Patent ID: 7525942

Claim:
A method, performed by a mobile unit or base station, for detecting narrowband interference in a wideband communication signal having a frequency bandwidth with a narrowband channel disposed therein, the method comprising: scanning the narrowband channel a plurality of times to determine a plurality of signal strengths at each of the plurality of scans; determining a correlation factor for the narrowband channel based on the plurality of signal strengths; comparing the correlation factor with a threshold correlation factor to determine presence of the narrowband interference in the narrowband channel; wherein scanning the narrowband channel a plurality of times further comprises continuously scanning the narrowband channel to generate a plurality of narrowband scans, and storing a plurality of signal strength observations, each of the plurality of signal strength observations corresponding to one of the plurality of narrowband scans; and wherein determining the correlation factor further comprises using a subset of the plurality of signal strength observations, wherein the subset of the plurality of signal strength observations are the most recent of the plurality of signal strength observations.