DMB单频网及适配器电路的设计与实现  

Design and Implementation of SFN and Adapter Circuit of DMB

作　　者：张红升[1] 张国栋 王虹云 王国裕[1] ZHANC Hongsheng;ZHANG Guodong;WANG Hongyun;WANG Guoyu(Key Lab of Microelectronics Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学微电子工程重点实验室,重庆400065

出　　处：《重庆理工大学学报（自然科学）》2021年第6期185-194,共10页Journal of Chongqing University of Technology：Natural Science

基　　金：重庆市技术创新与应用发展专项项目(cstc2019jscx-msxmX0079;cstc2020jscx-gksbX0012)。

摘　　要：针对目前数字多媒体广播(digital multimedia broadcasting,DMB)单频网组网成本高、系统复杂的问题,提出了一种使用局域网传输数据,利用全球定位系统(global positioning system,GPS)校准DMB发射机的发射时间和系统频率、并可用于小区和校园等小型DMB系统的低成本单频网实现方法。在发射机中增加单频网适配器模块,利用GPS的秒脉冲信号实时校准本振时钟,通过传输帧缓冲机制,在普通局域网内能使多路发射机的基带信号实现比特同步,降低了DMB单频网的实现成本。测试结果表明:IQ基带信号同步误差小于0.1μs,发射机之间的频率偏差约为0.1 Hz,DMB信号同步误差小于0.5μs。在约500000 m^(2)的校园内进行了DMB小功率单频网的测试,证明该方法适用于学校、景区、社区等对成本敏感的场景。A low cost design method is proposed in order to solve the problem of high cost and complicated system of digital multimedia broadcasting single frequency network.The method uses a local area network as the signal transmission network and uses global positioning system signals as the time and frequency reference source.The method enables DMB transmission frames to achieve bit synchronization in the local area network by adding a SFN synchronization control module using the PPS signal of GPS to calibrate the local clock in real time and buffering data,reducing the cost of the SFN.The experimental results show that synchronization error of DMB signal is less than 0.5μs,signal frequency deviation between transmitters is less than 0.1 Hz and the bit synchronization error of the DMB base-band signal is less than 0.1μs.The test of the DMB low-power SFN on a campus of about 500000 square meters proves that the method is suitable for low-cost locations such as schools,scenic spots,and communities.

关 键 词：数字多媒体广播 单频网 局域网 全球定位系统 

分 类 号：TN919.8[电子电信—通信与信息系统]