In this paper,a family of rate-compatible(RC) low-density parity-check(LDPC) convolutional codes can be obtained from RC-LDPC block codes by graph extension method.The resulted RC-LDPC convolutional codes,which are de...In this paper,a family of rate-compatible(RC) low-density parity-check(LDPC) convolutional codes can be obtained from RC-LDPC block codes by graph extension method.The resulted RC-LDPC convolutional codes,which are derived by permuting the matrices of the corresponding RC-LDPC block codes,are systematic and have maximum encoding memory.Simulation results show that the proposed RC-LDPC convolutional codes with belief propagation(BP) decoding collectively offer a steady improvement on performance compared with the block counterparts over the binary-input additive white Gaussian noise channels(BI-AWGNCs).展开更多
极化码(Polar)作为目前唯一一种从理论上证明了能够达到香农(Shannon)极限的码字,且编译码复杂度低,已成为编码领域的一大研究热点。然而,受信道极化速度的限制,有限码长的Polar码性能劣于当前应用比较成熟的LDPC码,Turbo码等。基于此,...极化码(Polar)作为目前唯一一种从理论上证明了能够达到香农(Shannon)极限的码字,且编译码复杂度低,已成为编码领域的一大研究热点。然而,受信道极化速度的限制,有限码长的Polar码性能劣于当前应用比较成熟的LDPC码,Turbo码等。基于此,提出了基于两级极化的级联编码方案,并针对该编码方案采用了改进的译码算法,实现了有限码长Polar码的性能提升。仿真结果显示,性能提升约0.3 d B。文章的研究成果将为提升有限码长Polar码性能开辟一条有效途径。展开更多
基金the National Natural Science Foundation of China(Nos.61401164,61471131 and 61201145)the Natural Science Foundation of Guangdong Province(No.2014A030310308)
文摘In this paper,a family of rate-compatible(RC) low-density parity-check(LDPC) convolutional codes can be obtained from RC-LDPC block codes by graph extension method.The resulted RC-LDPC convolutional codes,which are derived by permuting the matrices of the corresponding RC-LDPC block codes,are systematic and have maximum encoding memory.Simulation results show that the proposed RC-LDPC convolutional codes with belief propagation(BP) decoding collectively offer a steady improvement on performance compared with the block counterparts over the binary-input additive white Gaussian noise channels(BI-AWGNCs).
文摘极化码(Polar)作为目前唯一一种从理论上证明了能够达到香农(Shannon)极限的码字,且编译码复杂度低,已成为编码领域的一大研究热点。然而,受信道极化速度的限制,有限码长的Polar码性能劣于当前应用比较成熟的LDPC码,Turbo码等。基于此,提出了基于两级极化的级联编码方案,并针对该编码方案采用了改进的译码算法,实现了有限码长Polar码的性能提升。仿真结果显示,性能提升约0.3 d B。文章的研究成果将为提升有限码长Polar码性能开辟一条有效途径。
