【摘要】 提出一种DTMB接收机抗单频网回波干扰性能实验室测试方法。首先,测量系统工作模式下的射频保护率PR、0 d B回波最大延时dmax以及延时超过dmax时回波幅度最小衰减量Dmin,然后根据射频保护率PR定义计算出延时超过dmax时有用信号功率所占回波总功率的百分比。并基于理论六边形单频网模型研究了固定接收和移动接收下DTMB接收机抗单频网回波干扰性能在不同FFT窗口同步方法下对单频网覆盖地点概率估计的影响,仿真结果表明接收机特性对单频网覆盖率有重要影响。更多还原

【Abstract】 A method based on laboratory SFN simulation tests for DTMB receiver performance measurement with SFN echo is proposed.Firstly,protection ratio( PR),the maximum delay dmaxfor 0 d B echo and the minimum amplitude attenuation Dminfor echo with delay larger than dmaxare measured for a given transmission mode.Secondly,the ratio between the useful contribution and the total power is calculated according to the formula of PR definition.The effects of DTMB receiver characteristics,including the interfering model and FFT window synchronization methods,on coverage location probability are studied based on the theoretical hexagon model for mobile and fixed reception.The results show that the receiver characteristics have a relevant impact on the final coverage percents within the service area.更多还原