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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。
The EVM (Error Vector Magnitude) is an important part of the terminal test index of the mobile communication system. It can reflect the signal quality more directly and quickly than other conventional indicators (such as eye diagram or BER measurement) and has become a hotspot in the field of terminal testing . In the transmission process, the signal is affected by noise and other factors, will cause the EVM measurement value is not allowed. Therefore, based on the 3GPP standard, an LTE downlink EVM measurement algorithm is designed and implemented. The algorithm uses interpolation, find the optimal measurement position and frequency offset compensation and other processing, so that the final EVM measurements closer to the true value. The algorithm test results show that the proposed algorithm has more accurate measurement results and shorter measurement time, which has practical significance.