Analysis of modeling and interference suppression requirement of multi-source wideband interference cancellation

To solve the problem of multi-source interference suppression in wideband interference cancellation, the theoretical model of multi-source wideband interference cancellation was established, and the influence law of the number of sampling antennas and time-domain filters on the interference suppression performance was obtained. The effect of correlation between interference sources on interference suppression performance was analyzed, and the difference of ICR (interference cancellation ratio) between multiple interference sources and single interference source was studied, and the compression coefficient was proposed as an index to measure the interference cancellation ratio of multiple interference sources. And the interference suppression requirement of multi-source wideband interference cancellation was obtained. Experiment results show that increasing the number of sampling antennas and time domain filters can significantly improve the interference cancellation ratio of the double interference sources. Besides, in the same scene, the ICR of double interference sources is more than 10 dB lower than that of single interference source. As the power difference between two interference sources becomes larger, the compression coefficient decreases, and the interference cancellation ratio gradually decreases. When the power difference between the two sources exceeds 25 dB, the compression coefficient is close to 1, and the double interference sources are equivalent to single interference source.