A blind subspace frequency-domain channel estimation algorithm based on redundant precoding was proposed for single-carrier system with frequency-domain equalization and space-time block codes (STBC-SC-FDE) over fre-quency-selective fading channels. Blind channel identifiability was guaranteed up to one scalar ambiguity, and the resid-ual scalar ambiguity could be resolved. The proposed algorithm can estimate the channel impulse response of STBC-SC-FDE systems with redundant precoder only relying on the second-order statistics of the received frequen-cy-domain signal. Simulation results confirm the proposed algorithm is stable and reliable, and has high estimation and equalization performance.% 针对频率选择性衰落信道下空时分组编码单载波频域均衡(STBC-SC-FDE)系统的信道盲估计问题，设计了一种基于冗余预编码的频率域盲子空间信道估计算法，并讨论了算法的可辨识性条件以及去模糊度方法。该算法仅利用冗余预编码 STBC-SC-FDE 系统的频率域接收信号的二阶统计量即可获得系统的时域信道响应。仿真结果表明，算法稳定、可靠，具有良好的估计精度和均衡性能。
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