Achievable rates of multi-user millimeter wave systems with hybrid precoding

Ahmed Alkhateeb, Robert W. Heath, Geert Leus

Research output: Chapter in Book/Report/Conference proceedingConference contribution

40 Scopus citations

Abstract

Millimeter wave (mmWave) systems will likely employ large antenna arrays at both the transmitters and receivers. A natural application of antenna arrays is simultaneous transmission to multiple users, which requires multi-user precoding at the transmitter. Hardware constraints, however, make it difficult to apply conventional lower frequency MIMO precoding techniques at mmWave. This paper proposes and analyzes a low complexity hybrid analog/digital precoding algorithm for downlink multi-user mmWave systems. Hybrid precoding involves a combination of analog and digital processing that is motivated by the requirement to reduce the power consumption of the 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. For this algorithm, we derive a lower bound on the achievable rate for the case of single-path channels, show its asymptotic optimality at large numbers of antennas, and make useful insights for more general cases. Simulation results show that the proposed algorithm offers higher sum rates compared with analog-only beamforming, and approaches the performance of the unconstrained digital precoding solutions.

Original languageEnglish (US)
Title of host publication2015 IEEE International Conference on Communication Workshop, ICCW 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1232-1237
Number of pages6
ISBN (Electronic)9781467363051
DOIs
StatePublished - Jan 1 2015
Externally publishedYes
EventIEEE International Conference on Communication Workshop, ICCW 2015 - London, United Kingdom
Duration: Jun 8 2015Jun 12 2015

Other

OtherIEEE International Conference on Communication Workshop, ICCW 2015
CountryUnited Kingdom
CityLondon
Period6/8/156/12/15

ASJC Scopus subject areas

  • Computer Networks and Communications

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    Alkhateeb, A., Heath, R. W., & Leus, G. (2015). Achievable rates of multi-user millimeter wave systems with hybrid precoding. In 2015 IEEE International Conference on Communication Workshop, ICCW 2015 (pp. 1232-1237). [7247346] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ICCW.2015.7247346