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

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.