Low-Complexity Hybrid Precoding Design for MIMO-OFDM Millimeter Wave Communications

Yue DONG  Chen CHEN  Na YI  Shijian GAO  Ye JIN  

Publication
IEICE TRANSACTIONS on Communications   Vol.E100-B   No.8   pp.1228-1237
Publication Date: 2017/08/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2016FGP0001
Type of Manuscript: Special Section PAPER (Special Section on Radio Access Technologies for 5G Mobile Communications System)
Category: Wireless Communication Technologies
Keyword: 
5G,  millimeter wave communications,  hybrid precoding,  frequency selectivity,  low-complexity implementation,  

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Summary: 
Hybrid analog/digital precoding has attracted growing attention for millimeter wave (mmWave) communications, since it can support multi-stream data transmission with limited hardware cost. A main challenge in implementing hybrid precoding is that the channels will exhibit frequency-selective fading due to the large bandwidth. To this end, we propose a practical hybrid precoding scheme with finite-resolution phase shifters by leveraging the correlation among the subchannels. Furthermore, we utilize the sparse feature of the mmWave channels to design a low-complexity algorithm to realize the proposed hybrid precoding, which can avoid the complication of the high-dimensionality eigenvalue decomposition. Simulation results show that the proposed hybrid precoding can approach the performance of unconstrained fully-digital precoding but with low hardware cost and computational complexity.