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The system complexity, detection probability and average acquisition time are the most important performances. This paper proposes a novel method to reduce false-alarm probability and improve these performances, which utilizes the changes of power spectral density between in-sync and out-of-sync, and uses the difference of signals in-band and out-of-band instead of the signals in-band as the inputs of threshold comparator. What is more, this paper also proposes an adaptive threshold adjustment technology, which bases on the average power spectral density of received signals. At last, the simulation results are given.