A novel approach to FM interference suppression in DS spread-spectrum communication systems
A new recursive technique for the excision of FM interference in DS spread-spectrum communication system is introduced. The proposed algorithm tabulates the jammer-corrupted received samples as a matrix to model a time-varying process. Input vectors are sent into the matrix to produce upon multiplication output vectors from which the frequency information in the matrix is deduced. The scheme resembles the familiar closed-loop frequency response estimation procedures in classical control theories. The estimated frequency then tunes an adaptive notch filter for interference suppression. The method provides more accurate IF estimates than given by the Wigner-Ville distribution and a performance close to notch filtering at the exact IF at a significantly lower computational requirement.