Lattice reduction aided belief propagation for massive MIMO detection

Abstract

Efficient massive MIMO detection for practical deployment, which is with spatially correlated channel and high-order modulation, is a challenging topic for the fifth generation mobile communication (5G).In this paper, lattice reduction aided belief propagation (LRA-BP) is proposed for massive MIMO detection.LRA-BP applies the message updating rules of Markov random field based belief propagation (MRF-BP) in lattice reduced MIMO system.With the lattice reduced, well-conditioned MIMO channel, LRA-BP obtains better message updating and detection performance in spatially correlated channel than MRF-BP.Log-domain arithmetic is used in LRA-BP for computational complexity reduction.Simulation result shows that LRA-BP outperforms MRF-BP with 3–10 dB in terms of required SNR for 1% packet error rate in spatially correlated channel for 256-QAM.We also show that LRA-BP requires much lower complexity compared with MRF-BP.