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In this paper, the authors consider the problem of detecting the presence of a new user in a Direct-Sequence/Code-Division-Multiple-Access (DS/CDMA) system with a doubly-dispersive fading channel, and they propose a novel blind detection strategy which only requires knowledge of the spreading code of the user to be detected, but no prior information as to the time-varying channel impulse response and the structure of the multiaccess interference. The proposed detector has a bounded Constant False Alarm Rate (CFAR) under the design assumptions, while providing satisfactory detection performance even in the presence of strong co-channel interference and high user mobility.
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