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NOMA-enabled multi-beam satellite systems: Joint optimization to overcome offered-requested data mismatches

Authors :
Lei Lei
Symeon Chatzinotas
Bjorn Ottersten
Ana I. Perez-Neira
Anyue Wang
Eva Lagunas
Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions
Source :
UPCommons. Portal del coneixement obert de la UPC, Universitat Politècnica de Catalunya (UPC), BASE-Bielefeld Academic Search Engine, IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, r-CTTC: Repositorio Institucional Producción Científica del Centre Tecnològic de Telecomunicacions de Catalunya (CTTC), Centre Tecnològic de Telecomunicacions de Catalunya (CTTC), r-CTTC. Repositorio Institucional Producción Científica del Centre Tecnològic de Telecomunicacions de Catalunya (CTTC), instname
Publication Year :
2021
Publisher :
Institute of Electrical and Electronics Engineers (IEEE), 2021.

Abstract

Non-Orthogonal Multiple Access (NOMA) has potentials to improve the performance of multi-beam satellite systems. The performance optimization in satellite-NOMA systems can be different from that in terrestrial-NOMA systems, e.g., considering distinctive channel models, performance metrics, power constraints, and limited flexibility in resource management. In this paper, we adopt a metric, Offered Capacity to requested Traffic Ratio (OCTR), to measure the requested-offered data (or rate) mismatch in multi-beam satellite systems. In the considered system, NOMA is applied to mitigate intra-beam interference while precoding is implemented to reduce inter-beam interference. We jointly optimize power, decoding orders, and terminal-timeslot assignment to improve the max-min fairness of OCTR. The problem is inherently difficult due to the presence of combinatorial and non-convex aspects. We first fix the terminal-timeslot assignment, and develop an optimal fast-convergence algorithmic framework based on Perron-Frobenius theory (PF) for the remaining joint power-allocation and decoding-order optimization problem. Under this framework, we propose a heuristic algorithm for the original problem, which iteratively updates the terminal-timeslot assignment and improves the overall OCTR performance. Numerical results verify that max-min OCTR is a suitable metric to address the mismatch issue, and is able to improve the fairness among terminals. In average, the proposed algorithm improves the max-min OCTR by 40.2% over Orthogonal Multiple Access (OMA).<br />Comment: 11 pages, 5 figures

Details

Language :
English
ISSN :
00189545
Database :
OpenAIRE
Journal :
UPCommons. Portal del coneixement obert de la UPC, Universitat Politècnica de Catalunya (UPC), BASE-Bielefeld Academic Search Engine, IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, r-CTTC: Repositorio Institucional Producción Científica del Centre Tecnològic de Telecomunicacions de Catalunya (CTTC), Centre Tecnològic de Telecomunicacions de Catalunya (CTTC), r-CTTC. Repositorio Institucional Producción Científica del Centre Tecnològic de Telecomunicacions de Catalunya (CTTC), instname
Accession number :
edsair.doi.dedup.....8bd7c743f4f034675e17d4692ce73b7a