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qadm (MathScript RT Module Function)

LabVIEW 2012 MathScript RT Module Help

Edition Date: June 2012

Part Number: 373123C-01

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Owning Class: communications

Requires: MathScript RT Module


x = qadm(y, m)

x = qadm(y, m, phi)

x = qadm(y, m, phi, type)

Legacy Name: qamdemod


Demodulates a sequence of complex Quadrature Amplitude Modulated (QAM) symbols into a series of integers.



Name Description
y Specifies the symbols to demodulate. y is a complex, double-precision, floating-point scalar, vector, or matrix.
m Specifies to use m-ary QAM demodulation. m should be a square of a power of 2.
phi Specifies the initial phase in radians. The default phi is 0.
type Specifies the method to map symbols to demodulated integers. type is a string that accepts the following values:

'Bin' (default) Uses binary mapping to demodulated integers.
'Gray' Uses Gray-coded mapping to demodulated integers.


Name Description
x Returns the demodulated integers. x is an I32 scalar, vector, or matrix in the range [0, m-1].


The following table lists the support characteristics of this function.

Supported in the LabVIEW Run-Time Engine Yes
Supported on RT targets Yes
Suitable for bounded execution times on RT Not characterized


X = randint(1, 1000, 16)
Y = qam(X, 16, 0, 'Gray')
Z = qadm(Y, 16, 0, 'Gray')

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