IEEE802.16e系统中基于基扩展模型的快速时变信道估计

Fast-varying channel estimation method based on basis expansion models in IEEE 802.16e systems

随着通信要求的不断提高,正交频分多址系统逐渐向快移动速度、多子载波数、高载波频率的方向发展,因此对快速时变信道进行估计及均衡的算法越来越受到广大研究人员的重视。针对IEEE 802.16e系统,采用基于基扩展模型估计其快速时变信道,使得接收机可以在计算复杂度相对较低的情况下更为准确地估计信道,克服了传统信道估计算法估计性能差和计算复杂度较高的缺点。仿真结果表明,基扩展模型信道估计算法性能明显优于传统的LS信道估计。

With the increasing requirements to communication technology, the moving speed becomes more rapid and the number of sub-carriers is getting larger and the carrier frequency becomes higher in orthogonal frequency division multiple access （OFD- MA）. Therefore, the fast-varying channel estimates and equalizer algorithms are attracting more attention among researchers. According to the IEEE 802.16e system, this study uses the basis expansion model （BEM） to estimate its fast channel, so that the receiver can estimate the channel more accurately in a relatively low complexity, to overcome the disadvantage of poor perform- ance and high computational complexity of traditional channel estimation. The simulation results show that the BEM channel esti- mation algorithm has better nerformance than the traditional LS channel estimaticm.