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为了减少直接检测的光正交频分复用(DD-OOFDM)传输系统中色散对系统的影响,传输系统使用了基于频域的最小均方(LMS)自适应均衡技术,由于基于频域的LMS估计方法计算复杂度低且便于信号块处理,相比最小平方(LS)估计方法,可更有效地追踪信道变化,减小相位噪声对传输系统的影响。实验结果表明,经背靠背(BTB)和100km标准单模光纤(SSMF)传输后,使用频域LMS估计方法的信号比使用频域LS估计方法的信号系统接收功率代价在误码率为10×10-2.5和10×10-2.0时分别降低了2dB及2.5dB,频域LMS估计方法比频域LS估计方法对传输系统具有更好的色散补偿效果。
In order to reduce the impact of dispersion on the system in the directly detected Orthogonal Frequency Division Multiplexing (DD-OOFDM) transmission system, the transmission system uses a frequency domain based least mean square (LMS) adaptive equalization technique. Since the frequency domain Compared with LS estimation method, LMS estimation method can reduce the computational complexity and facilitate the processing of signal blocks, and can effectively track the channel changes and reduce the impact of phase noise on the transmission system. The experimental results show that the signal received by LMS estimation method using frequency-domain LMS is more efficient than the signal system using LS estimation method when transmitted by back-to-back (BTB) and 100km standard single-mode fiber (SSMF) -2.5 and 10 × 10-2.0 respectively, the frequency domain LMS estimation method has better dispersion compensation effect than the frequency domain LS estimation method on the transmission system.