Journal
IEEE WIRELESS COMMUNICATIONS LETTERS
Volume 9, Issue 2, Pages 219-222Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LWC.2019.2948862
Keywords
Array signal processing; Phase shifters; Optimization; Interference; Signal to noise ratio; Iron; Downlink; Millimeter-wave communication; hybrid beamforming; discrete-phase shifter; inexact MM
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Funding
- National Natural Science Foundation of China [61531009]
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This letter considers hybrid analog-digital beamforming with discrete-phase shifters for multiuser multiple-input and single-output (MISO) downlink transmission in millimeter-wave (mm-wave) channels. A max-min signal-to-interference-plus-noise ratio (SINR) fairness problem is formulated. Owing to the discrete-phase constraints, this problem is a mixed integer nonlinear program (MINP) and is generally NP-hard. To handle it, an alternating optimization approach is employed. Specifically, for the digital beamformer, zero-forcing (ZF) beamforming is utilized. For the discrete-phase analog beamformer, we first derive an equivalent continuous reformulation and then solve it by leveraging an inexact majorization-minimization (MM) algorithm, which is built upon the first-order method and MM update. Simulation results show that the proposed design can almost achieve the optimal performance of the exhaustive search method, and can approach the optimal full-digital performance with increasing resolution of the discrete-phase shifters.
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