Abstract
In this paper, we investigate simultaneous wireless information and power transfer systems for multiuser multiple-input single-output secure broadcasting channels. Considering imperfect channel state information, we introduce a robust secure beamforming design, where the transmit power is minimized subject to the secrecy rate outage probability constraint for legitimate users and the harvested energy outage probability constraint for energy harvesting receivers. The original problem is non-convex due to the presence of the probabilistic constraints. With the aid of Bernstein-Type inequalities, we transform the outage constraints into the deterministic forms. Based on a successive convex approximation (SCA) method, we propose a low-complexity approach, which reformulates the original problem as a second-order cone programming problem. Also, we prove the convergence of the SCA-based iterative algorithm. Simulation shows that the proposed scheme outperforms the conventional method with lower complexity.
Original language | English |
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Pages (from-to) | 7610-7620 |
Number of pages | 11 |
Journal | IEEE Transactions on Wireless Communications |
Volume | 15 |
Issue number | 11 |
DOIs | |
Publication status | Published - Nov 2016 |
Externally published | Yes |
Keywords
- SWIPT
- outage probability
- physical-layer secrecy
- robust optimization
- successive convex approximation
ASJC Scopus subject areas
- Computer Science Applications
- Electrical and Electronic Engineering
- Applied Mathematics