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提出一种利用网格编码调制将低密度校验码与高阶数字调制相结合的应用方法,其中在网格编码调制中采用递归系统卷积码进行编码用以实现基于对数似然比的软译码方法,构造了低密度校验码和网格编码调制相结合的编译码系统。仿真结果表明,该方案将低密度校验码的高编码增益与多元调制的高频谱利用率有效结合在一起,是一种功率和频谱高效的编码调制方式,比传统的网格编码方式有更好的性能。
An application method of combining low-density parity-check code with high-order digital modulation using trellis-coded modulation is proposed, in which a recursive systematic convolutional code is used for encoding in trellis-coded modulation to implement a method based on a log-likelihood ratio Soft decoding method, constructed a low-density parity-check code and the combination of grid coding modulation coding system. The simulation results show that the proposed scheme effectively combines the high coding gain of low density parity check codes with the high spectral efficiency of multivariate modulation and is a power and spectrum efficient coding and coding scheme that is more efficient than traditional trellis coding Good performance.