genqamdemod
General quadrature amplitude demodulation
Syntax
Description
Examples
General QAM Modulation and Demodulation
Create the points that describe a hexagonal constellation.
inphase = [1/2 1 1 1/2 1/2 2 2 5/2]; quadr = [0 1 -1 2 -2 1 -1 0]; inphase = [inphase;-inphase]; inphase = inphase(:); quadr = [quadr;quadr]; quadr = quadr(:); const = inphase + 1i*quadr;
Plot the constellation.
h = scatterplot(const);
Generate input data symbols. Modulate the symbols using this constellation.
x = [3 8 5 10 7]; y = genqammod(x,const);
Demodulate the modulated signal, y
.
z = genqamdemod(y,const);
Plot the modulated signal in same figure.
hold on; scatterplot(y,1,0,'ro',h); legend('Constellation','Modulated signal'); hold off;
Determine the number of symbol errors between the demodulated data to the original sequence.
numErrs = symerr(x,z)
numErrs = 0
Input Arguments
y
— Complex envelope
scalar | vector | matrix | 3-D array
Complex envelope, specified as a scalar, vector, matrix, or 3-D array of numeric
values. If y
is a matrix with multiple rows, the function processes
the rows independently.
const
— Signal mapping
complex vector
Signal mapping, specified as a complex vector.
Data Types: double
| single
Complex Number Support: Yes
Output Arguments
z
— Message signal
scalar | vector | matrix | 3-D array
Message signal, returned as a scalar, vector, matrix, or 3-D array of numeric
values. The message signal consists of integers between 0 and
length
(const
)–1. The datatype of
z
is the same as the data type of input
x
.
Data Types: double
| single
Extended Capabilities
C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.
Version History
Introduced before R2006a
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