A Novel Interference Suppression Algorithm Based on Analog Circuits Preprocessing
Xiaolei Sun
,
Chunteng Li
,
Guangming Li
and
Juan Chu
Aiming at two problems of the low radiation efficiency of the transmitted antennas and facing strong interference in extremely-low-frequency (ELF) communication, a new structure of a receiving array is proposed, and the signal preprocessing scheme in the receiver front-end is designed, which can suppress 50Hz interference and its harmonic components effectively, thereby enhancing the detective ability on the weak desired signal. In order to suppress the interference within signal bandwidth, a novel improved generalized sidelobe cancellation algorithm (IGSCA) is proposed. By combining with the proposed receiving array structure, the problem on the desired signal radiated into the reference antennas has been addressed effectively. In order to test the proposed algorithm's performance, an experimental platform is set up under the laboratory environment, mainly adopting a data acquisition unit named NI 9184. The results show that the proposed algorithm can improve the better signal-to-noise-plus-interference ratio (SINR) to a great extent, and the more the number of reference antennas is, the higher the improved performance is.
