Abstract
In this paper, we consider a two-user downlink full-duplex (FD) non-orthogonal multiple access (NOMA) relay system where the FD relay uses an energy harvesting (EH) technique to assist the communication between the base station and far user over flat, independent and non-identically Rayleigh fading channels. Importantly, since the relay operates in FD mode, we take into account the effect of the interference caused by relay on the near user. Considering this EH-FD-NOMA relay system, we derive the exact mathematical expressions of the outage probabilities and ergodic capacities of near and far users. Monte–Carlo simulations verify the accuracy of our analytical method. Numerical results provided in this paper allow system designers to clearly see not only the impacts of the power distribution factor and the self-interference cancellation capacity of the relay but also the influence of the strength of inter-user interference at the near user on the outage performances and ergodic capacities of both users.
Highlights
The rapid development of mobile information systems and the Internet of Things (IoT)sets new requirements and challenges for the fifth-generation (5G) wireless communications [1].The performance requirements that a 5G radio system needs to achieve compared with a 4G radio system are very high: spectrum efficiency increases from 5 to 15 times; the number of connections is very large numbers, can be dozens of times higher, at least 106 connections per km2 with small latency and can support various radio services [2].the non-orthogonal multiple access (NOMA) technique was proposed to meet the demand for increasing user connections in 5G wireless systems
The non-orthogonal multiple access (NOMA) technique was proposed to meet the demand for increasing user connections in 5G wireless systems
When increasing α, OPxB does not decrease as monotonically as OPxA but tends to increase when α is larger than a specified value
Summary
The rapid development of mobile information systems and the Internet of Things (IoT). Considering the cooperative NOMA system using a dedicated FD relay with multiple antennas, Huang et al [26] formulated and solved the problem of maximizing energy efficiency with the guarantee of quality-of-service (QoS) requirements for two users. Both [25] and [26] solved the energy efficiency problem under the constraints of the performance systems but mainly built optimization problems under the constraints of several system parameters without giving mathematical analysis.
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