不同解码方案下的星地融合网络混合多址接入性能分析

Performance Analysis of Hybrid Multiple Access in Integrated Satellite-Terrestrial Networks with Different Decoding Schemes

该文针对地面中继辅助的星地融合网络(ISTNs),分析了卫星采用不同解码方案时系统性能的差异。首先,提出一种新颖的用户配对方案,通过位置信息将卫星波束覆盖范围内的多个用户分为若干个组。接着,为了提高传输可靠性以及频谱利用率,用户采用混合多址接入技术与卫星进行通信。进一步,在考虑用户-地面中继链路服从Nakagami-m分布,地面中继-卫星链路服从相关阴影莱斯分布的情况下,分别推导出基于连续干扰消除(SIC)和联合解码(JD)两种解码方案的系统中断概率和吞吐量的闭合表达式。最后,计算机仿真验证了理论分析的正确性和所提方案相比正交多址(OMA)方案的优越性,并揭示了JD解码技术在ISTNs中的可行性。

The performance differences are investigated for terrestrial relay-assisted Integrated SatelliteTerrestrial Networks(ISTNs)when satellite employs different decoding schemes.Initially,a multi-user pairing scheme leveraging location information is proposed,and multiple users within the coverage area of satellite beam are divided into several groups.To improve transmission reliability and spectral efficiency,users communicate with satellite employing hybrid multiple access.Additionally,assuming that user-terrestrial relay links obey Nakagami-m fading while terrestrial relay-satellite link follows correlated shadowed-Rician fading,the closed-form expressions of outage probability and throughput are derived when the satellite adopts Successive Interference Cancellation(SIC)and Joint Decoding(JD)respectively.Finally,computer simulations validate the correctness of the theoretical analysis and the superiority of the proposed scheme compared with Orthogonal Multiple Access(OMA),and reveal that JD decoding scheme is feasible in the ISTNs.