Journal
IEEE SIGNAL PROCESSING LETTERS
Volume 23, Issue 11, Pages 1509-1513Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LSP.2016.2600105
Keywords
Beamforming; energy harvesting; multicast; physical-layer; relay; security
Categories
Funding
- National Natural Science Foundation of China [61401041, 61501046, 61271188, 61671072]
- Meteorological Information and Signal Processing Key Laboratory of Sichuan Higher Education [QXXCSYS201601]
- 111 Project [B08038]
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The relay-aided multicast network is considered, where an N-T-antenna source multicasts confidential messages to N single-antenna legitimate users via a self-sustainable M-antenna regenerative relay. In particular, the relay is powered by the energy harvested from the radio signal of the source, and there are K unauthorized eavesdroppers wiretapping the channel. Assuming the knowledge of statistical channel state information of eavesdroppers, we aim to minimize the source transmission power via energy-efficient beamforming, subject to the signal-to-noise ratios of legitimate users/ relay, the power constraint at the relay, and the outage constraints of the eavesdroppers. An efficient algorithm is developed by using the iterative first-order Taylor expansion and successive convex approximation, where the original nonconvex problem is transformed and solved.
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