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Joint Cooperative Beamforming and Jamming to Secure AF Relay Systems With Individual Power Constraint and No Eavesdropper's CSI

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4 Author(s)
Hui-Ming Wang ; School of Electronic and Information Engineering, MOE Key Lab for INNS, Xi'an Jiaotong University, Xi'an, Shaanxi, P. R. China ; Miao Luo ; Xiang-Gen Xia ; Qinye Yin

Cooperative beamforming and jamming are two efficient schemes to improve the physical-layer security of a wireless relay system in the presence of passive eavesdroppers. However, in most works these two techniques are adopted separately. In this letter, we propose a joint cooperative beamforming and jamming scheme to enhance the security of a cooperative relay network, where a part of intermediate nodes adopt distributed beamforming while others jam the eavesdropper, simultaneously. Since the instantaneous channel state information (CSI) of the eavesdropper may not be known, we propose a cooperative artificial noise transmission based secrecy strategy, subjected to the individual power constraint of each node. The beamformer weights and power allocation can be obtained by solving a second-order convex cone programming (SOCP) together with a linear programming problem. Simulations show the joint scheme greatly improves the security.

Published in:

IEEE Signal Processing Letters  (Volume:20 ,  Issue: 1 )