Abstract
Frequency diverse array- (FDA-) based directional modulation (DM) is a promising technique for physical layer security, due to its angle-range dependent transmit beampattern. However, the existing schemes are not suitable for the broadcasting scenario, where there are multiple legitimate users (LUs) to receive the confidential message. In this paper, we propose a novel random frequency diverse array- (RFDA-) based DM scheme to realize the point to multi-point broadcasting secure transmission in both angle and range dimension. In the first stage, the beamforming vector is designed to maximize the artificial noise (AN) power, while satisfying the power requirement of LUs for transmitting the confidential message simultaneously. In the second stage, the AN projection matrix is obtained by maximizing signal-to-interference-plus-noise ratio (SINR) at the LUs. The proposed scheme only broadcasts the confidential message to the locations of LUs while the other regions are covered by AN, which promotes the security of the wireless broadcasting system. Moreover, it is energy efficient since the power of each LU is under accurate control. Numerical simulations are presented to validate the performance of the proposed scheme.
Highlights
Compared with wired communication, the evolution of wireless technology has brought many advancements with its effective features, such as flexibility, scalability, and low cost
Aiming at addressing the above-mentioned problems for wireless broadcasting systems, in this paper, we propose a novel energy-efficient multi-beam directional modulation (DM) scheme based on random frequency diverse array (RFDA)
The main contributions in this paper can be summarized as follows: (1) We proposed an energy efficient broadcasting DM scheme based on RFDA, in which the power of each legitimate users (LUs) is under accurate control
Summary
The evolution of wireless technology has brought many advancements with its effective features, such as flexibility, scalability, and low cost. In [1, 2], based on near-field direct antenna modulation, an analogue transmit architecture was proposed, which can prevent the eavesdroppers from correctly demodulating the signal. For the far-field scenario, a similar modulation scheme was demonstrated by adjusting each element’s phase shift properly [3, 4], so that the constellation of each symbol can be obtained in the derided direction and purposely distorted in other directions. These synthesis schemes require high speed radio frequency switches or phase shifters to be switched at the modulation rate, which limits their realization and application. In [9], the authors proposed an AN-aided
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