会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 29. 发明申请
    • METHOD AND APPARATUS FOR DEMULTIPLEXER DESIGN FOR MULTLI-EDGE TYPE LDPC CODED MODULATION
    • 用于多边形类型LDPC编码调制的解复用器设计的方法和装置
    • WO2010083038A2
    • 2010-07-22
    • PCT/US2010000084
    • 2010-01-14
    • THOMSON LICENSINGLEI JINGGAO WEN
    • LEI JINGGAO WEN
    • H04L1/00H03M13/27
    • H04L1/0057H03M13/033H03M13/1165H03M13/253H03M13/255H03M13/6552H03M13/6555H04L1/0041H04L1/0071
    • The capacity-achieving signaling strategy for a particular channel should consider the joint design of channel code and modulation. Nevertheless, coding theorists and practitioners have recognized that a well-designed LDPC code can achieve capacity-approaching performance universally across a range of data transmission and storage channels. A good example is the forward error correction scheme adopted recently by the second generation standards for digital video broadcasting (DVB), wherein the same LDPC code are expected to be reused over satellite, terrestrial and cable channels. However, to accommodate the spectral efficiency of each channel type, the coded bits should be mapped to the modulator judiciously. A large random bit interleaver is employed in BICM system, which typically yields good performance for an arbitrary choice of constellation mapper. However, it is problematic for high-speed implementation of coding and modulation due to the complexity. This motivates us to impose structural simplicity on the bit interleaver configuration so that the coded bits are de-multiplexed systematically into parallel groups to feed the constellation mapper. In this description, we focus on the design of bit demultiplexers for multilevel modulation by applying the framework of multi-edge type (MET) LDPC. Considering the channel-dependence of a given code ensemble is dominated by the mutual information between the channel input and output, we propose to simplify the analysis of the decoding behavior by using a set of surrogate binary erasure channels (BEC). Simulation results indicate that the proposed bit demultiplexer surpasses the performance of the interleaving strategy standardized in DVB-T2.
    • 特定信道的容量实现信令策略应考虑信道码和调制的联合设计。 然而,编码理论家和从业者已经认识到,精心设计的LDPC码可以在数据传输和存储信道的范围内普遍地实现容量接近的性能。 一个很好的例子是最近由数字视频广播(DVB)的第二代标准采用的前向纠错方案,其中相同的LDPC码预期将在卫星,地面和有线电视频道上重复使用。 然而,为了适应每个信道类型的频谱效率,编码比特应该被明智地映射到调制解调器。 在BICM系统中采用大的随机比特交织器,其通常对任意选择星座映射器产生良好的性能。 然而,由于复杂度,编码和调制的高速实现是有问题的。 这促使我们对比特交织器配置施加结构简单性,使得编码比特被系统地去多路复用成并行组以馈送星座映射器。 在本说明书中,我们专注于通过应用多边缘类型(MET)LDPC框架来设计用于多电平调制的位解复用器。 考虑到给定代码集合的通道依赖性由通道输入和输出之间的相互信息支配,我们建议通过使用一组替代二进制擦除通道(BEC)简化解码行为的分析。 仿真结果表明,所提出的比特解复用器超过DVB-T2标准化的交织策略的性能。