Low Complexity and Robust Codebook-Based Analog Beamforming for Millimeter Wave MIMO Systems
Yong Niu,
Ziqi Feng,
Min Chen,
Yong Li,
Zhangdui Zhong,
Bo Ai
Affiliations
Yong Niu
State Key Laboratory of Rail Traffic Control and Safety, School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing, China
Ziqi Feng
Department of Electronic Engineering, State Key Laboratory on Microwave and Digital Communications, Tsinghua National Laboratory for Information Science and Technology, Tsinghua University, Beijing, China
Department of Electronic Engineering, State Key Laboratory on Microwave and Digital Communications, Tsinghua National Laboratory for Information Science and Technology, Tsinghua University, Beijing, China
Zhangdui Zhong
State Key Laboratory of Rail Traffic Control and Safety, School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing, China
Bo Ai
State Key Laboratory of Rail Traffic Control and Safety, School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing, China
Millimeter-wave (mm-Wave) MIMO systems have been proposed to achieve higher spectral efficiency via the hybrid beamforming structure, which consists of analog beamforming and digital beamforming. In analog beamforming, each antenna subarray generates a codebook-based directional beam, which determines the equivalent MIMO channel. Then, digital beamforming can be applied to fully exploit the spatial multiplexing gain of MIMO channels. In this paper, we propose a low-complexity analog beam selection scheme to achieve near-optimal spectral efficiency for the split hybrid beamforming system. The core of our scheme is the beam selection criterion, which is derived from capacity analysis. Furthermore, we propose a beam switching algorithm to ensure the robustness when blockage occurs. Through simulations under different channel conditions, the near-optimal performance of our scheme is demonstrated, and the beam switching algorithm is able to ensure robust network connectivity and achieve higher channel capacity when the blockage is relived.
