Abstract
Millimeter wave (mmWave) is one of the key technology in the fifth generation mobile communication system. In mmWave system, hybrid precoding is applied to reduce the number of radio frequency (RF) chains. Although narrow band multiuser hybrid precoding is widely studied, only a few works focus on wideband hybrid precoding. The main problem is that all subcarrier share the same analog precoding matrix but the channel information in frequency domain are different. In this paper, we propose a wideband hybrid precoding method based on channel angular information in multiuser-MIMO (MU-MIMO) scenario. Since the channel state information (CSI) in time domain are the same for all subcarriers, we first construct a autocorrelation channel matrix by angular information, which is available for all subcarriers. Then, we propose an iterative method using manifold optimization for analog precoders and combiners to achieve higher sum data rate. Simulation results show that our proposed method is superior to the existing hybrid precoding method and has a close performance to digital ZF precoding.
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