对IEEE 802．16e OFDMA下行链路信道估计方法的仿真研究

IEEE 802．16e下行链路具有特殊的子信道分配方式。针对这种子信道分配方式，一般采用基于簇的二维信道估计算法。文章首先介绍了算法的原理，重点比较了频域采用不同插值算法时的系统BER性能，并分别在低、中、高车速条件下对算法进行仿真分析。仿真结果表明，频域采用线性内插算法时系统性能最好且复杂度较低，同时也表明，基于簇的二维信道估计算法对移动环境有良好的适应性。

Simulation Study of Channel Estimation in IEEE 802.16e OFDMA-Downlink

For IEEE 802.16e downlink system, the way of subchannel allocation is specific. For this special scheme, a cluster-based two-dimensional channel estimation method is proposed. In this paper, the principle of the algorithm is told of first, and then, the BER performance of the system is emphatically compared when different interpolation algorithms are used, and simulations in various channel conditions are implemented. The simulation results show that the linear interpolation has better performance and lower computational complexity, and that the cluster-based two dimensional channel estimation method is quite suitable for mobile environment.