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In this paper, a combination method is presented to estimate the PN sequence's period of the direct sequence spread spectrum (DSSS) signal in strong narrow-band interference environment. An overlapping windowed FFT algorithm is first used to transform the received data signals to the frequency-domain where the elimination or drastical attenuation of the(More)
To solve the problems of most communication signals modulation recognition methods' computational complexity and classifier training difficulties, a method of modulation recognition is proposed based on particle swarm optimization(PSO) and support vector machine (SVM). Combine wavelet decomposition theory with the modulated signals' instantaneous(More)
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