自适应调制技术在OFDM系统中的应用

摘要

The adaptive modulation and demodulation based on OFDM system can allocate bits andpower according to the results of the estimating of channels, and it can choose the way of modulationadaptively in order to fully utilize the frequency resource and the whole system' s performance. The paperintroduced a mainstream algorithm on adaptive modulation, presents a simulation on this system and gets aBER map. The experiment showed directly the difference between the adaptive modulation and the fixedmodulation.%基于OFDM系统的自适应调制与解调根据信道估计的结果进行比特和功率的分配,进而自适应的选择相应的调制方式,能够最大限度的提高频谱利用率和系统的整体性能.介绍一种主流的自适应调制算法,并进行了系统仿真,得到误码率曲线图,比较直观的对比出采用自适应调制和固定调制方法的优劣.