空间通信高码率QC-LDPC码的优化构造
发布时间：2019-02-28 07:52
【摘要】：为了研究高纠错性能和易实现的高码率准循环低密度奇偶校验(quasi-cyclic low-density parity-check,QCLDPC)码,提出了基于原模图扩展的码优化构造方法:根据优化的基本原模图模板,通过扩展该图校验节点关联的复合变量节点,且增加其子矩阵的维度,构造所需码长、码率的高码率码。采用针对准循环结构基矩阵的渐进边增长(progressive edge growth,PEG)扩展和准循环-渐进环外消息度(quasi-cyclic approximated cycle extrinsic message degree,QC-ACE)优化搜索循环置换子矩阵偏移量,联合优化与改善编码码字的围长与环分布关系,来提高码字的误码率性能。仿真表明:采用该方法构造的编码具有较好的误比特率性能,且高码率码具有高频谱效率,该方法可用于设计高速空间信息传输所需的高效编码。
[Abstract]:In order to study the high error correction performance and easy realization of high bit rate quasi cyclic low density parity check (quasi-cyclic low-density parity-check,QCLDPC) codes, a code optimization method based on extended primitive pattern is proposed. By extending the complex variable node associated with the checkout node in the graph and increasing the dimension of its submatrix, a high code rate code with the required code length and bit rate is constructed. The asymptotic edge growth (progressive edge growth,PEG) extension for quasi-cyclic structural basis matrix and the quasi-cyclic-asymptotic outer message degree (quasi-cyclic approximated cycle extrinsic message degree,QC-ACE) are used to optimize the searching cyclic replacement submatrix offsets. In order to improve the bit error rate (BER) performance of the codeword, the relationship between the girth and the ring distribution of the codeword is optimized and improved jointly. Simulation results show that the proposed method has good bit error rate (BER) performance and high spectral efficiency. The proposed method can be used to design efficient coding for high-speed spatial information transmission.
【作者单位】： 杭州电子科技大学通信工程学院;东南大学移动通信国家重点实验室;
【基金】：浙江省自然科学基金项目(LY17F010019) 国家自然科学基金项目(61471152) 浙江省科技计划项目(2015C31103) 东南大学移动通信国家重点实验室开放研究项目(2014D02)
【分类号】：TN911.22
[Abstract]:In order to study the high error correction performance and easy realization of high bit rate quasi cyclic low density parity check (quasi-cyclic low-density parity-check,QCLDPC) codes, a code optimization method based on extended primitive pattern is proposed. By extending the complex variable node associated with the checkout node in the graph and increasing the dimension of its submatrix, a high code rate code with the required code length and bit rate is constructed. The asymptotic edge growth (progressive edge growth,PEG) extension for quasi-cyclic structural basis matrix and the quasi-cyclic-asymptotic outer message degree (quasi-cyclic approximated cycle extrinsic message degree,QC-ACE) are used to optimize the searching cyclic replacement submatrix offsets. In order to improve the bit error rate (BER) performance of the codeword, the relationship between the girth and the ring distribution of the codeword is optimized and improved jointly. Simulation results show that the proposed method has good bit error rate (BER) performance and high spectral efficiency. The proposed method can be used to design efficient coding for high-speed spatial information transmission.
【作者单位】： 杭州电子科技大学通信工程学院;东南大学移动通信国家重点实验室;
【基金】：浙江省自然科学基金项目(LY17F010019) 国家自然科学基金项目(61471152) 浙江省科技计划项目(2015C31103) 东南大学移动通信国家重点实验室开放研究项目(2014D02)
【分类号】：TN911.22
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