Blind despreading of WCDMA signals

Aiming at despreading Wideband Code Division Multiple Access (WCDMA) signal blindly, the phase of Gold sequence is estimated firstly by utilizing the maximum value of the fourth-order cumulant slice of the product of WCDMA signal with the optimum m-sequences of different delays, and then the signal is descrambled. With the utilization of particular structure of OVSF codes, the signal is synchronized through the maximum value of cross-correlation function of signal´s segments. By calculating the cross-correlation of each row of Hadamard matrix with the signal that has been descrambled and synchronized before, the OVSF code is obtained from the column of the matrix corresponding to the largest value of the cross-correlation function, and the signal is despread finally. Simulation results show the better performance of the proposed method in despreading WCDMA signals under the background of additive white Gaussian noise.