Hybrid Beamforming for Multi-User Millimeter-Wave Networks

Ali Arshad Nasir, Hoang Duong Tuan, Trung Q. Duong, H. Vincent Poor, Lajos Hanzo

Research output: Contribution to journalArticlepeer-review

Abstract

This paper considers hybrid beamforming by combining an analog beamformer with a new regularized zero forcing baseband one, for multi-user millimeter-wave networks under a limited number of radio frequency (RF) chains. Three popular scenarios are examined: i) the number of users is up to the number of RF chains in a single-cell network, ii) the number of users is up to twice the number of RF chains in a single-cell network, and iii) the number of users is up to twice the number of RF chains in each cell of a two-cell network. In the second and third scenarios, we group the users into two categories of cell-center users as well as cell-edge users and serve them in two different time fractions. In the third scenario, we propose to suppress the inter-cell interference by serving the cell-center and cell-edge users in alternate fractional-time slots. In all the three scenarios, we determine the optimal power allocation maximizing the users' minimum rate. Finally, low-complexity path-following algorithms having rapid convergence are developed for the computation of the optimal power. Our simulation results show that the proposed algorithms achieve a clear performance gain over the existing benchmarkers.

Original languageEnglish (US)
Article number8957245
Pages (from-to)2943-2956
Number of pages14
JournalIEEE Transactions on Vehicular Technology
Volume69
Issue number3
DOIs
StatePublished - Mar 2020

All Science Journal Classification (ASJC) codes

  • Automotive Engineering
  • Aerospace Engineering
  • Electrical and Electronic Engineering
  • Applied Mathematics

Keywords

  • Millimeter-wave communications
  • analog beamforming
  • baseband beamforming
  • hybrid beamforming
  • nonconvex optimization algorithms
  • regularized zero-forcing beamforming

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