Optimization of Subband Reconstruction for Integrated Communication and Cancellation System

In electronic countermeasures, spread spectrum and hopping communication systems are threatened by broadband inter-ference. To process broadband blocking interference, the Integrated Communication and Cancellation System (ICC) im-proves the interference suppression performance by dividing the broadband signal into processing subbands with the nar-rower bandwidth. The ICC with subband division needs to reconstruct and restore the broadband signal from the divided narrowband signal and it may lead to distortion for the reconstructed communication signal. In this paper, a subband divi-sion and signal reconstruction framework by combining the analog filter with digital filter processing is proposed. The phase calibration methods and digital filter design are proposed to improve the amplitude and phase consistency of the recon-structed signal across subbands. The simulation results show that the subband cancellation can effectively enhance broadband interference suppression capability. Meanwhile, the proposed amplitude consistency optimization effectively reduces the reconstruction error within 0.001dB. The proposed phase calibration method effectively reduces the bit error rate of the reconstructed communication signal, and the maximum deviation from the theoretical bit error rate of the minimum shift keying (MSK) signal is not more than 0.1%.