基于WiMAX的数字射频光纤传输仿真与分析

摘要

基于WiMAX标准下射频数字光纤传输(DRoF)仿真模型，建立了输入信号、ADC采样/保持/量化、光纤传输、检测判决以及DAC零阶保持、解调输出等环节的数学模型，实现了WiMAX信号通过DRoF链路传输的全过程。就ADC分辨率、ADC和DAC时钟抖动噪声以及光纤噪声等单因素对系统性能影响机理进行了仿真实验，分析了WiMAX信号传输条件下的比特率对误码率、误差矢量幅值等性能指标影响。所得结论为下一步研究和优化DRoF链路提供了理论分析依据。%Based on the simulation model of digital RF transmission over optical fiber (DRoF) at the standard of WiMAX, this paper establishes a math model for the links of input signals, ADC sampling, holding and quantizing, transmitting over the optical fiber, detection and making decision as well as DAC zero-order holding, demodulation output and etc., and implements the whole process of WiMAX signals transmission over the links of DRoF. The impacts mechanism of ADC resolution, ADC and DAC clock jitter noise, optical noise and other single-factors on the system performance are experimented by simulation, and the influences of the bit rate in the condition of WiMAX signal transmission on the error rate, error vector amplitude and other performance indices are also analyzed in this paper. The conclusion drawn can provide the theoretic analysis basis for the study and optimization of DRoF links.