| 比特交织LDPC编码调制系统中的迭代解映射和译码算法 |
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| 引用本文： | 谢求亮,彭克武,潘长勇,杨知行.比特交织LDPC编码调制系统中的迭代解映射和译码算法[J].清华大学学报(自然科学版),2009(8). |
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| 作者姓名： | 谢求亮 彭克武 潘长勇 杨知行 |
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| 作者单位： | 清华大学电子工程系;清华信息科学技术国家实验室; |
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| 摘 要： | 为了提高系统的误码性能,提出将迭代解映射和译码(ID)算法应用于比特交织低密度奇偶校验(LDPC)编码调制系统。对于8PSK G ray映射,该文通过信息传输率分析表明,加性白G auss噪声(AW GN)信道和2/5码率条件下,独立解映射会导致约0.3 dB的信噪比损失,而通过迭代解映射,仿真表明在误码率10-5时挽回了0.2 dB损失。在高码率条件下,信息传输率分析和误码率仿真均表明迭代所能带来的增益非常小。此外,该文预计对于非G ray映射星座或者更高阶星座,迭代算法将带来更大的信噪比增益。
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| 关 键 词： | 低密度奇偶校验 比特交织编码调制 信息传输率 |
Bit-interleaved LDPC coded modulation with iterative demapping and decoding |
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| XIE Qiuliang,PENG Kewu,PAN Changyong,YANG Zhixing.Bit-interleaved LDPC coded modulation with iterative demapping and decoding[J].Journal of Tsinghua University(Science and Technology),2009(8). |
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| Authors: | XIE Qiuliang PENG Kewu PAN Changyong YANG Zhixing |
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| Institution: | 1.Department of Eletronic Engineering;Tsinghua University;Beijing 100084;China;2.Tsinghua National Laboratory for Information Science and Technology;China |
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| Abstract: | This paper describes an iterative demapping and decoding(ID) algorithm for bit-interleaved low-density parity-check(LDPC) coded modulation systems to improve the system performance.Information transmission rate analyses have shown that there is about a 0.3 dB signal to noise ratio(SNR) loss due to independent demapping with 8PSK Gray mapping on an additive white Gaussian noise(AWGN) channel with a 2/5 coding rate.Simulations show that the ID algorithm regains about 0.2 dB of the loss at a bit error rate(BER... |
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