標題: Power Allocation for Artificial-Noise Secure MIMO Precoding Systems
作者: Tsai, Shang-Ho
Poor, H. Vincent
電機工程學系
Department of Electrical and Computer Engineering
關鍵字: Artificial noise;beamforming;MIMOME;MISOME;physical layer security;power distribution;precoding;secrecy capacity;wire-tap channel
公開日期: 1-七月-2014
摘要: This paper investigates the power allocation problem for artificial noise (AN) secure precoding systems, and proposes closed-form solutions for maximizing the achievable secrecy rate. It is assumed that the transmitter knows the full channel information at the legitimate receiver, and knows only the statistics of the channel information at the eavesdropper. Lower bounds are derived for the secrecy rates in multiple-input single-output channels with single or multiple eavesdroppers and multiple-input multiple-output channels with multiple eavesdroppers. When the number of transmit antennas is sufficiently large, the bounds are tight, and closed-form solutions can be derived from these bounds. The analytical results suggest simple and yet informative solutions as follows: Let the numbers of receive antennas at the legitimate receiver and at the eavesdropper be N-r and N-r,N-e, respectively. The system should distribute N-r,N-e/(N-r + N-r,N-e) of the power to AN in the high SNR regime, and distribute zero power to AN in the low SNR regime; the rate loss due to the eavesdropper is -N-r log (N-r/(N-r + N-r,N-e)) - N-r,N-e log(N-r,N-e/(N-r + N-r,N-e)) bits/sec/Hz in the high SNR regime and nearly negligible in the low SNR regime. The derived results also show that equal power and water-filling power allocations lead to similar solutions and rate loss. Simulation results corroborate the theoretical results.
URI: http://dx.doi.org/10.1109/TSP.2014.2329273
http://hdl.handle.net/11536/24619
ISSN: 1053-587X
DOI: 10.1109/TSP.2014.2329273
期刊: IEEE TRANSACTIONS ON SIGNAL PROCESSING
Volume: 62
Issue: 13
起始頁: 3479
結束頁: 3493
顯示於類別:期刊論文


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  1. 000338123600016.pdf