Efficient Compressed Landweber Detector for Massive MIMO

摘要

Massive multiple-input multiple-output (M-MIMO) provides better efficiency and coverage than conventional MIMO. Efficient detector, being indispensable for M-MIMO, is the focus of nowadays research. For M-MIMO, MMSE detector with exact matrix inversion works well but suffers from complexity, not to mention the performance degradation in ill-posed cases. Thus, Landweber detector (LD) and improved Landweber detector (ILD) are considered. In this paper, the compressed Landweber detector (CLD) is proposed with much lower complexity but the same performance as ILD. Numerical results show that for 128×8 MIMO with 64-QAM, CLD approximates MMSE detector with lower complexity. When BER = 10⁴, the gap is only 0:24 dB with 2 iterations. When antenna configuration is 128×60, CLD can achieve 82% complexity reduction than ILD. Unified hardware architecture of ILD is proposed. Folding is considered for further reduction. With the same hardware as ILD, architecture of CLD is finally proposed.