准同步空时编码多载波码分多址系统的盲多用户检测

o solve the problem that the accuracy and the computational complexity of conventional sub-space based algorithms for quasi-synchronous space-time coded multicarrier code-division multiple access system, we proposed a new system model and its blind MMSE multiuser detection algorithm in this paper. The proposed algorithm exploits the property of QR decomposition to estimate the transmit delay and the channel blindly, and then perform the MMSE based multiuser detection. Computer simulation results show that the proposed algorithm can improve the system SNR 4.5dB approximately in the case that the active user is 16, the BER is and the base-station is equipped with 4 antennas.