DTMB接收机对单频网覆盖地点概率估计的影响研究  

Research on Impact of DTMB Receiver Characteristics on SFN Coverage Location Probability

作　　者：李彩伟[1] 张晓林[1] 张展[1] 李铀[1] 李辰[1] 于志坚[2] 

机构地区：[1]北京航空航天大学电子信息工程学院国家数字电视工程重点实验室,北京100191 [2]北京跟踪与通信技术研究所,北京100094

出　　处：《电视技术》2015年第11期83-88,共6页Video Engineering

基　　金：北京市重点学科基金项目(XK100070525)

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。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 dmax for 0 dB echo and the minimum amplitude attenuation Dmin for echo with delay larger than dmax are 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.

关 键 词：DTMB 单频网 网络规划 地点概率 

分 类 号：TN949.197[电子电信—信号与信息处理]