EVM测试中匹配滤波器的选择方法研究

针对部分被测设备数字调制输出时滤波器未知或者采用非常规滤波器的情况,在深入分析匹配滤波器与误码率、EVM之间关系的基础上,提出在测量仪器上使用“遍历法”寻找使得EVM测量准确度最高的测量滤波器的工程近似方法。实验表明该方法实用有效,当测量仪器中存在匹配滤波器,寻找到匹配滤波器的概率为100%,当测量仪器中不存在匹配滤波器,遍历法能够找出在有限条件下使测量结果最佳的测量滤波器。

Research on Method of Selecting the Matched Filter in EVM Measurement

Based on the relationship between matched filter and BER and EVM, using “traversal method”,an engineering approximation method is proposed to search the best measuring filter, which making the EVM measurement in better accuracy for cases of unawareness of filter configuration or specialized filter in equipment under testing. Experiments show that the method is practical and effective. When there is a matched filter in the measuring instrument, the probability of finding the matching filter is 100%. When there is no matching filter in the measuring instrument, the “traversal method” can find the best measurement filter under limited conditions.