Scicos Block
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M-ary Phase Shift Keying demodulator block

Contents

• M-ary Phase Shift Keying demodulator block
  • Palette
  • Description
  • Dialog box
  • Default properties
  • Interfacing function
  • Computational function
  • See also
  • Authors

Palette

• Communication - Communication palette

Description

This M-PSK demodulator takes in input two [I;Q] (respectively [u1;u2]) components (real values) and computes a symbol number (integer value) in accordance with the M-PSK modulator block. The phase is evaluated with the equation :

$$\begin{eqnarray} \varphi_{demod}&=&\arctan\left(\frac{-u_{2}}{u_{1}}\right) \end{eqnarray}$$

and the block computes the output integer value with the formula:

$$\begin{eqnarray} y&=&(int)\frac{\varphi_{demod}M}{2\pi} \end{eqnarray}$$

where M is the number of states.

Dialog box

• Number of states
  The number of state of the modulation.
  Type 'vec' de taille 1.

• Inherit (no:0, yes:1)
  Herits events by its regular input ports (disable the event input port).
  Type 'vec' de taille 1.

Default properties

• always active: no
• direct-feedthrough: yes
• zero-crossing: no
• mode: no
• regular inputs:
  - port 1 : size [1,1] / type 1
  - port 2 : size [1,1] / type 1
  
• regular outputs:
  - port 1 : size [1,1] / type 1
  
• number/sizes of activation inputs: 0
• number/sizes of activation outputs: 0
• continuous-time state: no
• discrete-time state: no
• object discrete-time state: no
• name of computational function: demodpsk

Interfacing function

• MODNUMCOS/macros/scicos_blocks/Communication/DEMODPSK_f.sci [view code]

Computational function

• MODNUMCOS/routines/communication/demodpsk.c (Type 4) [view code]

See also

• MODPSK_f - M-ary Phase Shift Keying Modulator block (Scicos Block)
• MODQAM_f - Quadrature Amplitude Modulation modulator block (Scicos Block)
• DEMODQAM_f - Quadrature Amplitude Modulation demodulator block (Scicos Block)
• MODGEN_c - Generic symbol modulator block (Scicos Block)
• DEMODGEN_c - Generic symbol demodulator block (Scicos Block)

Authors

A. Layec