Energy detection method based on double-threshold power spectrum double-average ratio
An energy detection and power spectrum technology, applied in the field of cognitive radio, can solve the problem that the power spectrum double average ratio algorithm cannot calculate the high false alarm rate, and achieve the effect of improving performance and robustness, and improving detection performance.
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[0016] Specific implementation mode one, combination Figure 1 to Figure 5 Explain that this embodiment, based on the dual-threshold power spectrum dual-average ratio energy detection method, includes the following steps:
[0017] Step 1: Find the dual threshold value under dual threshold energy detection γ 0 And γ 1 ;
[0018] In the cognitive radio spectrum sensing model, the model of whether the primary user (Primary User, PU) exists can be established as a binary hypothesis test. The formula is described as follows:
[0019]
[0020] Among them, x(n) represents the transmitted signal, y(n) is the signal received by the receiver, h is the channel gain during signal transmission, and v(n) is the additive white Gaussian noise in the AWGN channel, the channel average u h =1, variance H 0 Indicates that the main user does not use the detection frequency band, so the receiver only receives noise signals, H 1 It means that the primary user is using the detection frequency band, so seco...
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