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In wireless detection scenarios such as sensor networks or cognitive radio, "Hidden nodes" can occur due to channel fading, which can be overcome by collaborative sensing. This paper considers the performance of collaboration with combining and fusion methods for both static and fading environments, where each node employs energy detection for sensing an unknown source. The case of combined Rayleigh fading and shadowing is also considered, showing that AND fusion can have even lower performance than a single sensor. The authors' results show that choosing a fusion rule without considering the statistics of the fading environment can lead to very poor performance.
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