Blind user detection in doubly-dispersive DS/CDMA channels

Computer Science – Information Theory

Scientific paper

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Accepted for publication on IEEE Transactions on Signal Processing

Scientific paper

10.1109/TSP.2009.2033001

In this work, we 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 we 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 cochannel interference and high user mobility.

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