在分析光载无线电上行链路模型基础上,将其简化为Wiener模型.光链路的非线性失真以及无线信道的多径衰落严重影响接收信号的性能,为改善系统性能,接收端采用Hammerstein类均衡器对信号进行均衡.首先多项式滤波器补偿光纤信道的非线性失真,减少互调干扰,然后判决反馈结构的均衡器补偿无线信道的响应减少码间干扰.仿真结果验证了本算法的有效性.
Model of radio over fiber(RoF) uplink was simplified to a Wiener model to model the system.The performance of the received signal was severely degraded by nonlinear distortion of the fiber link and linear distortion due to wireless channel multipath fading.The Hammerstein type equalizer was introduced in the receiver in order to improve the system performance.The nonlinear distortion was compensated by the polynomal filter first,reducing the power of cross modulation products.Then the wireless channel response was compensated by decision feedback equalizer(DFE), reducing the inter-symbol interference. The effectiveness of the proposed algorithm was demonstrated by simulation.