How do you simulate QAM in Matlab?

Description. y = qammod( x , M ) modulates input signal x by using QAM with the specified modulation order M . Output y is the modulated signal. y = qammod( x , M , symOrder ) specifies the symbol order.

Table of Contents

How do I generate 16 QAM in Matlab?

Use the int 2bit function to convert the natural-encoded data symbols from the QAM demodulator into a binary vector with ( N sym × N bits / sym ) length. N sym is the total number of QAM symbols, and N bits / sym is the number of bits per symbol. For 16-QAM, N bits / sym = 4.

How do you create a frequency modulated signal in Matlab?

Examples

Copy Command Copy Code. Set the sampling frequency to 1kHz and carrier frequency to 200 Hz.
fs = 1000; fc = 200; t = (0:1/fs:0.2)’;
x = sin(2*pi*30*t)+2*sin(2*pi*60*t);
fDev = 50;
y = fmmod(x,fc,fs,fDev);
plot(t,x,’c’,t,y,’b–‘) xlabel(‘Time (s)’) ylabel(‘Amplitude’) legend(‘Original Signal’,’Modulated Signal’)

How do you plot a frequency spectrum of an FM signal in Matlab?

How to plot the frequency spectrum of a signal on Matlab?

clear all;clc.
Fs = 200; % Sampling frequency Fs >> 2fmax & fmax = 50 Hz.
t = 0:1/Fs:7501; % length (x) = 7501.
x = 50*(1+0.75*sin(2*pi*t)).*cos(100*pi*t); % AM Signal.
xdft = (1/length(x)).*fft(x);
freq = -100:(Fs/length(x)):100-(Fs/length(x)); %Frequency Vector.

How do you plot a message signal in Matlab?

How to plot Carrier and Message Signal

The first picture is the equation for carrier signal and the 2nd one is the message signal.
The ampltitudes for both (Ac and Am are 1), and the frequency for the carrier (fc) is given by the user, whereas the frequency for the message (fm) is 0.02.

How do you convert QAM to matrix in MATLAB?

Use the de2bi function to convert the data symbols from the QAM demodulator, dataSymbolsOut, into a binary matrix, dataOutMatrix, with dimensions –by–. In the matrix, is the total number of QAM symbols, and is the number of bits per symbol. For 16-QAM, = 4.

How do you modulate data in QAM?

Modulate the data using the qammod function. Display the modulated signal constellation using the scatterplot function. Set the modulation order to 256, and display the scatter plot of the modulated signal. Modulate random data symbols using QAM. Normalize the modulator output so that it has an average signal power of 1 W.

How do you use QAM to modulate a scatter plot?

Modulate data using QAM and display the result in a scatter plot. Set the modulation order to 16 and create a data vector containing each of the possible symbols. Modulate the data using the qammod function. Display the modulated signal constellation using the scatterplot function.

How does the QAM function scale the constellation in QAM?

When this flag is 1 ( true ), the function scales the constellation to the average power of one watt referenced to 1 ohm. When this flag is 0 ( false ), the function scales the constellation so that the QAM constellation points are separated by a minimum distance of two.

How do you simulate QAM in Matlab?