Title :
Solutions for the MIMO Gaussian Wiretap Channel With a Cooperative Jammer
Author :
Fakoorian, S. Ali A ; Swindlehurst, A. Lee
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Univ. of California, Irvine, CA, USA
Abstract :
We study the Gaussian MIMO wiretap channel with a transmitter, a legitimate receiver, an eavesdropper and an external helper, each equipped with multiple antennas. The transmitter sends confidential messages to its intended receiver, while the helper transmits jamming signals independent of the source message to confuse the eavesdropper. The jamming signal is assumed to be treated as noise at both the intended receiver and the eavesdropper. We obtain a closed-form expression for the structure of the artificial noise covariance matrix that guarantees a secrecy rate larger or at least equal to the secrecy capacity of the wiretap channel with no jamming signal. We also describe how to find specific realizations of this covariance matrix expression that provide good secrecy rate performance, even when there is no nontrivial null space between the helper and the intended receiver. Unlike prior work, our approach considers the general MIMO case, and is not restricted to SISO or MISO scenarios.
Keywords :
Gaussian channels; MIMO communication; antenna arrays; cooperative communication; covariance matrices; jamming; wireless channels; MIMO Gaussian wiretap channel; SISO; artificial noise covariance matrix; closed-form expression; cooperative jamming antenna; eavesdropper; multiple antennas; nontrivial null space; receiver; secrecy capacity; transmitter; Covariance matrix; Jamming; MIMO; Mutual information; Noise; Receivers; Transmitters; Cooperative jamming; MIMO wiretap channel; interference channel; physical-layer security;
Journal_Title :
Signal Processing, IEEE Transactions on
DOI :
10.1109/TSP.2011.2161298