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

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. INDEX TERMS Integrated satellite terrestrial networks (ISTNs), non-orthogonal multiple access (NO-MA), relay selection, successive interference cancellation (SIC).

Performance of Hybrid Satellite-UAV NOMA Systems

“…performance. We compare the OP performance for two different shadowing scenarios, i.e., FHS, and infrequent light shadowing (ILS) whose channel parameters are given in Table II [24]. The results show that the OPs of both users under FHS scenario are slightly higher than the OPs of ILS due to the impact of communication conditions between satellite and UAV.…”

“…The authors in [5] have considered the fairness issue in a NOMA-based HSTN system, where the terrestrial network acts as a cooperative relay. In [24], the NOMAbased integrated satellite-terrestrial relay networks (ISTNs) with multiple terrestrial relays was proposed, where a satellite communicates with two terrestrial users with the help of a selected relay out of multiple terrestrial relays under imperfect SIC. The performance of energy-harvesting terrestrial relaybased HSTNs network is investigated, where both amplifyand-forward (AF) [25] and decode-and-forward (DF) relay is powered from the satellite signals under NOMA transmission [2].…”

Reliability of Spectrum-Efficient Mixed Satellite-Underwater Systems

“…The simulation results are performed over 10 6 iterations by implementing the Monte-Carlo simulation. The link between S and R is subject to Shadowed-Rician fading with variable shadowing levels where Table 1 [33] provides the channel parameters. The simulation parameters employed in this section are summarized in Table 2.…”

Ergodic Capacity of NOMA-Based Multi-Antenna LMS Systems with Imperfect Limitations

“…In the process of signal detection, the NOMA scheme uses successive interference cancellation (SIC) technology to obtain the target signal of each sensor user in the superimposed signal [ 28 , 29 ]. However, due to the limitations of receiver performance, perfect SIC is difficult to achieve in reality [ 30 , 31 ]. The imperfect SIC situation in the NOMA-based SatCom was analyzed in [ 32 ], and the analytical expressions for OP of each sensor user and the corresponding asymptotic OP were derived.…”