OFDM-RoF原理与关键技术

Principles and Key Technologies of OFDM-RoF

光通信与无线通信的融合是未来通信的发展方向。正交频分复用(OFDM)技术即将成为下一代无线通信的物理层核心技术。OFDM光载无线(OFDM-RoF)接合了无线通信和光通信的优点,具有高速率、高容量、高频谱利用率的优势。OFDM-RoF系统有光纤色散、光纤非线性、调制非线性等问题,可以利用峰值平均功率比(PAPR)降低算法降低光纤非线性、调制非线性;利用循环前缀、信道估计消除色散影响;利用数字相位共轭、偏载波填充、非线性预补偿、降低序列相关性降低光纤非线性。

There is a tendency that the future communication networks will be the integration of optical communications and wireless communications. Orthogonal Frequency Division Multiplexing （OFDM） will be the core physical layer technology for the next generation wireless communications. The OFDM-Radio over Fiber （OFDM-RoF） technology, which features high speed, huge capacity, high spectrum efficiency, combines the advantages of optical and wireless communications. There are problems such as fiber dispersion, fiber nonlinearity and modulation nonlinearity in OFDM-RoF systems. Finally the solutions to the drawbacks are given respectively, such as fiber nonlinearity and modulation nonlinearity mitigation by Peak to Average Power Ratio （PAPR） reduction algorithms, dispersion elimination by cycle prefix insertion and channel estimation, fiber nonlinearity mitigation by digital phase conjugation, partial carrier filling, nonlinear pre-distortion and serial correlation reduction.