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Ansoft Designer / Ansys Designer 在线帮助文档：

System Simulator >
System Component Models >
Demodulators >
   QAM Demodulator (QAMDEM)       

QAM Demodulator (QAMDEM)

 


Property

Description

Units

Default

Range/Type

M

Order of constellation space

None

4

(0, Inf)/Integer

RIN1

Input1 impedance

Ohm

Inf

(0, Inf]/Real

RIN2

Input2 impedance

Ohm

Inf

(0, Inf]/Real

ROUT

Output impedance

Ohm

0

[0, Inf)/Real

Ports

Input1

Input1 signal (real)

Input2

Input2 signal (real)

Output

Output signal (real)

 

Notes

1. This model outputs N bits for each incoming in-phase and quadrature input samples, where
and
M is the order of the constellation space (i.e. M=4 for 4-QAM and M=16 for 16-QAM …)

For a given M, this model determines the constellation point (in the I ¾ Q signal space) with the minimum metric distance to a given complex (in-phase and quadrature) input sample.

Once the constellation point is determined, its N-bit binary representation is then transmitted. If this model is immediately preceded by the QAMMOD model, then its output should be iden­tical to the input of the QAMMOD model. The output bit rate is equal to N times the input (I and Q) symbol rate.

Netlist Form

QAMDEM:Name n1 n2 n3 M=val [Rin1=Val] [Ri2 n=Val] [Rout=Val]

Netlist Example

QAMDEM:1 1 2 3 M=4

 



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