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In this paper, the authors consider spectrum sensing of DVB-T signals in different fading environments. They compare state-of-the-art detectors including detectors based on pilot subcarriers, as well as detectors for general OFDM signals that exploit the correlation structure incurred by the cyclic prefix. Energy detection is also included for comparison. They show numerically that the choice of detector depends on the scenario, the detector requirements, and on the available prior knowledge. They also show that it is possible to obtain good detection performance by exploiting the correlation, even in a frequency selective channel.
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