Limited Feedback Hybrid Precoding for Multi-User Millimeter Wave Systems

Ahmed Alkhateeb, Geert Leus, Robert W. Heath

Research output: Contribution to journalArticle

536 Scopus citations

Abstract

Antenna arrays will be an important ingredient in millimeter-wave (mmWave) cellular systems. A natural application of antenna arrays is simultaneous transmission to multiple users. Unfortunately, the hardware constraints in mmWave systems make it difficult to apply conventional lower frequency multiuser MIMO precoding techniques at mmWave. This paper develops low-complexity hybrid analog/digital precoding for downlink multiuser mmWave systems. Hybrid precoding involves a combination of analog and digital processing that is inspired by the power consumption of complete radio frequency and mixed signal hardware. The proposed algorithm configures hybrid precoders at the transmitter and analog combiners at multiple receivers with a small training and feedback overhead. The performance of the proposed algorithm is analyzed in the large dimensional regime and in single-path channels. When the analog and digital precoding vectors are selected from quantized codebooks, the rate loss due to the joint quantization is characterized, and insights are given into the performance of hybrid precoding compared with analog-only beamforming solutions. Analytical and simulation results show that the proposed techniques offer higher sum rates compared with analog-only beamforming solutions, and approach the performance of the unconstrained digital beamforming with relatively small codebooks.

Original languageEnglish (US)
Article number7160780
Pages (from-to)6481-6494
Number of pages14
JournalIEEE Transactions on Wireless Communications
Volume14
Issue number11
DOIs
StatePublished - Nov 1 2015
Externally publishedYes

Keywords

  • limited-feedback
  • Millimeter wave communication
  • multi-user hybrid precoding

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

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