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《Journal of Circuits and Systems》 2009-01
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Carrier detection method of direct sequence spread spectrum signals based on Duffing oscillator

JIN Hu,WANG Ke-ren(Department of Information Engineering,Electronic Engineering Institute,Hefei 230037,China)  
Duffing oscillator has characteristic of sensibility to small periodic signals and immunity against noise.By making use of the characteristic,the sine signal is detected which derives from square transform of binary-phase-shift-keyed and direct-sequence-spread-spectrum(DSSS/BPSK) signal and is submerged in strong noise.Technique of Duffing oscillator small signal detection is introduced first.Then we expatiate on the detection method,and present relative curve and equation between minimum reachable signal to noise ratio(SNR) and phase difference of DSSS/BPSK signal and the reference signal of Duffing oscillator.The simulations show that DSSS/BPSK signal can be detected at SNR=-38.35dB by the method presented here.
【CateGory Index】: TN914.42
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