Influence of original states of electronic-controlled attenuators to adaptive interference cancellation system

Adaptive interference cancellation is to solve the radiation interference between transmitter and receiver working on the same platform. The outputs of multipliers that are in feedback control module, after integralization and amplification, are to control the electronic-controlled attenuator. Because of zero drifts of multipliers and limitation of linearity range of electronic-controlled attenuators, the original states of the electronic-controlled attenuators may be linearity or saturation. Considering zero drifts of multipliers, the paper researches the influence of original states of electronic-controlled attenuators to the adaptive interference cancellation system. The simulation analysis and testing results indicate that when the original states of attenuators are linearity, the speed of cancellation is quick, and as the zero drifts of the multipliers are small, the interference cancellation ratio (ICR) is big, and when the original states of attenuators are saturation, the speed of cancellation is slow, and as the zero drifts of the multipliers are big, the ICR is small.