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Lecture notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering

Secrecy Performance Analysis of SWIPT System Based on OFDM Assisted Interference

Mei Qin, Weidang Lu, Hong Peng, Zhijiang Xu

Published Jan 1, 2018• 1 citation
Publisher
DOI
10.1007/978-3-030-00557-3_39

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A multi-input multi-output (MIMO) orthogonal frequency-division multiplexing (OFDM) network in the presence of a passive eavesdropper is considered. The deployment of radio frequency power transfer at the receiver and the use of hybrid artificial noise at the transmitter are simultaneously taken into account. At the legal receiver, the cyclic prefix of each OFDM block is used for the purpose of harvesting energy. In parallel, the power-splitting SWIPT technique is additionally used. We then propose a trade-off problem to maximize the secrecy rate of the network while keeping the harvested energy above a given threshold. Throughout the numerical results, the performance of our proposed secure scheme is evaluated.
We propose a new artificial-noise aided hybrid time-switching/power-splitting scheme for orthogonal frequency-division multiplexing (OFDM) systems to securely transmit data and transfer energy to a legitimate receiving node. In our proposed scheme, the cyclic prefix has two more benefits in addition to the cancellation of the inter-symbol interference between the OFDM blocks. First, it enables the legitimate transmitter to send artificial-noise (AN) vectors in a way such that the interference can be canceled at the legitimate receiver prior to information decoding. Second, its power is used to energize the legitimate receiver. We optimize the cyclic prefix length, the time-switching and power-splitting parameters, and the power allocation ratio between the data and AN signals at the legitimate transmitter to maximize the average secrecy rate subject to a constraint on the average energy transfer rate at the legitimate receiver. Numerical results demonstrate that our proposed scheme can achieve up to 23% average secrecy rate gain relative to a pure power-splitting scheme.
The concept of secrecy outage probability is a fundamental aspect used to study the performance of secrecy in wireless communication networks. While this metric constitutes the key element of secrecy performance evaluation, a more advanced approach involves scrutinizing the eavesdropper's capacity to decode the information. The issue of secrecy becomes critical in our proposed system model for cognitive radio network (CRN) featuring simultaneous wireless information and power transfer (SWIPT). In this context, security concerns arise related to spectrum sharing in CRNs, with the energy harvester in SWIPT potentially acting as an eavesdropper. We conduct an in-depth analysis using the concept of fractional equivocation to assess the severity of eavesdropper's decodability of the information. The chosen secrecy metric offers a more comprehensive understanding of secrecy in SWIPT-CRN, facilitating the design of secure communication systems with diverse perspectives on secrecy measurement. We derive a closed-form analytical expression for the exact generalized secrecy outage probability (GSOP) of the network. This expression conveys the GSOP's dependence on system parameters associated with the eavesdropper's decoding capability, which we illustrate through numerical analysis. Asymptotic analysis is performed to gain better insights into the system.