Joint Source-Channel Code Modulation Scheme Based on Variable-length Error-Correct Code and Doping Modulation
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摘要: 针对无线通信中存在的频谱资源有限、信道衰落和多径效应等问题，该文将可变长纠错(VLEC)编码和掺杂调制相结合，提出一种新的联合信源信道编码调制方法。该方法利用外信息转移(EXIT)图分析系统的迭代译码特性，优化设计可变长纠错编码和掺杂调制的参数。主要包括：设计有更大自由距离的可变长码，使其具有纠错能力；设计优化掺杂调制的掺杂和映射规则的方法，使掺杂调制EXIT曲线与可变长纠错编码EXIT曲线匹配，降低迭代译码收敛所需的信噪比(SNR)。仿真结果表明，在AWGN信道和瑞利衰落信道下，该联合信源信道编码调制方法与分离的信源信道编码调制方相比，迭代收敛所需的信噪比减小了1 dB以上，相比其他的联合信源信道编码调制方法，也有更好的误码率性能。在误码率为10–4时，该方法距离AWGN信道和瑞利衰落信道的香农限分别为0.7 dB和1.0 dB。Abstract: To deal with effects of limited spectrum, fading and multipath during wireless communication, a new joint source-channel code modulation scheme is proposed. This scheme consists of a Variable-Length Error-Correct (VLEC) code and doping modulation. With the aid of EXtrinsic Information Transfer (EXIT) chart analysis for the iterative decoding characteristics, the parameters of VLEC and doping modulation are designed. The design includes: A variable-length code with large free distance is constructed to provide error correction capability; The doping code and mapping of modulation are optimized to make the EXIT curve of doping modulation match with the EXIT curve of VLEC, and hence the Signal-to-Noise Ratio (SNR) required for iterative decoding convergence is reduced. Simulation results show that over AWGN channel and Rayleigh fading channel, the proposed scheme has more than 1 dB SNR gains compared with the separated source-channel code modulation and has the best performance compared with other joint source-channel code modulation schemes. Also, at the symbol error rate of 10-4, the performance of the proposed system is 0.7 dB and 1.0 dB away from the Shannon limit, respectively.
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