Space-time coded OFDM system for MMDS applications
    1.
    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

    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)。

    SYSTEM AND METHOD FOR EFFICIENT RETRANSMISSION OVER A SATELLINE NETWORK
    7.
    发明申请
    SYSTEM AND METHOD FOR EFFICIENT RETRANSMISSION OVER A SATELLINE NETWORK 有权
    一种用于SATELLINE网络的有效恢复的系统和方法

    公开(公告)号:US20130155943A1

    公开(公告)日:2013-06-20

    申请号:US13328588

    申请日:2011-12-16

    IPC分类号: H04W84/06

    摘要: A method for efficient retransmission over a satellite network including transmitting data packets to VSATs, receiving retransmission requests for at least one of the data packets from the VSATs, generating a retransmission packet based on the retransmission requests using XOR summing, transmitting the retransmission packet to the plurality of VSATs.

    摘要翻译: 一种通过卫星网络有效重传的方法,包括向VSAT发送数据分组,从VSAT接收至少一个数据分组的重传请求,根据使用XOR求和的重传请求生成重传分组,将重传分组发送给 多个VSAT。

    Method and system for providing low density parity check (LDPC) encoding and decoding
    8.
    发明授权
    Method and system for providing low density parity check (LDPC) encoding and decoding 有权
    用于提供低密度奇偶校验(LDPC)编码和解码的方法和系统

    公开(公告)号:US08402341B2

    公开(公告)日:2013-03-19

    申请号:US12707766

    申请日:2010-02-18

    摘要: An approach is provided for processing structure Low Density Parity Check (LDPC) codes. Memory storing edge information and a posteriori probability information associated with a structured parity check matrix used to generate Low Density Parity Check (LDPC) coded signal are accessed. The edge information represent relationship between bit nodes and check nodes, and are stored according to a predetermined scheme that permits concurrent retrieval of a set of the edge information.

    摘要翻译: 提供了一种用于处理结构低密度奇偶校验(LDPC)码的方法。 访问与用于生成低密度奇偶校验(LDPC)编码信号的结构奇偶校验矩阵相关联的存储边缘信息和后验概率信息。 边缘信息表示位节点和校验节点之间的关系,并且根据允许并发检索一组边缘信息的预定方案来存储。

    METHOD AND APPARATUS FOR A PARAMETERIZED INTERLEAVER DESIGN PROCESS
    10.
    发明申请
    METHOD AND APPARATUS FOR A PARAMETERIZED INTERLEAVER DESIGN PROCESS 有权
    用于参数交互设计过程的方法和装置

    公开(公告)号:US20120124453A1

    公开(公告)日:2012-05-17

    申请号:US13231474

    申请日:2011-09-13

    IPC分类号: H03M13/27 G06F11/10

    摘要: A parameterized interleaver design process is provided, which optimizes the design for interleavers of any size, and can be completely specified using only a few design parameters. According to the parameterized interleaver design process an interleaver π(i) of a length N is generated. A number of subpermutation masks are defined, and a first intermediate interleaver permutation is partitioned into a number of subgroups, wherein the number of subgroups corresponds with the number of subpermutation masks. Each of the subgroups of the first intermediate interleaver permutation is partitioned into a number of further subgroups, and each of the subpermutation masks is applied to each of the further subgroups of a corresponding subgroup of the first intermediate interleaver permutation, resulting in a corresponding portion of a second intermediate interleaver permutation. The resulting interleaver π(i) is generated based at least in part on the first and second intermediate interleaver permutations.

    摘要翻译: 提供了一种参数化的交织器设计过程,其优化了任何尺寸的交织器的设计,并且可以仅使用少量设计参数来完全指定。 根据参数化交织器设计过程,生成长度为N的交织器(i)。 定义了多个子鉴别掩码,并且将第一中间交织器置换分割成多个子组,其中子组的数量对应于子鉴别掩码的数量。 第一中间交织器置换的每个子组被划分成多个其他子组,并且每个子精确掩码被应用于第一中间交织器排列的相应子组的其他子组中的每一个,导致相应部分 第二中间交织器排列。 至少部分地基于第一和第二中间交织器排列来生成所产生的交织器(i)。