论文部分内容阅读
正交频分复用(OFDM)技术加相干接收与数字信号处理法(DSP)的组合是超长距离光通信的理想模型。光OFDM系统对相位噪声十分敏感,必须对相位噪声进行补偿。提出一种基于正交小波基变换的光OFDM系统的联合相位均衡方案。该方案将块状导频周期性地插入OFDM信号,在接收端利用导频信息首先消除各个子载波的公共相位误差,然后采用自适应均衡方式消除每个子载波自身相位误差。仿真结果表明,对于二进制正交振幅键控(4QAM)调制信号,在采用常规的G.652光纤、100Gb/s的相干光OFDM系统中,该联合相位补偿方法可使信号在满足传输系统的误码性能要求下,传输距离达到1000km。
The combination of Orthogonal Frequency Division Multiplexing (OFDM) technology plus coherent reception and digital signal processing (DSP) is an ideal model for long-haul optical communications. Optical OFDM systems are very sensitive to phase noise and must compensate for phase noise. A joint phase equalization scheme based on Orthogonal Wavelet Transform for optical OFDM systems is proposed. In this scheme, the block-like pilot is periodically inserted into the OFDM signal. At the receiving end, the pilot information is used to eliminate the common phase error of each sub-carrier first, and then the self-adaptive equalization method is used to eliminate the phase error of each sub-carrier. The simulation results show that in the case of the conventional quadrature amplitude-shift keying (4QAM) modulated signal, the joint phase compensation method can make the signal meet the requirements of the transmission system in the conventional G.652 optical fiber and 100Gb / s coherent optical OFDM system Code performance requirements, the transmission distance up to 1000km.