Joint User Pairing and Power Allocation for NOMA-Based GEO and LEO Satellite Network
| Autor: | Kang An, Guangxia Li, Jian Cheng, Dongming Bian, Jing Hu, Ruixing Ge |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Multi-layer satellite networks
Optimization problem General Computer Science Computer science Iterative method Distributed computing General Engineering Throughput user pairing power allocation Subcarrier non-orthogonal multiple access TK1-9971 Pairing Telecommunications link Geostationary orbit General Materials Science Electrical engineering. Electronics. Nuclear engineering 5G |
| Zdroj: | IEEE Access, Vol 9, Pp 93255-93266 (2021) |
| ISSN: | 2169-3536 |
| Popis: | Multi-layer satellite networks (MLSNs) is of great potential for the integrated 5G networks to provide diversified services. However, MLSNs confront frequency interference coordination problem between satellite systems in different orbits. This paper investigates a joint user pairing and power allocation scheme in a non-orthogonal multiple access (NOMA)-based geostationary earth orbit (GEO) and low earth orbit (LEO) satellite network. Specifically, a novel NOMA framework with two uplink receivers, i.e. the GEO and LEO satellites is established where the NOMA groups are formed considering the subcarrier assignment of ground users. To maximize the system capacity, an optimization problem is then introduced subject to the decoding threshold and power consumption. Since the formulated problem is non-convex and mathematically intractable, we decompose it into user pairing and power allocation schemes. In the user pairing scheme, virtual GEO users are generated to transform the multi-user pairing problem into a matching problem and a max-min pairing strategy is adopted to ensure the fairness among NOMA groups. In the power allocation scheme, the non-convex problem is transformed into multiple convex subproblems and solved by iterative algorithm. Simulation results validate the effectiveness and superiority of the proposed schemes when compared with several existing schemes. |
| Databáze: | OpenAIRE |
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