representation of the QPSK modulated signal

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Niloofar Jafarnia
Niloofar Jafarnia 2021-6-29
评论： Niloofar Jafarnia 2021-7-20
I want the code that coresponde the functionality of the QPSK modulator block (simulink). I need to have the signal representation of The QPSK modulated signal that comes from the 'pskmod' funktion,I multiplied it simply by a sine wave but I am not shure if I should use a raised cosine filter instead. what I need at the end is the modulated QPSK signal that can be transmitted. here is my code:
M=4; % modulation order
data = randi([0,M-1],1,100);
Fc=100; % in Hz, carrier frequency
t=0:0.1:(10-0.1); % time step (carrier sine wave)
P=0;
modsig = pskmod(data,M,P); % PSK modulation
carrier = sin(2*pi*Fc*t);% carrier sine wave
sigpsk = carrier.*modsig;
figure
plot(t,sigpsk);
xlabel('Time');
ylabel('Amplitude');
title('psk Modulated Data');

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Arthi Sathyamurthi
Arthi Sathyamurthi 2021-7-19
Hello Niloofar,
To get the code corresponding to the functionality of the QPSK modulator block, use comm.QPSKModulator.
To get a modulated QPSK signal that can be transmitted implement all the blocks of the transmitter. You can use the raised cosine filtering function to implement the raised cosine filter after carrier multiplication for pulse shaping before transmission.

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