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System Simulator >
System Component Models >
Modulators >
PI/4 DQPSK Modulator (DQPSKMOD)

PI/4 DQPSK Modulator (DQPSKMOD)

Property	Description	Units	Default	Range
RIN1	Input impedance	Ohm	Inf	(0, Inf]
ROUT1	Output1 impedance	Ohm	0	[0, Inf)
ROUT2	Output2 impedance	Ohm	0	[0, Inf)
Ports
Input	Integer symbol values A(n) ( real)
Output1	in-phase output of modulator ( real)
Output2	Quadrature output of modulator (real}

Notes

1. This model performs PI/4DQPSK modulation. The input to this model is assumed to be the symbol values A(n) = 0, 1, 2, 3 for n ³ 0. The modulation information is stored differentially in the phase. Specifically, the in-phase and quadrature outputs of the modulator are given by cos(theta(n)) and sin(theta(n)) respectively, where
theta(-1) = PI/4, and
theta(n) = theta(n-1) + delta_theta(n), n ³ 0
PI/4 if A(n) = 0
3 * PI/4 if A(n) = 1
delta_theta(n) =
7 * PI/4 if A(n) = 2
5 * PI/4 if A(n) = 3

Netlist Form

DQPSKMOD:Name n1 n2 n3 [Rin=Val] [Rout=Val]

Netlist Example

DQPSKMOD:1 1 2 3

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