Abstract
In this paper, we research a synthesis scheme for secure wireless communication in the broadcasting multiusers directional modulation system, which consists of multiple legitimate users (LUs) receiving the same confidential messages and multiple eavesdroppers (Eves) intercepting the confidential messages. We propose a new type of array antennas, termed random frequency diverse arrays (RFDA), to enhance the security of confidential messages due to its angle-range dependent beam patterns. Based on RFDA, we put forward a synthesis scheme to achieve multiobjective secure wireless communication. First, with known locations of Eves, the beamforming vector is designed to minimize Eves’ receiving power of confidential message (Min-ERP) while satisfying the power requirement of LUs. Furthermore, we research a more practical scenario, where locations of Eves are unknown. Unlike the scenario of known locations of Eves, the beamforming vector is designed to maximize the sum received power of LUs (Max-LRP) while satisfying a minimum received power constraint at each LU. Second, the artificial-noise projection matrix (ANPM) is calculated to reduce artificial-noise (AN) impact on LUs and enhance the interference on Eves. Numerical results verify the superior secure performance of the proposed schemes in the broadcasting multiusers system.
Highlights
Wireless communications allow information flow through broadcasting to legitimate user (LU) in free space
Secure wireless communication has mainly relied on phased arrays directional modulation technology (PA-Directional modulation (DM)), but the transmit beam pattern only is angle-focusing independent of range. erefore, in this paper, we propose frequency diversity arrays directional modulation technology (FDADM) [5,6,7,8] for secure wireless communication due to its angle-range dependent transmit beam pattern
FDA-DM draws into a small frequency offset across the transmit element to produce a beam pattern that changes as time, range, angle, and frequency offsets change
Summary
Wireless communications allow information flow through broadcasting to legitimate user (LU) in free space. Erefore, in this paper, we propose frequency diversity arrays directional modulation technology (FDADM) [5,6,7,8] for secure wireless communication due to its angle-range dependent transmit beam pattern. In [21], the problem of robust, secure artificial noise-aided beamforming and power splitting design was investigated under imperfect channel state information (CSI) These two references mainly focused on simultaneous wireless communication and power transfer based on multiple-input single-output cognitive radio downlink network. Based on [22], we further study synthesis schemes to achieve multiobjective security wireless communication under known/unknown locations of Eves, respectively. In this paper, combined with convenient RFDA and AN, two proposed optimization methods of beamforming vector with known/unknown Eves’ locations can achieve multiusers secure communications. The notations R and C are used to indicate the real and complex number domains, respectively
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