便携式TDD-LTE矢量信号发生器的研制

Design and implementation of portable TDD-LTE vector signal generator

基于3Gpp长期演进(long term evolution,LTE)下行无线帧结构和相关物理层信号标准,研制了便携式TDD-LTE矢量信号发生器。详细介绍了信号发生器的硬件设计与软件架构。该设备采用了数据预存储方案,用专门设计的软件程序生成不同配置的TDD-LTE下行无线帧数据,并存储到FLASH存储器中,然后把某一帧数据用模数转化器生成模拟信号,最后通过射频模块把生成的模拟信号发射出去。用安捷伦89600矢量信号分析软件结合矢量分析仪对研制的矢量信号发生器进行了测试,测试结果表明该矢量信号发生器产生的无线信号可以被正确解调,且其误差矢量幅度小于3%,完全符合TDD-LTE协议规范。该设备可为TDD-LTE建网前的小区规划测试提供模拟的TDD-LTE基站下行无线信号。

Based on the Long Term Evolution（LTE） downlink frame structure,a portable TDD-LTE vector signal generator used in cell planning is designed.The data pre-storage scheme is adopted in this vector signal generator.TDD-LTE downlink radio frames with different configuration options are generated by a designed special program and loaded into a flash,one frame data is then converted to analog signals and transmitted by a radio frequency module.Both hardware design and software architecture are presented.The TDD-LTE vector signal generator was fabricated and meas-ured using the 89600 software of Agilent.The measurement results show that the transmitted signal generated by this vec-tor signal generator can be correctly demodulated and the Error Vector Magnitude（EVM） is less than 3%,which meets the requirement of LTE technical specification.So,this device can effectively simulate the downlink signal from base-station in TDD-LTE cell planning.