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›› 2018, Vol. 35 ›› Issue (5): 696-703.DOI: 10.7523/j.issn.2095-6134.2018.05.017

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Energy-efficient hybrid precoding design based on RF chains selection for millimeter wave MIMO systems

SUN Jihan, QIU Ling   

  1. Key Laboratory of Wireless-Optical Communications of Chinese Academy of Sciences, University of Science and Technology of China, Hefei 230027, China
  • Received:2017-06-23 Revised:2017-10-23 Online:2018-09-15

Abstract: In order to reduce the radio frequency (RF) chains cost and satisfy the high capacity demand for communication systems, millimeter wave hybrid precoding with limited RF chains is proposed to make a tradeoff between hardware cost and system performance. In this work, we study the energy-efficient hybrid precoding design problem based on RF chains selection for a millimeter wave multi-user multiple-input multiple-output (MIMO) system. First, we use the predesigned analog precoding codebook to reformulate the original problem as a sparse digital precoding problem. Then we solve it iteratively using successive convex approximation (SCA) method combined with fractional programming method. The simulation results show that our proposed algorithm gives the performance very close to that of the exhaustive search and better than those of the other existed algorithms.

Key words: millimeter wave MIMO communications, hybrid precoding, radio frequency chains selection, energy efficiency

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