Abstract
We study a hybrid satellite-terrestrial cognitive network (HSTCN) relying on non-orthogonal multiple access (NOMA) interconnecting a satellite and multiple terrestrial nodes. In this scenario, the long distance communication is achieved by the satellite equipped multiple antennas to send information to a multi-antenna destinations through the base station acting as relay. The secure performance is necessary to study by exploiting the appearance of an eavesdropper attempting to intercept the transmissions from relay to destinations. We explore situation of hardware imperfections in secondary network and deign of multiple antennas need be investigated in term of the physical-layer security by adopting the decode-and-forward (DF) relay strategy. Specifically, we guarantee coverage area by enabling relaying scheme and keep outage probability (OP) performance satisfying required data rates. Moreover, suppose that only the main channels' state information is known while the wiretap channels' state information is unavailable due to the passive eavesdropper, we analyze the secrecy performance in term of intercept probability (IP) of the HSTCN by driving the closed-form expressions of such performance metric. Finally, the presented simulation results show that: 1) The outage behaviors of NOMA-based HSTCN network does not depend on transmit signal to noise ratio (SNR) at source at high SNR; 2) Numerical results show that the such system using higher number of transceiver antennas generally outperform the system with less antennas in terms of OP and IP and reasonable selection of parameters is necessary to remain the secrecy performance of such systems; and 3) By allocating different power levels to tow users, the second user has better secure behavior compared with the first user regardless of other set of satellite links or the number of antennas, which means that the superiority of the second user compared with user the first user in terms of OP and IP are same.
Highlights
To provide advances such as navigation assistance, ubiquitous large coverage and fast services in disaster areas, land mobile satellite (LMS) communication systems benefit to deployment of future wireless networks [1]
We present analytical expressions to indicate two important performance metrics such as the outage probability (OP) and intercept probability of the such system, which is applicable to evaluate reliable and secure transmission of such non-orthogonal multiple access (NOMA)-hybrid satellite-terrestrial cognitive networks (HSTCNs) which benefits from design of multiple-antenna
We have investigated the effects of hardware impairments on the reliability and security for NOMA-HSTCN systems by enabling multiple antennas design
Summary
To provide advances such as navigation assistance, ubiquitous large coverage and fast services in disaster areas, land mobile satellite (LMS) communication systems benefit to deployment of future wireless networks [1]. By considering other users as interference the user with the best channel condition can be decoded firstly In [22], the authors studied the relaying scheme employed in the secondary network of the proposed CR-NOMA and the relay can be harvest energy from the secondary transmitter to serve signal forwarding to distant secondary users They considered the complex model of wireless powered CR-NOMA in terms of outage behavior and throughput performance as awareness on imperfect SIC at the receiver. The authors adopted a stochastic model for the channel state information uncertainty and proposed a secure and robust beamforming framework to minimize the transmit power, while satisfying a range of outage (probabilistic) constraints at the satellite user and the terrestrial user They only considered the secure transmission for HSTRN.
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