Documentation

This is machine translation

Translated by Microsoft
Mouseover text to see original. Click the button below to return to the English verison of the page.

Note: This page has been translated by MathWorks. Please click here
To view all translated materals including this page, select Japan from the country navigator on the bottom of this page.

pamdemod

Pulse amplitude demodulation

Syntax

z = pamdemod(y,M)
z = pamdemod(y,M,ini_phase)
z = pamdemod(y,M,ini_phase,symbol_order)

Description

z = pamdemod(y,M) demodulates the complex envelope y of a pulse amplitude modulated signal. M is the alphabet size. The ideal modulated signal should have a minimum Euclidean distance of 2.

z = pamdemod(y,M,ini_phase) specifies the initial phase of the modulated signal in radians.

z = pamdemod(y,M,ini_phase,symbol_order) specifies how the function assigns binary words to corresponding integers. If symbol_order is set to 'bin' (default), the function uses a natural binary-coded ordering. If symbol_order is set to 'gray', it uses a Gray-coded ordering.

Examples

collapse all

Modulate and demodulate random integers using pulse amplitude modulation. Verify that the output data matches the original data.

Set the modulation order and generate 100 M-ary data symbols.

M = 12;
dataIn = randi([0 M-1],100,1);

Perform modulation and demodulation operations.

modData = pammod(dataIn,M);
dataOut = pamdemod(modData,M);

Compare the first five symbols.

[dataIn(1:5) dataOut(1:5)]
ans =

     9     9
    10    10
     1     1
    10    10
     7     7

Verify that there are no symbol errors in the entire sequence.

symErrors = symerr(dataIn,dataOut)
symErrors =

     0

Introduced before R2006a

Was this topic helpful?