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Joint Design of Optimal Precoding and Cooperative Jamming for Multiuser Secure Broadcast Systems | IEEE Journals & Magazine | IEEE Xplore

Joint Design of Optimal Precoding and Cooperative Jamming for Multiuser Secure Broadcast Systems


Abstract:

A multiuser secure broadcast system is considered, where there are one multiantenna base station (BS), multiple single-antenna legitimate users, one multiantenna friendly...Show More

Abstract:

A multiuser secure broadcast system is considered, where there are one multiantenna base station (BS), multiple single-antenna legitimate users, one multiantenna friendly jammer (FJ), and one multiantenna eavesdropper (Eve). We jointly design the optimal precoding matrix at the BS and the jamming covariance matrix at the FJ by minimizing the total transmit power of the BS and FJ under the signal-to-interference-plus-noise ratio constraints at the users and Eve. To solve this challenging problem, when the FJ has more antennas than the users and Eve, we first find the optimal structure of the jamming covariance matrix and, then, convert the problem into its equivalent convex form. Also, we propose an iterative algorithm to jointly design the precoding and jamming covariance matrices in all scenarios. The solution obtained by this algorithm is shown to be asymptotically optimal when the FJ has more antennas than the users and Eve. Numerical results show that the proposed schemes considerably outperform the existing schemes.
Published in: IEEE Transactions on Vehicular Technology ( Volume: 66, Issue: 11, November 2017)
Page(s): 10551 - 10556
Date of Publication: 03 August 2017

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