Abstract
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.
Highlights
Future 5G communication networks are envisioned to meet the requirement of higher throughput, lower latency and massive devices connection
Motivated by the explosive growth of various services, high throughput satellite (HTS) and low earth orbit (LEO) satellite constellations become the future directions of satellite communication networks in 5G era [3], [4]
This paper investigates a joint user pairing and power allocation scheme in a non-orthogonal multiple access (NOMA)-based geostationary earth orbit (GEO) and LEO satellite network
Summary
Future 5G communication networks are envisioned to meet the requirement of higher throughput, lower latency and massive devices connection. Motivated by the explosive growth of various services, high throughput satellite (HTS) and low earth orbit (LEO) satellite constellations become the future directions of satellite communication networks in 5G era [3], [4]. The associate editor coordinating the review of this manuscript and approving it for publication was Irfan Ahmed. Such as Via-sat and EchoStar are capable of providing total throughput exceeding 200Gbit/s which enable the high throughput requirement [6]. The latitude of 600km, Starlink satellites can provide round trip service within tens of milliseconds, even lower than the terrestrial networks in remote areas [8]
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