Hybrid Beamforing in Massive MIMO

• 1、School of Artificial Intelligence, Beijing University of Posts and Telecommunications, Beijing 100876

Abstract：In recent years, people\'s demand for communication is increasing, and the bandwidth resources of low frequency band are gradually exhausted. As one of the key technologies of the fifth generation mobile communication system (5G), millimeter-wave communication is believed to bring several orders of magnitude improvement in spectrum efficiency and energy efficiency. Thanks to the short wavelength of millimeter wave, a Massive MIMO system can integrate a large number of antenna elements in a small space to obtain large array gains and overcome path losses. However, due to the limitation of hardware cost and energy consumption, the traditional full digital beam technology, which requires one RF link per antenna element, is no longer applicable. To solve this problem, a hybrid digital/analog beamforming architecture was proposed. This paper focuses on the hybrid beamforming technology in Massive MIMO narrow-band system. Taking the sender as an example, it divides the entire beamforming into a low-dimensional baseband digital precoding and a high-dimensional analog precoding. This structure can greatly reduce the hardware overhead and approach the performance of full digital structure beamforming.

Keywords： Information and signal processing Hybrid beamforming Massive MIMO