Low-resolution precoding techniques have gained considerable attention in the wireless communications area recently. Vital but hardly discussed in literature, discrete precoding in conjunction with channel coding is the subject of this study. Unlike prior studies, we propose three different soft detection methods and an iterative detection and decoding scheme that allow the utilization of channel coding in conjunction with low-resolution precoding. Besides an exact approach for computing the extrinsic information, we propose two approximations with reduced computational complexity. Numerical results based on PSK modulation and an LDPC block code indicate a superior performance as compared to the system design based on the common AWGN channel model in terms of bit-error-rate.
翻译:与先前的研究不同,我们建议采用三种不同的软检测方法和迭代检测和解码办法,以便利用与低分辨率预码相结合的频道编码。除了计算外部信息的一种精确方法外,我们建议两种近似法,降低计算复杂性。基于PSK调制的数值和LDPC区块代码的数值结果显示,与基于UWGN共同频道模型的系统设计相比,在比特机率方面,比UCTN频道模型的系统设计效果要好。