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Jointly optimized beamforming and power allocation for full-duplex cell-free NOMA in space-ground integrated networks

Jointly optimized beamforming and power allocation for full-duplex cell-free NOMA in space-ground integrated networks
Jointly optimized beamforming and power allocation for full-duplex cell-free NOMA in space-ground integrated networks
Space-ground integrated networks (SGINs) have attracted substantial research interests due to their wide area coverage capability, where spectrum sharing is employed between the satellite and terrestrial networks for improving the spectral efficiency (SE). We further improve the SE by conceiving a cellfree system in SGINs, where the full-duplex (FD) multi-antenna APs simultaneously provide downlink and uplink services at the same time and within the same frequency band. Furthermore, power domain (PD) non-orthogonal multiple access (NOMA) is employed as the multiple access (MA) technique in the cell-free system. To achieve a performance enhancement, the sum-rate maximization problem is formulated for jointly optimizing the power allocation factors (PAFs) of the NOMA downlink (DL), the uplink transmit power, and both the beamformer of the satellite and of the APs. Successive convex approximation (SCA) and semi-definite programming (SDP) are adopted to transform the resultant non-convex problem into an equivalent convex one. Our simulation results reveal that 1) our proposed system outperforms the well-known approaches (i.e., frequency division duplex (FDD) and small cell systems) in terms of its SE; 2) our proposed optimization algorithm significantly improves the networking performance; 3) the conceived SIC order design outperforms the fixed-order design at the same complexity.
Array signal processing, Beamforming design, Downlink, Interference, NOMA, Optimization, Resource management, SAGINs, Satellites, cell-free, full-duplex, multiple-antenna NOMA, power allocation
0090-6778
2816-2830
Gao, Qiling
753fe35e-5fb6-4f4a-983f-19c325e05085
Jia, Min
3567decc-ad49-455a-8226-ad633cb82e67
Guo, Qing
a1dfdf0a-91a5-4cd5-811e-b379917f0707
Gu, Xuemai
983c4062-4864-47ac-8ab9-05a53b7e2bb0
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Gao, Qiling
753fe35e-5fb6-4f4a-983f-19c325e05085
Jia, Min
3567decc-ad49-455a-8226-ad633cb82e67
Guo, Qing
a1dfdf0a-91a5-4cd5-811e-b379917f0707
Gu, Xuemai
983c4062-4864-47ac-8ab9-05a53b7e2bb0
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1

Gao, Qiling, Jia, Min, Guo, Qing, Gu, Xuemai and Hanzo, Lajos (2023) Jointly optimized beamforming and power allocation for full-duplex cell-free NOMA in space-ground integrated networks. IEEE Transactions on Communications, 71 (5), 2816-2830. (doi:10.1109/TCOMM.2023.3251342).

Record type: Article

Abstract

Space-ground integrated networks (SGINs) have attracted substantial research interests due to their wide area coverage capability, where spectrum sharing is employed between the satellite and terrestrial networks for improving the spectral efficiency (SE). We further improve the SE by conceiving a cellfree system in SGINs, where the full-duplex (FD) multi-antenna APs simultaneously provide downlink and uplink services at the same time and within the same frequency band. Furthermore, power domain (PD) non-orthogonal multiple access (NOMA) is employed as the multiple access (MA) technique in the cell-free system. To achieve a performance enhancement, the sum-rate maximization problem is formulated for jointly optimizing the power allocation factors (PAFs) of the NOMA downlink (DL), the uplink transmit power, and both the beamformer of the satellite and of the APs. Successive convex approximation (SCA) and semi-definite programming (SDP) are adopted to transform the resultant non-convex problem into an equivalent convex one. Our simulation results reveal that 1) our proposed system outperforms the well-known approaches (i.e., frequency division duplex (FDD) and small cell systems) in terms of its SE; 2) our proposed optimization algorithm significantly improves the networking performance; 3) the conceived SIC order design outperforms the fixed-order design at the same complexity.

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Accepted/In Press date: 19 February 2023
e-pub ahead of print date: 2 March 2023
Published date: 1 May 2023
Additional Information: Funding Information: The work of Min Jia was supported by National Natural Science Foundation of China No. 62231012, National Key Research and Development Program of China under Grant 2021YFB2900500, and Natural Science Foundation for Outstanding Young Scholars of Heilongjiang Province under Grant YQ2020F001. The work of Lajos Hanzo would like to acknowledge the financial support of the Engineering and Physical Sciences Research Council projects EP/W016605/1 and EP/X01228X/1 as well as of the European Research Council's Advanced Fellow Grant QuantCom (Grant No. 789028). Publisher Copyright: © 1972-2012 IEEE.
Keywords: Array signal processing, Beamforming design, Downlink, Interference, NOMA, Optimization, Resource management, SAGINs, Satellites, cell-free, full-duplex, multiple-antenna NOMA, power allocation

Identifiers

Local EPrints ID: 476808
URI: http://eprints.soton.ac.uk/id/eprint/476808
ISSN: 0090-6778
PURE UUID: 03b71dac-4123-4b89-91e2-b27f96bde491
ORCID for Lajos Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

Catalogue record

Date deposited: 16 May 2023 16:58
Last modified: 18 Mar 2024 02:36

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Contributors

Author: Qiling Gao
Author: Min Jia
Author: Qing Guo
Author: Xuemai Gu
Author: Lajos Hanzo ORCID iD

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