对IEEE 80216e OFDMA 下行链路信道估计方法的仿真研究.PDFVIP

2009年第06期，第42卷 通 信 技 术 Vol.42，No.06,2009 总第210期 Communications Technology No.210,Totally 对 IEEE 802.16e OFDMA下行链路信道估计方法的仿 真研究 董 楠， 张 盛， 林孝康 （清华大学 深圳研究生院，广东 深圳 518055） 【摘 要】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。 【关键词】IEEE 802.16e; 正交频分多址; 子信道分配; 信道估计 【中图分类号】TN92 【文献标识码】A 【文章编号】1002-0802(2009)06-0074-03 Simulation Study of Channel Estimation in IEEE 802.16e OFDMA-Downlink DONG Nan, ZHANG Sheng, LIN Xiao-kang (Graduate School in Shenzhen, Tsinghua University, Shenzhen Guangdong 518055, China) 【Abstract】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. 【Key words】IEEE 802.16e; OFDMA; subchannel allocation; channel estimation 0 引言