Abstract
This paper considers hybrid beamforming consisting of analog beamforming (ABF) coupled with digital baseband beamforming (DBF) which is designed for multi-user (MU) multiple input multiple output (MIMO) millimeter-wave (mmWave) communications. ABF uses a limited number of radio frequency (RF) chains and finite-resolution phase-shifters to alleviate the power consumption at the base station (BS), while DBF uses either zero-forcing beamforming (ZFB) or regularized zero forcing beamforming (RZFB) to restrain MU interference. The joint design of ABF and DBF constitutes a computationally challenging mixed discrete continuous optimization problem. The paper develops efficient algorithms for its solution, which iterate scalable-complex expressions. Furthermore, we conceive a new class of MU RZFB for attaining higher rates. Simulations are provided to demonstrate the viability of the proposed algorithms and the advantages of the conceived RZFB.
Original language | English (US) |
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Pages (from-to) | 3280-3295 |
Number of pages | 16 |
Journal | IEEE Transactions on Wireless Communications |
Volume | 22 |
Issue number | 5 |
DOIs | |
State | Published - May 1 2023 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Applied Mathematics
- Electrical and Electronic Engineering
- Computer Science Applications
Keywords
- Brunn-Minkowski geometry
- Multi-user multiple-input-multiple-output millimeter-wave communications
- analog beamforming with b-bit resolution
- hybrid beamforming
- mixed discrete continuous optimization
- regularized zero-forcing beamforming
- scalable complexity
- zero-forcing beamforming