时变带限信道中光通信的均衡与去噪技术

为了解决时变带限信道中的光通信问题,基于自适应均衡和盲均衡方法,提出了一种半盲光信号均衡方案,适用于大气海洋等时变带限光信道的光通信信号处理.对带限光信道中传输的包含泊松噪音开关键控调制光脉冲信号的不同数字均衡处理方法进行了数值模拟,比较了不同方法的结果,证明半盲均衡能更快匹配光信道且能保持收敛.同时,利用小波方法研究了含噪光接收信号去噪问题,发现光滑小波软阈值去噪方法更适合空间光脉冲信号波形,并对通信眼图进行了去噪的数值模拟.

Equalization and De-noise Techniques for Optical Communication in Time-varied Band-limited Channel

A semi-blind equalization method is proposed based on combination of adaptive and blind equalization techniques,which is more effective for optical signal processing in time-varied band-limited channel.The numerical simulation of Poisson noise OOK optical pulse signal in a band-limited channel using digital equalization techniques is performed,and the results are compared.The semi-blind equalization matchs the channel faster and sustains convergence were identified.In addition,the wavelet de-noise technique is introduced in the de-nosing area of optical signa process.The criteria of choosing wavelet basises is obtained that smooth wavelet soft threshold method is better.The corresponding numerical simulation is also conducted.