采用信道估计法的基站VSWR实时检测

为解决无线基站宽带工作频带内电压驻波比(Voltage Standing Wave Ratio,VSWR)的实时测量，提出了一种采用信道估计法的测量方案。该方案实现简单，在基带处理单元高速率位置发送数据，依次抓取射频通道反馈和反射数据，分别求取信道响应序列，结合工厂装备测试数据，计算驻波反射系数和反射点位置。发送信号采用宽带正交频分复用信号，能检测到工作频段内任何频点处的驻波异常。有用信号前加循环前缀，并引入峰值抵消核，能正确检测到多个反射点驻波。仿真结果表明，该方案驻波测量精度和单回波点位置精度达到预期，多回波点测量能抓准外部主要故障点，在基站VSWR实时测量中具有良好的应用前景。

Real-time detection of radio base station VSWR using channel estimation method

In order to solve the real-time measurement of voltage standing wave ratio(VSWR) in broadband operating band of radio base station,a measurement scheme using channel estimation method is proposed.The implementation of the scheme is simple.The data from high-speed rate positions of the baseband processing unit is sent,the feedback and reflected data of the radio frequency channel are captured in turn,and the channel response sequence is obtained respectively.The reflection coefficient and the reflection point position of the standing wave are calculated by combining the equipment test data of the factory.The transmitted signal is wideband orthogonal frequency division multiplexing(OFDM) signal and can detect the standing wave anomaly at any frequency point in the working frequency band.A cyclic prefix is added before the useful signal is introduced,and the peak offset core is introduced to correctly detect multiple reflected point standing waves.The simulation results show that the accuracy of standing wave measurement and the location accuracy of single echo point are expected.The multi-echo point measurement can grasp the main external fault points.It has good application prospects in real-time measurement of base station VSWR.