Sum-rate maximization of SCMA in multi-gateway satellite communication with on-board processing

IF 2 4区计算机科学 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

Physical Communication Pub Date : 2025-01-20 DOI:10.1016/j.phycom.2025.102613

Yuan Gao , Yuming Zhang , Yanliang Jin , Da-Kui Wu , Wenrui Yang

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引用次数: 0

Abstract

Satellite communication is anticipated to play a crucial role in 6G networks by providing widespread coverage. Given the limited spectrum and the extensive connectivity requirements of satellite communication, Sparse Code Multiple Access (SCMA) compared to orthogonal multiple access techniques such as Orthogonal Frequency Division Multiplexing (OFDM), allows more users to be accommodated within the same frequency resources. Although SCMA is a promising access technology that has been extensively studied in terrestrial communication but has seen limited application in satellite systems, particularly in multi-gateway satellite communication systems. This is due to the more complex interference management required in multi-gateway satellite systems, which includes both intra-gateway and inter-gateway interference. This paper focuses on the sum-rate optimization of a multi-gateway satellite communication system utilizing SCMA, comparing it with OFDM and Power Domain Non-Orthogonal Multiple Access (PD-NOMA) schemes. Specifically, we propose a phased optimization strategy that integrates SCMA with satellite on-board processing(OBP). Additionally, we examine the effect of imperfect Channel State Information at the Transmitter (CSIT) on the system’s sum-rate when gateways cannot acquire perfect CSIT. The simulation results demonstrate that the SCMA-based multi-gateway scheme can accommodate more users compared to OFDM but also achieves a higher system sum-rate compared to OFDM and PD-NOMA. These findings highlight the potential of SCMA in multi-gateway satellite communication systems. As the optimization variables are progressively refined, the system’s sum-rate improves, demonstrating the value of these variables, particularly when satellite OBP is utilized.

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来源期刊

Physical Communication ENGINEERING, ELECTRICAL & ELECTRONICTELECO-TELECOMMUNICATIONS

CiteScore

5.00

自引率

9.10%

发文量

212

审稿时长

55 days

期刊介绍： PHYCOM: Physical Communication is an international and archival journal providing complete coverage of all topics of interest to those involved in all aspects of physical layer communications. Theoretical research contributions presenting new techniques, concepts or analyses, applied contributions reporting on experiences and experiments, and tutorials are published. Topics of interest include but are not limited to: Physical layer issues of Wireless Local Area Networks, WiMAX, Wireless Mesh Networks, Sensor and Ad Hoc Networks, PCS Systems; Radio access protocols and algorithms for the physical layer; Spread Spectrum Communications; Channel Modeling; Detection and Estimation; Modulation and Coding; Multiplexing and Carrier Techniques; Broadband Wireless Communications; Wireless Personal Communications; Multi-user Detection; Signal Separation and Interference rejection: Multimedia Communications over Wireless; DSP Applications to Wireless Systems; Experimental and Prototype Results; Multiple Access Techniques; Space-time Processing; Synchronization Techniques; Error Control Techniques; Cryptography; Software Radios; Tracking; Resource Allocation and Inference Management; Multi-rate and Multi-carrier Communications; Cross layer Design and Optimization; Propagation and Channel Characterization; OFDM Systems; MIMO Systems; Ultra-Wideband Communications; Cognitive Radio System Architectures; Platforms and Hardware Implementations for the Support of Cognitive, Radio Systems; Cognitive Radio Resource Management and Dynamic Spectrum Sharing.