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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。
IEEE 802.16e downlink has a special sub-channel allocation. For this sub-channel allocation, generally based on the cluster-based two-dimensional channel estimation algorithm. Firstly, the principle of the algorithm is introduced. The BER performance of the system when different interpolation algorithms are used in the frequency domain is compared with each other. The algorithm is simulated and analyzed under low, medium and high speed respectively. The simulation results show that the system performance is best and the complexity is low when the linear interpolation algorithm is used in the frequency domain. At the same time, it also shows that the cluster-based two-dimensional channel estimation algorithm has good adaptability to the mobile environment.