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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。
Based on the analysis of the composition and downlink transmission model of ROF (Radio Over Fiber) system, an identification algorithm for the downlink model of ROF system is proposed. The ROF downlink consists of a nonlinear memoryless optical fiber link and a time-varying linear multipath wireless channel. The ROF system is identified through the adoption of the distorted signal output by the ROF system to identify the transmission function of the wireless channel. Finally, the model parameters of the nonlinear link of the ROF system are estimated from the input signals of the system and the reconstructed intermediate signals. Simulation results show the effectiveness of the proposed algorithm in identifying downlink model of ROF system.