Scicos Block
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Quadrature Amplitude Modulation demodulator block

Contents

• Quadrature Amplitude Modulation demodulator block
  • Palette
  • Description
  • Dialog box
  • Default properties
  • Interfacing function
  • Computational function
  • See also
  • Authors

Palette

• Communication - Communication palette

Description

The M-QAM demodulator block is the pair block of the M-QAM modulator block. The input values of this block must be integers, as defined at the output of the modulator block, in order to properly work. The dialogue parameter 'Number of states', which defines the number of states of the modulation must be a value computed with the formula :

$$\begin{eqnarray} M=2^{k} \end{eqnarray}$$

with k an even integer number.

Dialog box

• Number of states
  The number of states 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: demodqam

Interfacing function

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

Computational function

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

See also

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

Authors

A. Layec