摘要
EVM(误差矢量幅度)是移动通信系统终端测试指标的重要内容,它与其它常规指标(如眼图或BER测量)相比能更直观快速地反映信号的质量,已成为目前终端测试的研究热点。在传输过程中,由于信号受到噪声等因素的影响,会造成EVM测量值不准的问题。因此,基于3GPP标准,设计并实现了一种LTE下行链路EVM测量算法。本算法利用插值、查找最优测量位置和频偏补偿等处理,使最终的EVM测量值更接近真实值。算法测试结果表明,本算法的测量结果较为准确,测量时间较短,具有实际应用意义。
EVM is one of the important mobile communication terminal test metrics,and it can provide an insight into the signal＇s quality that other performance measurement such as the eye diagram or BER measurements do not cover,which has become a hotspot in relative field. However,the received signal will be impacted by noise during transmission,which will lead to inaccuracy of EVM measurement. Therefore,a measurement algorithm of EVM for LTE downlink based on 3GPP standards is proposed and implemented.This measurement algorithm includes interpolation,finding the optimal measurement position and frequency-offset compensation,which can improve the accuracy of EVM measurement. Test results indicate that the algorithm offers more correct calculation of the EVM and relatively lower time-consumption. Thus,it has a practical value.
出处
《通信技术》
2014年第7期718-723,共6页
Communications Technology
基金
国家科技重大专项(No.2012ZX03001033)
国家自然科学基金资助项目(No.61331009)~~
