Fast Power Allocation for Secure Communication With Full-Duplex Radio

• Published in: IEEE transactions on signal processing Vol. 65; no. 14; pp. 3846 - 3861
• Main Authors: Chen, Lei, Zhu, Qiping, Meng, Weixiao, Hua, Yingbo
• Format: Journal Article
• Language: English
• Published: IEEE 15.07.2017
• Subjects: Full-duplex; Interference; multicarrier; OFDM; Physical layer; physical layer security; power allocation; Resource management; secure communication; Security; Signal processing algorithms; Signal to noise ratio; Wireless networks
• ISSN: 1053-587X; 1941-0476
• DOI: 10.1109/TSP.2017.2701318

This paper considers a method for improving physical layer security of wireless networks with full-duplex radio. In particular, fast algorithms are developed to compute power allocations in subcarriers, subject to power and rate constraints, to maximize the secrecy capacity of a three-node network consisting of a source, a full-duplex destination, and an eavesdropper. A residual level of radio self-interference channel is considered. The optimal power allocation at the destination is found to be significant especially when its power budget is high. Also studied in this paper are a network with multiple full-duplex destinations and another network with multiple sources. Using the algorithms developed in this paper, we are able to show that a multiuser strategy that optimizes the power distributions among the users (in terms of either the sources or the destinations) can yield a substantial gain of secrecy capacity over a single-user strategy.