Patent ID: 7386078

Claim:
A method for filtering a radio signal in a radio communication system with at least one temporarily transmitting station and at least one receiving station which communicate with each other at corresponding times via a radio interface having a plurality of radio channels and a radio spectrum, each radio channel having a restricted bandwidth, comprising: transmitting a send signal with at least one of data and signalling information over a transmission channel among the radio channels for receipt as a received signal at a receiving station; determining whether at least one interfering signal is present and where on the radio spectrum the interfering signal is located relative to the transmission channel by determining first and second signal-to-noise ratios of the received signal using narrow and wide receive band filtering, respectively, calculating a difference between the first and second signal-to-noise ratios, and comparing the difference with at least one threshold to conclude that there is interference from an adjacent channel if the difference is larger; and filtering out the at least one interfering signal using a receive filter.