Abstract
Wireless backhaul is a cost-effective and flexible alternative to wired backhaul, yet it suffers from unreliability. This paper studies the secrecy performance of a relay network with such unreliable wireless backhaul. Bernoulli process is adopted to model the wireless backhaul reliability. In the network, a relay employing time-switching-based radio frequency harvesting technique aids in forwarding the signal from the best transmitter. An eavesdropper, which is able to wiretap signals from both the transmitter and the relay, uses selection combining to maximize its received signal-to-noise ratio. Analytical expressions for secrecy outage probability, ergodic secrecy rate and non-zero achievable secrecy rate are derived, which can reveal the effect of the number of transmitters and backhaul reliability on the system performance. Furthermore, for the first time the impact of energy harvesting time fraction upon secrecy performances under unreliable backhaul is presented.
Highlights
A high dense network is envisaged in the near future where multiple backhaul connections have to be provided
We investigate the impact of unreliable backhaul on the secrecy performance of energy harvesting (EH) relay networks with transmitter selection
We provide analytical expressions to evaluate the performances of secrecy outage probability, non-zero achievable secrecy rate and ergodic secrecy rate
Summary
A high dense network is envisaged in the near future where multiple backhaul connections have to be provided. These research studies do not investigate the effect of the unreliability of wireless backhaul links on the system performance. Related research in [31] and [32] is extended by considering an energy harvesting relay to enhance coverage and PLS to keep information confidential from an eavesdropper. In [3], the secrecy performance of finite-sized cooperative single-carrier systems with unreliable backhaul connections is investigated. Different from all the aforementioned work, in this paper, we consider unreliable backhaul in EH relay networks where the terminals are under realistic constraints that their batteries are limited. We investigate the impact of unreliable backhaul on the secrecy performance of EH relay networks with transmitter selection. We investigate the effect of the number of transmitters, EH time-fraction ratio, and wireless backhaul reliability on the secrecy performance is investigated. For a random variable X, EX [·] denotes expectation or mean of X, FX (·) denotes its cumulative distribution function (CDF) and fX (·) denotes the corresponding probability density function (PDF). (x)+ max(0, x), and max (·) and min (·) denote the maximum and minimum of their arguments, respectively. λXY denotes inverse of the average SNR of the arbitrary link X − Y
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