基于抽头探测的MB-OFDM超宽带信道估计

Channel estimation for MB-OFDM UWB system based on tap detecting

在MB-OFDM超宽带系统中,针对超宽带信道的稀疏特性,提出一种新的基于抽头探测的信道估计算法(MP-DFT)。利用DFT(Discrete Fourier Transform)算法得到信道的原始估计值,采用匹配追踪(MP)算法探测出非零抽头的位置,最后将剩余抽头置零得到稀疏信道参数。仿真结果表明,对于4种标准的超宽带信道模型,MP-DFT算法相比DFT算法性能都有所改善,尤其对于稀疏性较好的CM1和CM2信道,算法性能有明显提高。

A novel channel estimation algorithm is proposed for MB-OFDM Ultra Wide-Band systems based on tap detecting by exploiting the sparse property of channel impulse response. The channel parameters are estimated using the DFT algorithm based on cyclic convolution property of the receive signals. The nonzero taps are detected by exploiting the matching pursuit （MP） algorithm. The new estimated channel parameters are obtained by forcing the zero taps to zeros. Simulation results demonstrate that it has better MSE （mean square error） performance for the four channels proposed by IEEE. Especially for CM1 and CM2 channels, the performance of the algorithm has been greatly improved.