An anti-interference method for radio signals based on matching pursuit algorithm

Since the GSM-R (Global System for Mobile communications-Railways) antenna located on the train roof is very close to the catenary, it often receives electromagnetic transient disturbance due to sliding contact between the pantograph and the catenary. In order to suppress this transient noise and improve the reliability of communication, a transient noise suppressing method for radio signals based on matching pursuit algorithm is proposed. Firstly, An over-complete atomic library that matches only the transient noise in the mixed radio signal is constructed to implement the sparse decomposition of the transient noise. Then, the optimal matching atomic search of the transient noise is proceeded in the atomic library. In this paper, the GMSK modulation signal in GSM-R system is used as the radio signal to be denoised from the transient noise. The simulation results show that this method can effectively deal with the transient noise denoising problem of the radio signal with a high accuracy result and a low distortion of the radio waveform which keeps the original characteristics of the radio signal, the bit error rate of the radio signal polluted by transient noise is significantly reduced after the processing of the algorithm proposed.