In this paper, we propose two training-sequence-based channel estimation approaches for OFDM systems with transmitter diversity by tracking the delay-subspace and the amplitudes of the CIR or its DFT.

• 第二种方法对信道时域冲激响应的离散傅里叶变换(DFT)进行跟踪；进一步提高了信道估计性能.