Physical layer security joint beamforming method of bifunctional MIMO radar communication system

Abstract

The invention discloses a physical layer security joint beamforming method for a bifunctional MIMO radar communication system, relates to the technical field of radar communication, and aims to solve a problem that two design defects exit in the prior art, namely, only an AN covariance matrix is designed and the low system secrecy rate is caused by adopting a relaxation algorithm with poor performance. According to the method, with utilization of a cost function of a radar transmission beam directional diagram, an MIMO radar performance constraint, a QoS (communication quality of service) constraint, a PLS (physical layer security constraint), the constraint of each antenna of a system and the constraint of total power of the system are added in sequence, an optimization problem is constructed, then SDR relaxation is utilized to solve the optimization problem, and the optimization problem is solved. And the optimal solution of the relaxation problem is also the optimal solution of the original problem. According to simulation analysis, under the condition that the multi-user communication security problem of the dual-function radar and the communication system is considered, the radar performance of an original system can be well guaranteed through the SDRPLS algorithm and the ZFPLS algorithm, and meanwhile the secrecy rate of the system is improved.

Description

technical field [0001] The invention relates to the technical field of radar communication, in particular to a dual-function MIMO radar communication system physical layer security joint beamforming method. Background technique [0002] DFRC (Dual Function Radar Communication) technology has advantages in terms of power consumption, physical hardware, and spectrum utilization. It is a promising wireless communication solution that can support autonomous driving, Internet of Things, etc. The DFRC system transmits dual-function signals from a single hardware platform for simultaneous target detection and communication, and can be used for joint sensing and signal operations through real-time cooperation. In general, DFRC designs fall into two categories: information embedding and transmission wave shaping. The former generally embeds the communication data into the radar waveform through methods such as phase and frequency modulation, but this type of method has the obvious d...

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Problems solved by technology

[0005] The purpose of the present invention is: aiming at two design flaws existing in the prior art, that is, only designing the AN covariance matrix and adopting the relaxation algorithm with poor performance leads to the problem that the system secrecy rate is low, and proposes the physical layer of the dual-function MIMO radar communication system Security Joint Beamforming Method

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