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Ansoft Designer / Ansys Designer 在线帮助文档：

System Simulator >
System Component Models >
Modulators >
   Quadrature Amplitude Modulator (QAMMOD)       

Quadrature Amplitude Modulator (QAMMOD)

 

 


Property

Description

Units

Default

Range

M

Order of QAM constellation

None

4

(0, Inf)/Integer

RIN

Input impedance

Ohm

Inf

(0, Inf]

ROUT1

Output impedance

Ohm

0

[0, Inf)

ROUT2

Output impedance

Ohm

0

[0, Inf)

Ports

Input

Input signal (real)

Output1

in-phase output (real)

Output2

Quadrature output (real)

 

Notes

1. For a given stream of input bits, this model combines every incoming N bits, where

and M is the order of the constellation space (i.e. M=4 for 4-QAM, M=16 for 16-QAM, and M=64 for 64-QAM).

Each incoming N bits are split into half, N/2 bits are used to compute the in-phase output sam­ple and the other N/2 bits are used to compute the corresponding quadrature output sample.
For each N/2 input bits (per I and Q), the corresponding in-phase and quadrature output sam­ples are computed according to




Where, MI and MQ are the corresponding decimal values of the N/2 in-phase and quadrature binary bits. The output (I and Q) symbol rate is equal to 1/N times the input bit rate.

Netlist Form

QAMMOD:Name n1 n2 n3 M=val [Rin=Val] [Rout=Val]

Netlist Example

QAMMOD:1 1 2 3 M=4



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