Abstract
In this paper, we propose a novel max-weight secure link selection (MWSLS) scheme to enhance physical layer security of decode-and-forward (DF) buffer-aided relay networks. The MWSLS scheme can select the link with the largest weight among all secure and available source-to-relay and relayto-destination links. By modeling the dynamic buffer state transitions as a Markov chain, we derive the closed-form expressions of the secrecy outage probability, the secrecy diversity gain, the average secrecy throughput and the end to end delay, which provide a comprehensive and effective way to evaluate the impacts of different parameters on the secrecy performance. The results of this paper reveal that: 1) For the case with small buffer sizes, a significant enhancement on the secrecy outage performance can be observed compared with the popular max-link secure link selection (MLSLS) scheme. 2) When L ≥ 3, the secrecy diversity gain of the system can achieve 2M, while the MLSLS scheme achieves the same secrecy diversity gain only when L → ∞ (where M denotes the number of relays and L is the buffer size). 3) The MWSLS scheme outperforms the MLSLS scheme in terms of the average secrecy throughput and the end to end delay in the low signal-to-noise ratio (SNR) regime, and obtain the same performance as the latter in the high SNR regime.
Highlights
Relay technique is seen as a promising way to extend the coverage of wireless networks and provides a variety of performance enhancements, which has attracted enormous research interest [1]–[3]
SIMULATION ANALYSIS we present comparison simulation results for the secrecy performance of the MWSLS scheme and the MLSLS scheme to verify the theoretical analysis in the previous sections
This paper proposes a novel MWSLS scheme to enhance physical layer security of the considered system by giving higher priority to the buffer status to avoid the event of buffers to be full or empty occurring
Summary
Relay technique is seen as a promising way to extend the coverage of wireless networks and provides a variety of performance enhancements, which has attracted enormous research interest [1]–[3]. In [24], the system model of [23] was extended to a multipleinput multiple-output (MIMO) scenario, and a buffer-aided joint transmit antenna and relay selection (JTARS) scheme based on the main channel was proposed to enhance the secrecy performance of the considered system. The buffer of the corresponding relay with good link quality tends to be full or empty which may result in the decrease of the available links Motivated by these observations, we propose a novel maxweight secure link selection (MWSLS) scheme to improve the secrecy performance of the dual-hop DF buffer-aided relay networks. The main contributions of this paper are summarized as follows: 1) We propose a novel secure link selection scheme to enhance physical layer security of DF buffer-aided relay networks which considers the buffer status as the dominant selection metric rather than the link quality considered by most existing literatures. The cumulative distribution function (CDF) and the probability density function (PDF) of the random variable γ are denoted as Fγ (·) and fγ (·) respectively
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