快衰落信道下OFDM系统的信道估计简化算法

A simplified channel estimation method for OFDM system with fast fading channels

在快衰落时变信道中,正交频分复用(OFDM:Orthogonal Frequency Division Multiplexing)系统子载波间的正交性会遭到破坏,由此引起的载波间干扰(ICI:Inter-Carrier Interference)会对系统性能带来很大的影响。本文提出了一种利用时域线性模型的信道估计算法,利用随时间线性变化的模型描述信道。仿真结果表明,本算法能够有效地消除载波间干扰,降低系统的BER。与类似算法相比,当系统的BER性能相同时,算法复杂度大大的降低。

A loss of subchannel orthogonality due to time- variant muhipath channels in Orthogonal Frequency Division Multiplexing （OFDM） systems leads to intercarrier interference （ICI） which increases the error of system. In this paper, a simplified channel estimation method using time - domain linear model is proposed, assuming that the channel impulse response varies in a linear fashion during an OFDM symbol time - duration. The simulation result shows that this method can reduce ICI effectively and maintain the performance of the system while reducing the complexity effectively.