Study of Simultaneous Transmit and Receive Phased Array Based on Genetic Algorithm

As a result of the rapid progress in mobile communication technology, it has become increasingly challenging to meet users' demands with the existing limit resources. To address this issue, scholars have turned to the simultaneous transmit and receive (STAR) technology, which efficiently conserves time resources and spectrum resources by enabling transmit and receive antennas to operate simultaneously and in the same frequency band. However, when transmitters and receivers in a phased array radar operate simultaneously, a significant amount of self-interference (SI) signal is generated, making it challenging to detect external signals and rendering the performance of system ineffective. Therefore, solving the coupling issue of self-interfering signals is crucial in enhancing the performance of STAR system. In this paper, the digital self-interference cancellation (SIC) and adaptive digital beamforming (ABF) are integrated to improve system's isolation. The simulation results indicate that the effective isotropic isolation (EII) at the receiver can reach a maximum of 159.21 dB when transmitting with the power of 1000 W. This value is 39.75 dB higher than that achieved through SIC alone and 113.27 dB higher than the result without both SIC and ABF.