Smart Antenna Assignment is Essential in Full-Duplex Communications
Full-duplex communications have the potential to almost double the spectral efficiency. To realize such a potentiality, the signal separation at base station's antennas plays an essential role. This article addresses the fundamentals of such separation by proposing a new smart antenna architect...
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| Veröffentlicht in: | IEEE transactions on communications 2021-05, Vol.69 (5), p.3450-3466 |
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| container_title | IEEE transactions on communications |
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| creator | Silva, Jose Mairton B. da Ghauch, Hadi Fodor, Gabor Skoglund, Mikael Fischione, Carlo |
| description | Full-duplex communications have the potential to almost double the spectral efficiency. To realize such a potentiality, the signal separation at base station's antennas plays an essential role. This article addresses the fundamentals of such separation by proposing a new smart antenna architecture that allows every antenna to be either shared or separated between uplink and downlink transmissions. The benefits of such architecture are investigated by an assignment problem to optimally assign antennas, beamforming and power to maximize the weighted sum spectral efficiency. We propose a near-to-optimal solution using block coordinate descent that divides the problem into assignment problems, which are NP-hard, a beamforming and power allocation problems. The optimal solutions for the beamforming and power allocation are established while near-to-optimal solutions to the assignment problems are derived by semidefinite relaxation. Numerical results indicate that the proposed solution is close to the optimum, and it maintains a similar performance for high and low residual self-interference powers. With respect to the usually assumed antenna separation technique and half-duplex transmission, the sum spectral efficiency gains increase with the number of antennas. We conclude that our proposed smart antenna assignment for signal separation is essential to realize the benefits of multiple antenna full-duplex communications. |
| doi_str_mv | 10.1109/TCOMM.2021.3059463 |
| format | Article |
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To realize such a potentiality, the signal separation at base station's antennas plays an essential role. This article addresses the fundamentals of such separation by proposing a new smart antenna architecture that allows every antenna to be either shared or separated between uplink and downlink transmissions. The benefits of such architecture are investigated by an assignment problem to optimally assign antennas, beamforming and power to maximize the weighted sum spectral efficiency. We propose a near-to-optimal solution using block coordinate descent that divides the problem into assignment problems, which are NP-hard, a beamforming and power allocation problems. The optimal solutions for the beamforming and power allocation are established while near-to-optimal solutions to the assignment problems are derived by semidefinite relaxation. Numerical results indicate that the proposed solution is close to the optimum, and it maintains a similar performance for high and low residual self-interference powers. With respect to the usually assumed antenna separation technique and half-duplex transmission, the sum spectral efficiency gains increase with the number of antennas. We conclude that our proposed smart antenna assignment for signal separation is essential to realize the benefits of multiple antenna full-duplex communications.</description><identifier>ISSN: 0090-6778</identifier><identifier>ISSN: 1558-0857</identifier><identifier>EISSN: 1558-0857</identifier><identifier>DOI: 10.1109/TCOMM.2021.3059463</identifier><identifier>CODEN: IECMBT</identifier><language>eng</language><publisher>New York: IEEE</publisher><subject>antenna assignment ; antenna splitting ; Antennas ; Array signal processing ; Beamforming ; beamforming design ; Circulators ; Computer architecture ; Computer Science ; Efficiency ; Electrical Engineering ; Elektro- och systemteknik ; full-duplex ; Full-duplex systems ; hardware impairments ; Mathematics ; Optimization ; power allocation ; Receiving antennas ; semidefinite programming ; Separation ; Spectra ; Spectral efficiency ; Transmitting antennas</subject><ispartof>IEEE transactions on communications, 2021-05, Vol.69 (5), p.3450-3466</ispartof><rights>Copyright The Institute of Electrical and Electronics Engineers, Inc. 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To realize such a potentiality, the signal separation at base station's antennas plays an essential role. This article addresses the fundamentals of such separation by proposing a new smart antenna architecture that allows every antenna to be either shared or separated between uplink and downlink transmissions. The benefits of such architecture are investigated by an assignment problem to optimally assign antennas, beamforming and power to maximize the weighted sum spectral efficiency. We propose a near-to-optimal solution using block coordinate descent that divides the problem into assignment problems, which are NP-hard, a beamforming and power allocation problems. The optimal solutions for the beamforming and power allocation are established while near-to-optimal solutions to the assignment problems are derived by semidefinite relaxation. 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| subjects | antenna assignment antenna splitting Antennas Array signal processing Beamforming beamforming design Circulators Computer architecture Computer Science Efficiency Electrical Engineering Elektro- och systemteknik full-duplex Full-duplex systems hardware impairments Mathematics Optimization power allocation Receiving antennas semidefinite programming Separation Spectra Spectral efficiency Transmitting antennas |
| title | Smart Antenna Assignment is Essential in Full-Duplex Communications |
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