【摘要】 针对两发一收的OFDM系统,引入具有反转相移特性的导频序列,提出了一种新颖的基于离散余弦变换的信道估计方法.该方法有效地降低了不同发送天线上的导频信号之间的相互干扰,大大提高了信道估计精度.利用COST207TU信道模型进行仿真,结果表明,与传统梳状导频和相移导频方法相比,在同样的信噪比下,该方法得到的均方误差更小.更多还原

【Abstract】 A novel DCT-based channel estimation method is proposed for the OFDM system with two transmitter antennas and one receiver antenna,in which some inverse phase-shifted pilot sequences are introduced.It weakens efficiently the interference between the different transmitter antennas’ pilot sequences, and enhances the estimation accuracy.A simulation is performed by using the model of COST207TU.The simulation results show that the proposed method performs better than the traditional comb-type pilot method and the normal phase-shifted pilot method,since the obtained mean square error by the proposed method is lowest under same signal-to-noise ratio.更多还原