Switch-based Hybrid Beamforming Transceiver Design for Wideband Communications with Beam Squint
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arXiv
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| Format: | Preprint |
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2022
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| _version_ | 1866913518613168128 |
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| author | Ma, Mengyuan Nguyen, Nhan Thanh Juntti, Markku |
| author_facet | Ma, Mengyuan Nguyen, Nhan Thanh Juntti, Markku |
| contents | Hybrid beamforming (HBF) transceiver architectures based on frequency-independent phase shifters (PS-HBF) are sensitive to the phases and physical directions with limited capability to compensate for the detrimental effects of the beam squint. Motivated by the fact that switches are phase-independent and more power/cost efficient than PSs, we consider the switch-based HBF (SW-HBF) for wideband large-scale multiple-input multiple-output systems in this paper. We first derive a closed-form expression of the beam squint ratio and compare the expected array gains of both SW-HBF and PS-HBF architectures. The results show that SW-HBF is more robust to the beam squint effect. We then focus on the SW-HBF designs to maximize the spectral efficiency (SE) in both single-user and multiuser systems, which are both non-convex mixed-integer problems. For the former, by combining the tabu search (TS) method and projected gradient ascend (PGA), we propose an efficient heuristic PGA-TS algorithm to design analog beamformers while the digital ones admit closed-form solutions. For the latter, we develop a two-step algorithm based on fractional programming and the PGA-TS method. Simulations show that the proposed SW-HBF schemes are efficient and can outperform PS-based HBF architectures in terms of both SE and energy efficiency in terahertz communication systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2210_06890 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Switch-based Hybrid Beamforming Transceiver Design for Wideband Communications with Beam Squint Ma, Mengyuan Nguyen, Nhan Thanh Juntti, Markku Signal Processing Hybrid beamforming (HBF) transceiver architectures based on frequency-independent phase shifters (PS-HBF) are sensitive to the phases and physical directions with limited capability to compensate for the detrimental effects of the beam squint. Motivated by the fact that switches are phase-independent and more power/cost efficient than PSs, we consider the switch-based HBF (SW-HBF) for wideband large-scale multiple-input multiple-output systems in this paper. We first derive a closed-form expression of the beam squint ratio and compare the expected array gains of both SW-HBF and PS-HBF architectures. The results show that SW-HBF is more robust to the beam squint effect. We then focus on the SW-HBF designs to maximize the spectral efficiency (SE) in both single-user and multiuser systems, which are both non-convex mixed-integer problems. For the former, by combining the tabu search (TS) method and projected gradient ascend (PGA), we propose an efficient heuristic PGA-TS algorithm to design analog beamformers while the digital ones admit closed-form solutions. For the latter, we develop a two-step algorithm based on fractional programming and the PGA-TS method. Simulations show that the proposed SW-HBF schemes are efficient and can outperform PS-based HBF architectures in terms of both SE and energy efficiency in terahertz communication systems. |
| title | Switch-based Hybrid Beamforming Transceiver Design for Wideband Communications with Beam Squint |
| topic | Signal Processing |
| url | https://arxiv.org/abs/2210.06890 |