The invention provides an uplink carrier frequency tracking method of multiuser blocked transmission system, meeting the following conditions of: a. after a user u is captured through carrier frequency bias, the remaining relative carrier frequency bias is controlled within 2% and b. timing synchronization has been completed; the tracking method comprises the steps of: (1) the system enters normal tracking state, base station backups the received original multiuser uplink time-domain base-band signal for each user, the base station uses frequency bias estimated value to correct the bias and simultaneously selects correction threshold delta1 needed for returning frequency bias estimated value; (2) according to the current frame channel estimated and judged results, the base station reconstructs time-domain signal not containing frequency bias, corresponding to signal of the user u and calculates frequency bias estimated value; (3) using the steps (1) and (2) to correct the bias and estimating the frequency bias value. Based on signal reconstruction, it can effectively inhibit slow migration of carrier frequency, the calculating complexity is low, the tracking speed is high, the accuracy is high, and it does not occupy spectrum resources, raising transmitting efficiency. |