多信道数字与模拟RoF系统性能比较

摘要

In this article,a comprehensively comparision is made between multichannel digital RoF and analog RoF transmission scheme and their performances,and it has been discussed about how to realize the frequency conversion only with a single ADC or DAC under the theory of bandpass sampling.Then to simulate and to comprehensively make comparision about the nonlinearity products,and the result was simulated by OptiSystem.Both theory and experiment suggest a better performance and cost-effective in digital RoF link,especially for long-haul fiber radio networks.%综合比较多信道数字RoF和模拟RoF的传输系统方案和性能,并分析数字RoF如何利用带通采样的特点实现只需要用ADC和DAC就可以完成频率迁移.推导和分析多信道模拟RoF与数字RoF受到的非线性影响,并通过Optisystem进行仿真.理论和仿真都证明DRoF链路比模拟RoF链路有着更好的SNR性能和动态范围,更适合远距离传输.