Patent ID: 8638892
Filing Date: 2014-01-28
Classification: H03H

Abstract:
1. A receiver to process a received signal, the receiver comprising: an adaptive circuit operable to receive an input signal comprising a narrowband interference (NBI) signal, the adaptive circuit further operable to supply an output signal comprising at least a portion of the NBI signal filtered at a first, frequency changing adaptively over time, said portion of the NBI signal having a bandwidth narrower than the input signal, and wherein the adaptive circuit is operable to supply a second output signal comprising a second portion of the NBI signal having a second frequency; a first tone predictor coupled to the adaptive circuit to receive the output signal, the first tone predictor having a first tone prediction line to supply thereon a first predicted tone signal derived by use of said portion of the NBI signal at a plurality of past times differing from one another by a predetermined duration of time; a second tone predictor operable to receive the second output signal, the second tone predictor having a second tone prediction line to supply thereon a second predicted tone signal derived from another portion of the NBI signal; a first arithmetic unit operable to receive said received signal, the first arithmetic unit subtracting from the received signal a sum of the first predicted tone signal and the second predicted tone signal, to generate a version of the received signal comprising a remote signal but lacking the first predicted tone signal and the second predicted tone signal; a slicer coupled to the first arithmetic unit, the slicer operable to supply a modulated signal obtained by slicing said version of the remote signal, received from the first arithmetic unit; a second arithmetic unit coupled to the adaptive circuit to supply thereto said input signal comprising the NBI signal, the second arithmetic unit being further coupled to the slicer to receive therefrom the modulated signal, and the second arithmetic unit operable to receive said received signal, the second arithmetic unit subtracting from the received signal, at least the modulated signal, thereby to generate said input signal comprising the NBI signal; and a third arithmetic unit coupled to the first tone prediction line and the second tone prediction line, the third arithmetic unit coupled to the first arithmetic unit, the third arithmetic unit supplying to the first arithmetic unit the sum of the first predicted tone signal and the second predicted tone signal.