【摘要】 提出了一种新的空时分组编码(STBC)-正交频分复用(OFDM)系统的信道估计方法。该方法通过插入经过空时编码的训练序列,在时域里进行信道估计。通过分析,表明了自相关具有零相关区(ZCZ)的序列是最小平方(LS)意义下的最优训练序列。该方法解决了文献中提到的复数多相训练序列硬件实现复杂度高且对序列长度有限制的缺点。由于无需对接收到的训练序列进行离散傅立叶变换(DFT),且不涉及矩阵求逆,所以计算复杂度低。仿真实验结果表明了该方法的有效性。更多还原

【Abstract】 A new channel estimation method is proposed for space-time block-coding(STBC)-orthogonal frequency division multiplexing(OFDM) system.By inserting training sequences coded by STBC,channel estimation is performed in time domain.By analysis,it is verified that the sequences whose auto-correlation has zero correlation zone(ZCZ) is the optimal sequences when least square(LS) algorithm is used.The complex polyphase sequences proposed is difficult to realize by hardware and sequence is limited by length,this drawback is overcomed by this method.Without discrete Fourier transform(DFT) and matrix inversion,the computation complexity is very low.A simulation is carried out to demonstrate the effectiveness of the proposed method.更多还原