Abstract:

To eliminate the impact of constant modulus interference on civil aviation VHF voice communication,the anti-interference receiver based on single-channel constant modulus algorithm has been designed and implemented on FPGA and DSP platform. First the carrier frequency of interfered AM signal is estimated by using DSP in the interference suppression system of the anti-interference receiver,then the processes of carrier suppression,orthogonal transformation as well as real-time estimation of the constant modulus interference based on nonlinear least square method and interference suppression are implemented in FPGA. System testing demonstrates the anti-interference receiver can suppress interference effectively and has the features of fast processing and good stability.

Key words: single-channel constant modulus algorithm, interference suppression, FPGA, DSP