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中文摘要：
本文提出了一种多层叠加LDPC码编码调制系统.与传统的基于速率分配的多层编码调制技术相比,多层叠加编码调制系统具有很好的对称性和可扩展性.通过分析比较Turbo码译码算法与LDPC码的译码算法的复杂度,本文指出了多层叠加LDPC码编码调制系统具有译码简单,易于实现的优点.实验结果表明,多层叠加LDPC码编码调制系统可以在不牺牲带宽的同时获得较好的性能.
英文摘要：
In this paper, we propose a multilevel coded modulation system based on superimposed LDPC codes. Compared with traditional multilevel coding techniques, superimposed coded modulation system is symmetric among different layers and hence can be expanded easily.By comparing the decoding complexity of LDPC codes with that of turbo codes, we point out that the proposed superimposed LDPC coded modolation system can be easily designed and implemented. Simulation results show that superimposed LDPC coded modulation system has good performance without sacrificing bandwidth.
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