EVM-95:th percentile意义为何？

指的是8PSK的的指标，是说在所有测试的EVM分布，EVM值从小到大排列，排列到第95％的那个sysbom的EVM的值要小于15％，（The measured 95th-percentile value shall be < 15 %，The measured peak EVM values shall be < 30 %，the measured RMS EVM over the useful part of any burst, excluding tail bits, shall not exceed：for MS:        under normal conditions  9,0 %        under extreme conditions 10,0 %
）
可以参考3GPP TS 05.05关于EVM的部分，讲的很清楚。

EVM 95%置信度测试:具体解释如下:(至于仪器是如何实现该项测量的,你可以问问RS,Agilent的人,射频工程师只需要关注指标是否OK就行了)
The maximum acceptable uncertainty of the Test System is specified below for each test, where appropriate. The Test
System shall enable the stimulus signals in the test case to be adjusted to within the specified range, and the equipment
under test to be measured with an uncertainty not exceeding the specified values. All ranges and uncertainties are
absolute values, and are valid for a confidence level of 95 %, unless otherwise stated.
A confidence level of 95 % is the measurement uncertainty tolerance interval for a specific measurement that contains
95 % of the performance of a population of test equipment.
For RF tests it should be noted that the uncertainties in clause F.1 apply to the Test System operating into a nominal 50
ohm load and do not include system effects due to mismatch between the DUT and the Test System.

understand  but not so clearly ,  maybe it's a tolerrance for the uncertainty of mearsurement .
ecpect some ones give a  much clearly explaination