自适应正交多载波频分复用调制方式选择的门限优化  

On the Optimization of Switching Thresholds in AOFDM Systems

作　　者：张朝阳[1] 赖利峰[1] 

机构地区：[1]浙江大学信电系通信与信息系统研究所,浙江杭州310027

出　　处：《电路与系统学报》2004年第4期21-25,62,共6页Journal of Circuits and Systems

基　　金：国家十五"863"基金资助项目(2002AA123044);国家自然科学基金资助项目(60002003)

摘　　要：本文研究了自适应正交多载波频分复用(AOFDM)中根据估计出的信道特性选择调制方式的问题。文中给出了AOFDM中的平均每个子载波上一个符号能传送的比特数及误比特率与调制方式切换门限之间的函数关系式。并根据不同的优化目标给出了最优化的切换门限的求解方法。并以一个特定的信道为例演示了该方法的具体用法,给出了数值分析结果。The problem of how to choose the constellation size based on the estimated channel qualities in AOFDM systems is addressed in this paper. The close forms of the number of bits that per-sub-carrier-symbol can transmit and the Bit-Error-Probability (BER) are given as the functions of the switching thresholds. The approach to obtain the optimized switching thresholds subjected to different constraints is also given. The proposed method is validated by the simulation results with a specific channel.

关 键 词：自适应正交多载波频分复用 切换门限 优化 

分 类 号：TN914.3[电子电信—通信与信息系统]