| 用于LDPC编码调制系统的非规则映射技术 |
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| 引用本文： | 刘在爽,程涛,彭克武,王昭诚. 用于LDPC编码调制系统的非规则映射技术[J]. 清华大学学报(自然科学版), 2011, 0(6): 734-738 |
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| 作者姓名： | 刘在爽 程涛 彭克武 王昭诚 |
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| 作者单位： | 清华大学电子工程系清华信息科学与技术国家实验室微波与数字通信国家重点实验室; |
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| 基金项目： | 国家自然科学基金资助项目(61021001); 清华大学自主科研项目(20091081280) |
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| 摘 要： | 为使迭代解映射和译码的低密度奇偶校验(LDPC)编码调制系统获得逼近信道容量的优异性能,该文提出一种基于映射方式搜索的非规则映射技术,采用自适应二元交换算法(ABSA)搜索得到新映射方式,与Gray映射混合得到与信道编码接近最优匹配的非规则映射。对于DVB-T2标准规范的LDPC编码调制系统,在对其方案进行微小修改的前提下,该技术可对迭代解映射系统进行改进,挖掘出可观的迭代增益。以DVB-T2标准64800码长2/3码率的LDPC码和64QAM星座图为例,外信息传递(EXIT)图分析表明:该技术在加性白Gauss噪声(AWGN)信道下理论上可获得0.55dB的信噪比(SNR)增益;误码性能仿真表明:在误码率(BER)10-5时,该技术在AWGN和Rayleigh衰落信道下可分别获得0.30dB和0.26dB的增益。
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| 关 键 词： | 非规则映射 低密度奇偶校验 编码调制 迭代解映射 |
Irregular mapping applications in LDPC coded modulation systems |
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| LIU Zaishuang,CHENG Tao,PENG Kewu,WANG Zhaocheng. Irregular mapping applications in LDPC coded modulation systems[J]. Journal of Tsinghua University(Science and Technology), 2011, 0(6): 734-738 |
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| Authors: | LIU Zaishuang CHENG Tao PENG Kewu WANG Zhaocheng |
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| Affiliation: | LIU Zaishuang,CHENG Tao,PENG Kewu,WANG Zhaocheng (Tsinghua National Laboratory for Information Science & Technology,State Key Laboratory of Microwave & Digital Communications,Department of Electronic Engineering,Tsinghua University,Beijing 100084,China) |
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| Abstract: | An irregular mapping technique was developed with mapping searchs via the adaptive binary switching algorithm(ABSA) with Gray mapping to provide a near-optimal match to a given channel code.The low-density parity check(LDPC) coded modulation system with iterative demapping and decoding can achieve near-capacity performance.A slight modification on the coded modulation scheme from the DVB-T2 standard improves the iterative demapping by exploiting significant iterative gains.An extrinsic information transfer(... |
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| Keywords: | irregular mapping/labeling low-density parity-check(LDPC) coded modulation iterative demapping |
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