Abstract
In this paper, new radio access scheme that combines Amplify-and-Forward (AF) relaying protocol and non-orthogonal multiple access (NOMA) system is introduced. In particular, different scenarios for fixed power allocation scheme is investigated. In addition, the outage probability of both weak and strong user is derived and provided in closed-form expressions. Such outage is investigated in high SNR scenario and comparison performance between these NOMA scenarios is introduced. Numerical simulations are offered to clarify the outage performance of the considered scheme if varying several parameters in the existing schemes to verify the derived formulas.
Highlights
As one favorable technology in future fifth-generation (5G) wireless networks, nonorthogonal multiple access (NOMA) has been proposed to increase spectral efficiency [1]
By permitting multiple users served in the same time, frequency or code domain, spectral efficiency and user fairness are improved in NOMA compared with orthogonal multiple access (OMA)
One can observe that adjusting the target rates of NOMA users will affect the outage behaviors of considered scheme
Summary
As one favorable technology in future fifth-generation (5G) wireless networks, nonorthogonal multiple access (NOMA) has been proposed to increase spectral efficiency [1]. In [11], only feed back one bit of its channel state information (CSI) to a base station (BS) is considered in term of outage behavior of each NOMA user in downlink NOMA. Motivated by above analysis and especially in [9], this paper presents a fixed power allocation scheme to show outage performance of separated users in the NOMA scheme in case of AF scheme is deployed.
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