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Ansoft Designer / Ansys Designer 在线帮助文档：

System Simulator >
System Component Models >
Probes >
Error Vector Magnitude Probe (EVMP)

Error Vector Magnitude Probe (EVMP)

Property	Description	Units	Default	Range/Type
Name	Probe name	None	Required	String
Initsamp1	Number of samples removed from input1 waveform	None	0	[0, Inf)/Integer
Initsamp2	Number of samples removed from input2 waveform	None	0	[0, Inf)/Integer
Initsamp3	Number of samples removed from input3 waveform	None	0	[0, Inf)/Integer
Initsamp4	Number of samples removed from input4 waveform	None	0	[0, Inf)/Integer
RIN1	Input1 impedance	Ohm	Inf	[0, Inf)/Real
RIN2	Input2 impedance	Ohm	Inf	[0, Inf)/Real
RIN3	Input3 impedance	Ohm	Inf	[0, Inf)/Real
RIN4	Input4 impedance	Ohm	Inf	[0, Inf)/Real
Ports
Input1	Received in-phase signal (real)
Input2	Received quadrature signal (real)
Input3	Reference in-phase signal (real)
Input4	Reference quadrature signal (real)

Notes

1. This probe calculates the error vector magnitude of a measured signal vector and an ideal (reference) signal vector (see the diagram).

Expressed using vector representation, the error vector magnitude (EVM) is simply:

|| = ||

The assumption here is that there is no constant offset between the measured and ideal signals. That is, both vectors have a common origin. In here, the measured and referenced signals will invariably have different peak levels due to attenuation, distortion,.. etc.
Consequently, the magnitudes for A and B need to be normalized, in our case, to the peak reference magnitude. For N input samples, the EVM reported by this probe is given by:

Netlist Form

EVMP:NAME n1 n2 n3 n4 [Initsamp1=val] [Initsamp2=val] [Initsamp3=val] [Initsamp4=val] [Rin1=val] Rin2=val] Rin3=val] Rin4=val]

Netlist Example

EVMP:1 1 2 3 4

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