基于输出信号过采样的RoF下行链路辨识

ROF System Identification Based on Output Signal Over-sampling

在分析ROF(Radioover Fiber)系统的组成与下行传输模型的基础上,提出了一种对ROF系统下行链路模型的辨识算法。ROF下行链路由非线性无记忆的光纤链路和一个时变的线性多径无线信道组成,通过对ROF系统输出的失真信号进行过采用,从而辨识出无线信道的传输函数,重构ROF系统的中间信号,最后由系统的输入信号和重构的中间信号估计出ROF系统非线性链路的模型参数。通过仿真分析表明,该算法对ROF系统下行链路模型辨识的有效性。

In the light of analysis on configuration and downlink model of the radio over fiber （ROF） system, a identification algorithm is proposed based on over-sampling the output of the ROF system. The ROF downlink is composed of a nonlinear memoryless ROF link and a dynamic linear multipath wireless channel. Firstly, the transfer function identification of the linear part can be achieved based only on the output measurements. Secondly, the internal signal is restored by using the identified wireless channel model. Finally, the nonlinear parameter of ROF system is identified by using the input signal and reconstructed internal signal. The effectiveness of the proposed algorithm is proved by simulation.