Efficient MMSE-PIC Detection for Polar-Coded System Using Tree-Structured Gray Codes

This letter proposes an iterative multiple-input multiple-output (MIMO) receiver for polar-coded system using minimum mean-square error parallel interference cancellation (MMSE-PIC) algorithm. And we propose a new kind of tree-structured Gray codes to reduce the computational complexity of MMSE-PIC without performance degradation. Simulation results indicate that, for a 64 $\times $ 4 MIMO system, the iterative detection and decoding (IDD) scheme with different decoding algorithms outperforms the separate detection and decoding (SDD) scheme 0.35 ~ 0.58 dB at the frame error rate (FER) of $10^{-3}$ when the number of iterations is four.