32、rcorrecting codes J.IEEE Transactions on Information Theory ,1977,23(3:371-377.图12多进制对称信道1-(M -1P P P P PP1-(M -1P 1-(M -1PM -1M -11100P 图10四进制AWGN 虚拟信道下相关信源的分布式编码1.21.00.60.8 1.01.21.4H(X|Y 不分级分级Slepian-Wolf 极限图11八进制AWGN 虚拟信道下...
低密度奇偶校验码(Low-Density Pariy-Check codes,LDPC codes)是一种基于图和迭代译码的信道编码方案,它是据Turbo码的另外一种性能非常接近Shannon极限的信道编码.本文在探讨了LDPC码的 经典BP(Belief ProPagation)译码算法的基础上,采用一种改进行的复杂度较低,性能较好的LLRBP译码算法在FPGA上进行实现,验证了LDPC码...
itcandecreasethecomputationsgreatlyandmakethehardwarere—alizationeasierKeywords:LDPCcodes,BPalgorithm,Mackay—Nealalgorithm,log—BPalgorithm,computationalcomplexityLDPC(LowDensityParityCheck)码[是Gallager于1962年提出的一类可以用非常稀疏的奇偶校验矩阵或Tanner图定义的线性分组纠错码,同时证明了LDPC码在码长很长的情况...
1学号:200906307002分类号:TN911.22一种有效QC-LPDC设计及编译码器FPGA实现研究生姓名:***教师:**训教授学科门类:工科专业名称:信号与信息处理论文提交日期:2012年3月I摘要人们对于通信的质量的要求目前正伴随着通信技术区域的飞速发展不断的提高。LDPC(低密度奇偶校验,Low-DensityParity-CheckCodes)码被Gallager在1962...
This disclosure describes mechanisms for performing rate matching in low-density parity check (LPDC) codes in a wireless network. A device may generate an Aggregated Media Access (MAC) Protocol Data Unit (AMPDU) payload having an AMPDU payload size associated with a number of bits. The device...
The proposed ACE algorithm for construction of the LDPC codes ensures that short cycles contain at least a given minimum number of "extrinsic paths", leading to an increase in the minimum size of stopping sets. This approach provides an improvement of LDPC error-floor and decoding performance....
Execution of the method during encoding the data on the emitter (8) of a telecommunication system. Generation of lower data transmission rates and an improvement in the performance of the error probability of the system in dependence with the signal-to-noise ratio on the receiver. The extension...
A method of encoding a quasi-cyclic low-density parity-check (QC LDPC) code supporting multiple base codes includes selecting a base code for generating a parity check matrix from among a first base code and a second base code, selecting a lifting value for generating the parity check matrix...
Structure is imposed on the LDPC codes by restricting portion part of the parity check matrix to be lower triangular and/or satisfying other requirements such that the communication between bit nodes and check nodes of the decoder (305) is simplified. Further, a cyclic redundancy check (CRC) ...
Certain aspects of the present disclosure provide low-density parity-check (LDPC) codes having pairwise orthogonality of adjacent rows, and a new decoder that exploits the pairwise row orthogonality for flexible decoder scheduling without performance loss. An apparatus includes a receiver configured to...