说明：  In this paper, the problem of estimation of fast time-varying radio channels is considered. A new algorithm, Iterative Channel Estimation is presented. This algorithm is designed for radio channel estimation in multiple-input multipleoutput systems with space-time block coding. The channel transfer matrix is estimated on the basis of a previously decoded data, so it can be performed simultaneously with the data transmission. The estimation process is a simple operation, just a multiplication of two matrices. As a result, bit error rate is reduced. The algorithm is compared to the differential space-time block codes and verified by Monte-Carlo simulations.