Abstract
In this paper, we investigate the effects of residual hardware impairments (RHIs), channels estimation errors (CEEs) and imperfect successive interference cancellation (ipSIC) on the cooperative non-orthogonal multiple access (NOMA) system over Nakagami-m channels, where the amplify-and-forward (AF) relay can harvest energy from the source. The exact expressions for outage probability and ergodic sum rate are derived in closed-form. In addition, the asymptotic outage analyses in the high signal-to-noise (SNR) regime are carried out. The results show that the outage probability exists an error floor due to the existence of CEEs and compared with RHIs, CEEs have a more serious impact on the system outage performance. The close simulation results of Monte Carlo verify the accuracy of our theoretical derivation. Finally, the performance of energy efficiency is examined with RHIs, CEEs and ipSIC.
Highlights
With the development of communication technology, the fifth generation (5G) mobile communication network has gradually entered the field of vision
In [19], the system performances of both single-input single-output (SISO) and multiple-input single-output (MISO) Simultaneous wireless information and power transfer (SWIPT) nonorthogonal multiple access (NOMA) systems were studied and the results showed that the performance of SWIPT NOMA is better than that of NOMA, which indicated that SWIPT can provide higher gain for the system
The results show that the impact of channels estimation errors (CEEs) on system performance is more serious than that of residual hardware impairments (RHIs) or imperfect successive interference cancellation (ipSIC)
Summary
With the development of communication technology, the fifth generation (5G) mobile communication network has gradually entered the field of vision. In [12], the authors studied the bit error rate performance of NOMA systems under the conditions of ideal and non-ideal SIC, and presented a more realistic method than the pSIC. Considering TS protocol, authors in [20] derived exact analytical expressions for the outage probability and network throughput of cooperative relaying systems. The residual hardware impairments have significant effects on the system performance, authors in [26] studied the system effects of multiplerelay AF network in the presence of RHIs and derived the closed-form expression of the outage probability. The outage and the expected spectral efficiency performances of the cooperative DF systems in the presence of RHIs and CEEs were studied in [34].
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