Channel estimation and hybrid combining for mmWave: Phase shifters or switches?

Roi Mendez-Rial, Cristian Rusu, Ahmed Alkhateeb, Nuria Gonzalez-Prelcic, Robert W. Heath

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

120 Scopus citations

Abstract

Precoding/combining and large antenna arrays are essential in millimeter wave (mmWave) systems. In traditional MIMO systems, precoding/combining is usually done digitally at baseband with one radio frequency (RF) chain and one analog-to-digital converter (ADC) per antenna. The high cost and power consumption of RF chains and ADCs at mmWave frequencies make an all-digital processing approach prohibitive. When only a limited number of RF chains is available, hybrid architectures that split the precoding/combining processing into the analog and digital domains are attractive. A previously proposed hybrid solution employs phase shifters and mixers in the RF precoding/combining stage. It obtains near optimal spectral efficiencies with a reduced number of RF channels. In this paper we propose a different hybrid architecture, which simplifies the hardware at the receiver by replacing the phase shifters with switches. We present a new approach for compressed sensing based channel estimation for the hybrid architectures. Given the channel estimate, we propose a novel algorithm that jointly designs the antenna subsets selected and the baseband combining. Using power consumption calculations and achievable rates, we compare the performance of hybrid combining with antenna switching and phase shifting, showing that antenna selection is preferred in a range of operating conditions.

Original languageEnglish (US)
Title of host publication2015 Information Theory and Applications Workshop, ITA 2015 - Conference Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages90-97
Number of pages8
ISBN (Electronic)9781479971954
DOIs
StatePublished - Oct 27 2015
Externally publishedYes
EventInformation Theory and Applications Workshop, ITA 2015 - San Diego, United States
Duration: Feb 1 2015Feb 6 2015

Other

OtherInformation Theory and Applications Workshop, ITA 2015
CountryUnited States
CitySan Diego
Period2/1/152/6/15

Keywords

  • Baseband
  • MIMO
  • Receivers
  • Yttrium

ASJC Scopus subject areas

  • Computer Science Applications
  • Information Systems

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    Mendez-Rial, R., Rusu, C., Alkhateeb, A., Gonzalez-Prelcic, N., & Heath, R. W. (2015). Channel estimation and hybrid combining for mmWave: Phase shifters or switches? In 2015 Information Theory and Applications Workshop, ITA 2015 - Conference Proceedings (pp. 90-97). [7308971] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ITA.2015.7308971