摘要
针对相位噪声对光相移键控传输系统性能影响的问题,目前广泛采用滤波器进行相位估计,针对滤波器的边界效应及高精度与延时存在矛盾的问题,文中将小波变换与前向反馈技术结合用以实现相位恢复,既避免了滤波器的边界效应及延时,同时又实现了高精度的相位恢复。仿真结果显示,该算法可消除4 MHz的激光器线宽和35°激光器相位偏差对系统误码率的影响,且更适用于高速相干光通信系统实现的实时并行处理。
In optical M-ary phase shift keying （MPSK） transmission systems, phase noise affects system per- formance seriously. Filters are widely used as a phase estimating method currently, which has boundary effect and trade-off between high accuracy and lag. A novel feedforward phase estimation method with wavelet transform is pro- posed to avoid these effects. The simulation results show that the new method can eliminate bit error rate （BER） de- teriorating due to 4 MHz laser linewidth or 35° laser phase offset, and is more suitable for high speed coherent optical communication systems to achieve parallel processing.
出处
《电子科技》
2014年第12期92-95,共4页
Electronic Science and Technology
关键词
光通信
相干接收
信号处理
小波变换
相位估计
optical communication
coherent receiver
signal processing
wavelet transform
phase estima-ting
