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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8PSKGray映射,该文通过信息传输率分析表明,加性白Gauss噪声(AWGN)信道和2/5码率条件下,独立解映射会导致约0.3dB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0.2dB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Gray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。
In order to improve the error performance of the system, an iterative demapping and decoding (ID) algorithm is proposed for the bit-interleaved low density parity check (LDPC) coding and modulation system. In the case of 8PSKGray mapping, the information transmission rate analysis shows that independent white Gaussian noise (AWGN) channels and 2/5 code rate de-mapping will lead to a signal-to-noise ratio loss of about 0.3dB. By iterative demapping , The simulation shows that when the bit error rate of 10-5 saved 0.2dB loss. Under the condition of high code rate, both the information transmission rate analysis and the bit error rate simulation show that the iterative gain is very small. In addition, the paper predicts that for non-Gray mapped constellation or higher order constellation, the iterative algorithm will bring greater SNR gain.