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中文摘要：
本文研究了OFDM空时发射分集系统的子空间信道盲估计方法。该方法仅利用空时编码及OFDM调制引入的冗余，在接收天线小于发射天线时，也可以对信道进行盲估计。对盲估计方法所共有的估计模糊性问题进行了详细的论述，证明估计仅存在两个标量不确定因子。这种方法不需要对信号进行冗余预编码，系统将有更高的速率；同时也不需要对系统输出进行过采样或采用多天线接收。由于不需要确切知道信道的阶数，算法对信道阶数过估计有较好的鲁棒性。
英文摘要：
This paper deals with a subspace-based blind channel estimation method for space-time coded OFDM system. Using only the redundant information inherent in space-time block coding （STBC） and OFDM modulation, channel state information （CSI） can be blindly estimated up to two scalar ambiguities ,even when the receiving antennae are less than transmitting antennae. The estimation ambiguity ,which is common to all blind method, is discussed in detail and we prove that there only exists two scalar indeterminacies. This method needs neither redundant pre-coding nor over-sampling or multiple receive antennae, thus has higher data rate. Besides, it is robust to channel order overestimation ,for only the upper bounds of channel orders are needed.
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