基于软件无线电平台的分布式天线系统实现  

Implementation of Distributed Antenna System with Software-Defined Radio

作　　者：罗加兴 陈为刚[1,2] 杨晋生 LUO Jia-xing;CHEN Wei-gang;YANG Jin-sheng(School of Microelectronics,Tianjin University,Tianjin 300072,China;Joint Laboratory for Ocean Observation and Detection,Qingdao National Laboratory.for Marine Science and Technology,Qingdao 266200,Shandong Province,China)

机构地区：[1]天津大学做电子学院,天津300072 [2]青岛海洋科学与技术国家实验室海洋观测与探测联合实验室,青岛266200

出　　处：《应用科学学报》2018年第6期894-903,共10页Journal of Applied Sciences

基　　金：天津市科技兴海项目基金(No.KJXH2011-2);青岛海洋科学与技术国家实验室主任基金(No.QNLM-201712)资助

摘　　要：为了有效利用空间分集对抗多径传播造成的衰落,设计并实现了基于软件无线电平台的分布式天线系统.与传统的方案相比,该系统将各个前端接收到的数据汇聚到另外一台计算机上处理,实现了各个不同的计算机运算量的均衡,适合软件无线电架构.具体而言,以4台计算机与通用软件无线电外设(universal software radio peripheral,USRP)组成的软件无线电平台作为4个不同位置上的内接收机,然后通过交换机与另外一台计算机相连接,该计算机作为外接收机完成译码等操作.此外,利用传输参数信令的空闲比特承载超帧编号,实现内接收机和外接收机之间的同步.该方案实现了内接收机和外接收机的分布式处理,不仅可以实现空间分集,还可以实现运算的均衡,具有较好的实用性与扩展性.在无线场景下的测试结果表明,与单独一台接收机相比,所设计的分布式天线系统能获得一定的分集效果,并改善了系统整体性能.To utilize the spatial diversity effectively for combating the fading caused by the multipath propagation, a distributed antenna system based on a software-defined radio platform is designed and implemented. Compared with traditional schemes, the system converges the data received by each front-end to another computer, which can equalize the computation load among different computers and is suitable for the software-defined radio architecture. Specifically, software-defined radio platforms consisting of four computers and universal software radio peripherals （USRP） are used as inner receivers at different positions. In this paper, through a switch, the four inner receivers are connected to an extra computer which is used as an outer receiver for signal decoding and other operations. Besides, superframe number is delivered in the idle bits of transport parameter signaling to achieve the synchronization between inner receivers and outer receiver. The scheme achieves distribution processing of inner receivers and the outer receiver with the capability of realizing the space diversity and the computing balance, accordingly, performing good practicability and expansibility. The test results in the practical wireless scenario show that the distributed antenna system can achieve the spatial diversity and improve the overall performance compared with a single receiver.

关 键 词：软件无线电 分布式天线系统 空间分集 

分 类 号：TN92[电子电信—通信与信息系统]