基于新型小波变换的通信系统的研究

Research on digital communication system based on discrete wavelet transform

为提高多载波通信传输系统的频谱利用率,节约频谱资源,提出了一种新的基于离散小波变换的尺度因子的多载波通信系统.与传统的离散小波基的尺度因子为2的整数倍不同,该方法中的尺度因子为整数的倒数,因此该系统的子载波不是一组正交载波,而是将每一个子载波在频域上进行等频分配,每一个等频间隙传送一个数据符号.通过对新系统进行仿真,结果表明虽然新系统在误码率性能上低于OFDM系统,但是其频带利用率优于OFDM系统的频带利用率.

To improve the bandwidth efficiency in multicarrier transition system, we propose a novel digital communation system based on discrete wavelet transform method. The scale parameters of the wavelet base are discreted as reciprocals of integers,rather than integer of 2 in convetional system, thus the sub-carrier is not a set of quadraturecarriers, but divided with equal intervals in frequency axis, and transmit a signal at each interval. The Matlab simulation results show that the proposed method is superior in bandwidth efficiency,though inferior in BER performance to OFDM system.