Hybrid Spatio-Temporal Artificial Noise Design for Secure MIMOME-OFDM Systems

摘要

This paper investigates artificial noise injection into the temporal andspatial dimensions of a legitimate wireless communication system to secure itstransmissions from potential eavesdropping. We consider a multiple-inputsingle-output (MISO) orthogonal frequency division multiplexing (OFDM) systemin the presence of a single-antenna passive eavesdropper and derive both thesecrecy rate and average secrecy rate of the legitimate system. It is assumedthat the legitimate transmitter knows the full channel information of thelegitimate transceivers but does not know the instantaneous channel stateinformation of the passive eavesdropper. Closed-form expressions for thesecrecy rate and average secrecy rate are derived for the asymptotic case witha large number of transmit antennas. We also investigate 1) the powerallocation between the data and the AN; 2) the power allocation between thespatial and the temporal AN. Computer simulations are carried out to evaluatethe performance of our proposed artificial noise scheme.