Abstract
This letter studies bi-directional secure information exchange in a simultaneous wireless information and power transfer system enabled by a full-duplex multiple-input multiple-output amplify-and-forward (AF) relay. The AF relay injects artificial noise (AN) in order to confuse the eavesdropper. Specifically, we assume a zeroforcing (ZF) solution constraint to eliminate the residual self-interference. As a consequence, we address the optimal joint design of the ZF matrix and the AN covariance matrix at the relay node as well as the transmit power at the sources. We propose an alternating algorithm utilizing semi-definite programming technique and 1-D searching to achieve the optimal solution. Simulation results are provided to demonstrate the effectiveness of the proposed algorithm.
Highlights
W IRELESS communication networks are inherently susceptible to sophisticated eavesdropping attacks; full-duplex wireless operation is even more prone to overhearing due to continuous transmission and reception by the full-duplex nodes
Where τ is the processing delay to implement FD operation and assumed short enough to be neglected as far as the achievable rate computation is concerned, nR CN (0, σR2I) is the additive white Gaussian noise (AWGN) at R, z[n] CN (0, Q), with Q 0, is the artificial noise (AN) used for interfering E, and yIRR[n] is the signal split to the information receiver (IR) at R given by yIRR[n] = √ρ(hARsA[n] + hBRsB[n] + HRRxR[n] + nR[n])
We study the performance of the proposed scheme in comparison with the relay-only optimization scheme
Summary
W IRELESS communication networks are inherently susceptible to sophisticated eavesdropping attacks; full-duplex wireless operation is even more prone to overhearing due to continuous transmission and reception by the full-duplex nodes. We consider SWIPT in a three-node MIMO relay network with nodes SA and SB, equipped with one transmit and one receive antennas for information transmission and reception, respectively, exchanging confidential information with the aid of a multi-antenna AF relay R, in the presence of a single antenna eavesdropper E. The relay receives confidential information from SA and SB, while in the phase, R amplifies and forwards the processed information to both nodes with the AN signal being superimposed to jam the eavesdropper [8]. OKANDEJI et al.: SECURE FD TWO-WAY RELAYING FOR SWIPT assumed to be equipped with a PS device, coordinates infor- with the relay output power expressed as mation decoding and energy harvesting.
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