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光纤无线电技术是近年发展起来的一种新兴宽带传输技术,满足日益增长的用户带宽需求和灵活的移动接入。然而,由于电光转换的非线性失真和无线信道的多径衰落,接收信号会受到干扰的影响而恶化,因而需要采用均衡技术对信道响应进行补偿。文中将上行信道等效为Wiener模型,接收端均衡器首先补偿光纤信道的非线性失真,减少交扰调制失真,然后采用判决反馈结构的均衡器对无线信道的响应进行补偿减少码间干扰。仿真结果验证了该方法的有效性。
Optical fiber radio technology is an emerging broadband transmission technology developed in recent years to meet the increasing demand for user bandwidth and flexible mobile access. However, due to the nonlinear distortion of the electro-optical conversion and the multipath fading of the wireless channel, the received signal is deteriorated by the interference, and hence an equalization technique is needed to compensate the channel response. In this paper, the uplink channel is equivalent to the Wiener model. The receiver equalizer first compensates the nonlinear distortion of the fiber channel to reduce the crosstalk modulation distortion. Then, the equalizer of the decision feedback structure is used to compensate the response of the wireless channel to reduce intersymbol interference. Simulation results verify the effectiveness of this method.