Hybrid Precoding Using Out-of-Band Spatial Information for Multi-User Multi-RF-Chain Millimeter Wave Systems
作者： Zhannan Li , Chaozhu Zhang , I-Tai Lu , Xinghua Jia
DOI: 10.1109/ACCESS.2020.2979712
关键词: Beamforming 、 Computer science 、 Spatial multiplexing 、 Communication channel 、 Electronic engineering 、 Multi-user 、 Out-of-band management 、 Precoding 、 Frequency band 、 Bandwidth (signal processing) 、 Telecommunications link
摘要: With a tremendous amount of underutilized bandwidth, millimeter wave (mmWave) communication is promising solution to meet the increasing data-rate demands. To deal with high pathloss in mmWave frequency band, efficient large antenna arrays become crucial provide necessary beamforming and spatial multiplexing gains. Hybrid analog/digital has been an encouraging technique order reduce complexity power consumption arrays. In this paper, we propose low-complexity two-stage hybrid precoding combining scheme for downlink multi-user multi-RF-chain systems using out-of-band information minimize mean-squared error (MMSE) receiving data streams. Particularly, according sparse characteristics channel, utilize more Grassmannian codebooks as training generalize strategy utilizing sub-6GHz constructing multiuser links. The analog problem then formulated weighted signal recovery weights obtained from information. addition, digital derived MMSE multi precoders at transmitters combiners receivers. Numerical results show obvious advantages proposed precoding/combining design various practical scenarios.
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