Modeling and Experimental Study of Full-Duplex Channel Characteristics for Phased Array Simultaneous Transmission and Reception

Aiming at the application of full-duplex (FD) method in phased array, the coupling path characteristics for different spatial links are modeled by adaptive system identification method based on practical experiments. From the experiments' results, the conclusions that, the thousands of coupling paths among the phased array need to be modeled separately, and the self-interference cancellation for different coupling paths must be dealt with using individual coefficients, can be reached. At the same time, the normalized least mean square (NLMS) algorithm is used to adaptively cancel the coupling interference. The results show that the interference can be cancelled about 38dB for wideband signal of 300MHz bandwidth, and about 68dB for single-frequency signal. For broadband channel feature modeling, more order adaptive filter systems are needed. In addition, the channel characteristics during phased array scanning are also analysed.