Wireless communication system with detectors for extraneous received signals

A wireless communication system comprising one or more base stations 104, and a plurality of remotely located terminal units 106. The base stations and the remotely located terminal units communicate data over operational wireless communication links between them. The base stations include at least one respective in-channel detector and at least one out-of-channel detector for detecting extraneous received signals such as radar. The in-channel detectors analyse signals over the operational communication links. The out-of-channel detectors include respective out-of-channel receiver elements that monitor possibly available channels alternative to the respective operational communication link channels and perform channel availability check (CAC) procedures on the possible available channels. The base stations store the respective channel parameters of channels that have successfully passed the CAC procedures and changes channel parameters for the operational communication links to the stored channel parameters for the alternative communication links without performing further CAC procedures.