面向TD-LTE网络的塔顶放大器控制单元设计

Control Unit Design of Tower Mounted Amplifier for TD-LTE Networks

根据TD-LTE网络时分复用工作方式对塔顶放大器(TMA)的通信和控制性能要求,提出了一种符合天线接口标准组(AISG)协议的控制单元设计方案。利用环行器和大功率射频开关构建了射频收发模块,显著提高了上下行通道间的隔离度并有效避免了闭环自激。采用基于对数放大器的检波方法实现了解调灵敏度可调节的OOK通信电路。提出上行时隙内进行同步工作电流检测的TMA状态检测和故障处理方法,改善了其故障检测与恢复的效率。测试结果表明,设计方案符合AISG协议规范要求,状态监控功能完善,告警上报方式合理,且具备非永久故障下自动恢复的功能。

According to the communication and control performance requirement of Time Division LongTerm Evolution （TD-LTE） network＇s Time Division Duplex（TDD） work mode for tower mounted ampli-fier （TMA）,a controller design scheme is provided which conforms to Antenna Interface Standard Group（AISG） protocol. Circulator and high power radio frequency（RF） switch are jointly employed to build thetransceiver module,which improves the isolation between uplink and downlink and also avoids the closedloop self-excitation. A demodulation method based on logarithmic amplifier is used to realize the OOKcommunication circuit with adjustable demodulation sensitivity. TMA state detection and fault handlingmethods are designed through synchronous measurement of its working current during uplink slot to improvethe efficiency of fault exploration and recovery. Test results show that the presented design scheme primelymeets the requirement of AISG protocol,the state monitoring function is perfect,alarm raising way is reson-able,and it also features auto-recovery function under non- permanent failure.