摘要
在阐述和构造了正交频分复用(OFDM)水声通信系统的基础上,利用小波包分解与重构对OFDM水声通信系统进行语音信号消噪处理。小波包分解方法依据信号与噪声小波变换系数分布特性不同来进行,首先将语音信号分层,确定最佳小波包分解树,再进行阈值量化,完成小波包分解,并对所得阈值进行消噪处理,最后利用小波包逆变换重构传输信号。计算机仿真结果表明在OFDM水声通信系统中利用小波包分解方法对语音信号进行处理,可有效消噪,并可较为完整地保存有效信号。
Based on the OFDM-based sonar communication system,it decompposes and reconforms the wavelet bag to eliminate the noise for OFDM-based sonar communication speech signal.This method realizes the various process according to the noise wavelet commutation coefficient distribution,defines the speech signal as some layers,confirms wavelet bag tree,makes the quantitative change,re-establishes the transmission signal with converse wavelet commutation.The simulation shows that the signal quality is good.
基金
湖北省武汉市科技攻关项目(201010621212)
关键词
水声通信
小波包
OFDM
消噪
Sonar Communication
Wavelet Bag
OFDM
Elimination Noise
