LTE Magnitude Error

seashell

MTK 的LTE NSFT测试报告里有一项Magnitude Error，

EVM (%rms), 1.550, MAX, 17.500000, MIN, 0.000000, PASS
Magnitude Error (%), 1.140, MAX, 10.000000, MIN, 0.000000, PASS
IQ Offset (dB), -50.900, MAX, -20.000000, MIN, -100.000000, PASS
Frequency Error(ppm), -0.006, MAX, 0.100000, MIN, -0.100000, PASS

这一项对应LTE 规范里的哪一项呢？

Maximum Power Reduction(MPR)
Additonal Maximum Power Reduction(A-MPR)
ON OFF Time Mask
General ON OFF Time Mask
PRACH and SRS Time Mask
PRACH Time Mask
SRS Time Mask
Power Control
Power Control Absolute Power Tolerance
Power Control Relative Power Tolerance
Aggregate Power Control Tolerance
Error Vector Magnitude(EVM)
Error Vector Magnitude(EVM) PUSCH
Error Vector Magnitude(EVM) PUCCH
Error Vector Magnitude(EVM) PRACH
Error Vector Magnitude(EVM) Exclusion Period
Carrier Leakage
In-Band Emissions for Non-Allocated RB
In-Band Emissions PUSCH
In-Band Emissions PUCCH
EVM Equalizer Spectrum Flatness
Occupied Bandwidth(OBW)
Spectrum Emission Mask(SEM)
Additional Spectrum Emission Mask
Adjacent Channel Leakage Ratio(ACLR)
Spurious Emissions
Transmitter Spurious Emissions
Spurious Emission Band UE co-existence
Additional Spurious Emissions
Transmit Intermodulation
Reference Sensitivity Level
Maximum Input Level
Adjacent Channel Selectivity(ACS)
Blocking Characteristics
In-Band Blocking
Out-of-Band Blocking
Narrow Band Blocking
Spurious Response
Wide Band Intermodulation
Spurious Emissions(Rx)

hanny

没这个指标

wangkuna186

学习学习

gook2009

看下EVM概念吧。 EVM不就分为幅度误差和向量误差吗，测试时会把三个都显示出来，协议上只是合成EVM一个指标了。

seashell

gook2009 发表于 2015-8-10 09:52
看下EVM概念吧。 EVM不就分为幅度误差和向量误差吗，测试时会把三个都显示出来，协议上只是合成EVM一个指标 ...

多谢！Magnitude Error 也是EVM了。

gook2009

seashell 发表于 2015-8-11 15:37
多谢！Magnitude Error 也是EVM了。

不是EVM呵， ME跟PE 向量出一个指标就是EVM