Low Complexity Hybrid Precoding Algorithm in Millimeter Wave MIMO Systems

Abstract

Millimeter wave (mmWave) communication will become a key technology for 5G networks. To combat the high path loss of mmWave, large antenna arrays and directional beamforming are used by mmWave communication systems. However, with the increase of number of antennas, the hardware and energy cost of traditional digital precoder is very high. Hence, hybrid precoding structure is introduced to overcome the difficulty. In this paper, we will propose an iterative heuristic hybrid precoding algorithm with full channel state information. We show that the proposed algorithm achieves near-optimal performance with low complexity. Therefore, the proposed algorithm provides a competitive trade-off strategy between performance and complexity for hybrid precoding design. Moreover, we find that the proposed algorithm is also able to achieve satisfactory spectral efficiency in quantization scenarios.