绍了OFDM技术的基本原理及系统实现，并分析了OFDM系统的优缺点；接着论述了自适应比特功率分配算法的原理和步骤，同时还着重介绍了注水算法，并对该算法进行了实验仿真，进一步论证了该算法是最优的功率分配算法-This thesis introduces the basic principle and implementation of the OFDM system firstly, and analyzes the advantages and disadvantages of the OFDM system. Then the thesis discusses the principle and steps of the adaptive bit power allocation algorithm.