To deal with the problem of blind estimation of spreading codes and information sequences for space-time block coded multi-carrier CDMA signals

combined with SMC (Sequential Monte Carlo) and Kalman filtering techniques

this paper introduces a fast blind despreading algorithm by making full use of the orthogonality property of the STBC and the OFDM multi-carrier modulation.Firstly

the proposed algorithm segments the signal model through different symbols and antennas.Secondly

use Kalman filtering method to update the mean and covariance iteratively.Then

use a set of properly weighted samples to approximate the joint posterior distribution

Finally

exploit these samples to estimate the quantity of interest

which improve the computational efficiency greatly.The theoretical analysis and simulation results verify the effectiveness of the proposed algorithm.