet a further variation, a further step comprises interlacing respective pairs of the sets of shared information bits to form respective interleaved data substreams.

    摘要翻译： 一种用于交织用于解析的并行级联码编码的输入数据流的方法和装置，所述方法包括以下步骤：将所述输入数据流解析成多个解析数据子流; 以及形成共享信息比特组，其中所述共享信息比特组中的每一个包含与所述多个解析数据子流中的相应对共同的信息比特。 在一个变型中，另一步骤包括构成一组或多组共享信息比特的组成置换。 在又一变型中，另一步骤包括交织各组共享信息比特组以形成相应的交错数据子流。

    System and method employing a rate matching algorithm for providing optimized puncturing patterns for turbo encoded data in a communications network
    10.
    发明授权
    System and method employing a rate matching algorithm for providing optimized puncturing patterns for turbo encoded data in a communications network 有权
    使用速率匹配算法的系统和方法，用于在通信网络中为turbo编码数据提供优化的穿孔模式

    公开(公告)号：US06601214B1

    公开(公告)日：2003-07-29

    申请号：US09558359

    申请日：2000-04-26

    申请人： A. Roger Hammons, Jr.

    发明人： A. Roger Hammons, Jr.

    IPC分类号： H03M1335

    CPC分类号： H04L1/0066 ,  H04L1/0041 ,  H04L1/0068 ,  H04L1/0069

    摘要： A system and method employing a rate matching algorithm for providing an optimized pattern for puncturing parity bits of a turbo encoded data word of a given rate to produce a turbo encoded data word of a desired lower rate, to thus eliminate bits from said turbo encoded data word to be transmitted by a transmitter. The system and method determine a final amount of bits to be transmitted in the encoded data word, and determine, based on the final amount of bits in relation to the original number of bits in the encoded data word, the number of parity bits to be eliminated from transmission in the encoded data word. Because the parity bits typically have been inserted into the encoded data word by different encoders, the system and method uses a rate matching algorithm to provide an optimized pattern for puncturing the parity bits so that substantially the same number of parity bits provided by each encoder are punctured.

    摘要翻译： 一种采用速率匹配算法的系统和方法，用于提供用于对给定速率的turbo编码数据字进行奇偶校验位的打孔的优化模式，以产生期望的较低速率的turbo编码数据字，从而消除来自所述turbo编码数据的比特 发射机要传输的字。 系统和方法确定要在编码数据字中发送的最终比特量，并且基于与编码数据字中的原始比特数相关的比特的最终数量，确定奇偶校验比特数 从编码数据字中的传输中消除。 由于奇偶校验位通常由不同的编码器插入到编码数据字中，所以系统和方法使用速率匹配算法来提供用于对奇偶校验位进行删截的优化模式，使得由每个编码器提供的基本上相同数目的奇偶校验位 刺伤