NOMA-Based Integrated Satellite Terrestrial Networks With Relay Selection and Imperfect SIC

Haifeng Shuai,Kefeng Guo,Shibing Zhu,Kang An

doi:10.1109/access.2021.3103944

Abstract

Integrated satellite terrestrial networks (ISTNs) are becoming a hot research topic in recent years due to the capabilities of high quality, high throughput, and seamless coverage. However, the limited spectrum resources are difficult to meet the needs of a large number of users in ISTNs, and the obstacles and shadowing will seriously affect the communication quality of networks. In this regard, cooperative transmission of non-orthogonal multiple access (NOMA)-assisted ISTNs with the help of multiple terrestrial relays are established to enhance the spectrum efficiency and enlarge the transmission coverage. In this paper, we investigate the performance of NOMA-based ISTNs with relay selection and imperfect successive interference cancellation (SIC). Particularly, the partial relay selection (PRS) scheme is used in the considered system to reach the balance of system performance and complexity. Owing to practical constraints, the imperfect SIC is analyzed for the networks. Based on the PRS scheme and imperfect SIC, we obtain the closed-form expressions for the outage probability (OP) and ergodic capacity (EC) of the considered networks. Besides, to get further insights of key system parameters, the asymptotic analysis for the OP is also derived. Finally, numerical and simulation results are presented to validate the correctness of our analytical results.

Highlights

R ECENT years, satellite communication (SatCom) has been the key part of fifth-generation (5G) networks and beyond 5G (B5G) networks due to its inherent characteristics such as high throughput, wide coverage, high reliability, and disregarding geographic boundaries for propagation, which will be an excellent complement to the current terrestrial communications [1]–[4]
The outage probability (OP) of the considered Integrated satellite terrestrial networks (ISTNs) decreases with the channel conditions deteriorating or experiencing worse imperfect successive interference cancellation (SIC)
The MC simulations are in line with the analytical results, the analytical analysis is in accordance with the trend of asymptotic analysis under a high SNR regime, which proves the accurateness and effectiveness of our analytical and asymptotic research

Summary

Introduction

R ECENT years, satellite communication (SatCom) has been the key part of fifth-generation (5G) networks and beyond 5G (B5G) networks due to its inherent characteristics such as high throughput, wide coverage, high reliability, and disregarding geographic boundaries for propagation, which will be an excellent complement to the current terrestrial communications [1]–[4]. Due to the obstacles and shadowing between the satellite and terrestrial users, the transmission quality of the direct link of the ISTNs is low or even interrupted [8]–[10]. In this regard, integrated satellite terrestrial relay networks (ISTRNs) are established to overcome this problem, which can utilize the terrestrial relay stations to receive and forward satellite signals to terrestrial users [11], [12]. NOMA scheme is recognized as one of the vital core technologies for massive user access and ultra-high capacity requirements in the future wireless communication networks

Objectives

Results

Conclusion