Patent ID: 7250541

Claim:
A method of suppressing a narrow-band interference in a broadband communication system, wherein a broadband noise signal is formed in the transmission channel in a frequency band (F 0 , F 1 ); the broadband noise signal is modulated by a given modulation technique to modulate the power thereof at a modulation frequency F mod <<(F 1 −F 0 ); the resultant signal is passed through a propagation medium and received by the receiver together with a narrow-band interference superimposed thereon in the propagation medium, and filtered in the frequency band (F 0 , F 1 ); two signals are formed, one of which is obtained by amplifying the signal filtered in the frequency band (F 0 , F 1 ) and limiting the amplitude thereof, and the second signal is the above filtered signal or a filtered signal linearly amplified without altering the shape thereof; the two signals thus obtained are multiplied; the resultant signal is filtered in the frequency band [ΔF nar , (F 1 −F 0 )]; and the envelope of the signal obtained is separated and demodulated to obtain an information signal, wherein ΔF nar is the frequency band of the squared amplitude variation spectrum of the interference voltage.