A symbol rate estimation algorithm for linearly mixed digital modulation signals

In allusion to the property of transient state on the border of adjacent different symbols for digital modulated signals, a new symbol rate estimation algorithm based on wavelet transform (WT) for digital modulation signals mixed linearly is proposed. In this algorithm, we utilize WT and twice WT to multi-channel linearly mixed signals after frequency conversion, respectively, and detect the jump border of mixed signals, then we take Fourier transform to coefficients of WT, symbol rate information can be extract from spectrum of WT coefficients. Computer simulations are performed for common digital modulation signals. The results show that the algorithm proposed in this paper can estimate the symbol rate for linearly mixed modulation signals effectively.