Multiuser MIMO Systems with Discrete Precoding and Adjusted Soft Receiver Design with PSK Modulation
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Low-resolution precoding techniques gained considerable attention in the wireless communications area recently. Unlike prior studies, the proposed work considers a coded transmission with a soft detection process. Based on the assumption that the distortion brought by the discrete precoding is Gaussian distributed, different approaches about the computation of effective log-likelihood-ratios are presented in the study. Numerical results based on PSK modulation and an LDPC block code indicate a superior performance as compared to state-of-the-art system designs in terms of bit-error-rate.
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