Interference energy detection is the foundation for the algorithm of interference suppression.General energy detection algorithm is simple and easy to be implemented,but the performance is easily influenced by the uncertainty of the background noise.An adaptive frequency domain energy detection algorithm which was based on frequency domain interference suppression algorithm model was presented in this paper.This algorithm set the threshold of signal through estimating the background noise power,adjusted the reference value adaptively based on the processed signal power.The simulation results showed that this algorithm could effectively eliminate the influence of the uncertain background noise.The performance of detection was much better than general energy detection algorithm extremely under narrowband interference condition.
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