Blind Estimation of Multicarrier CDMA Sub-Carrier Frequencies Based on the High-Order Cyclic Cumulants

This paper proposed a method to estimate sub-carriers frequencies of multi-carrier CDMA signals utilizing higher-order cyclic cumulants, based on the cyclic stationary characteristic of multi-carrier CDMA signals. Because higher-order cyclic cumulants can effectively suppress stationary noise and non-stationary Gaussian noise, through theoretical analysis, we can prove that the higher-order cyclic cumulant of the multi-carrier CDMA signal using BPSK/QPSK modulation only exist in the cycle frequency of sub-carrier frequency under the above noise background, so it can estimate the sub-carrier frequencies of multi-carrier CDMA signals by detecting the peaks of cyclic frequencies. Theoretical analysis and simulation results have verified the correctness and effectiveness of the algorithm.