QAM simulation in matlab/simulink

qam matlab

Hi,I am trying to design the timing recovery loop in the QAM demodulator.If i have finished the algorithm design of the loop,then how can i verify my design in the matlab/simulink?How can i get the proper input I/Q data and the right output data,which can be used to verify my verilog implementation?
Thanks!

matlab qam

1) generate input I/Q data in MATLAB
2) read this data in simulator (Modelsim, Aldec, etc.)
3) save output data of your design in simulator
4) compare the output data of hdl design and MATLAB model

Aldec and Modelsim also can work with MATLAB directly, but i don't know how

qam simulink

How to generate the proper I/Q data and set the matlab simulation model?
That is to say,how to verify my algorithm ?
That is critical.

16 qam matlab

for example, the simulink demos:
Rayleigh Fading Channel generate the qpsk I/Q signals

you can to convert this demos to qam I/Q signal generator

qam matlab code

mhytr said:

How to generate the proper I/Q data and set the matlab simulation model?

Click to expand...

u can use the Random integer generator block in the simulink to generate random pulses for the QAM signal. then u can use the doppler block and the AWGN channel for generating the real QAM modulated signals. Verify ur I/Q outputs using the Discrete-Time Scatter plots.

16qam matlab

echo on
K=10;N=2*K;T=100;
a=rand(1,36);
a=sign(a-0.5);
b=reshape(a,9,4);
% Generate the 16QAM points
XXX=2*b,1)+b,2)+j*(2*b,3)+b,4));
XX=XXX';
X=[0 XX 0 conj(XX(9:-1:1))];
xt=zeros(1,101);
for t=0:100
for k=0:N-1
xt(1,t+1)=xt(1,t+1)+1/sqrt(N)*X(k+1)*exp(j*2*pi*k*t/T);
echo off
end
end
echo on
xn=zeros(1,N);
for n=0:N-1
for k=0:N-1
xn(n+1)=xn(n+1)+1/sqrt(N)*X(k+1)*exp(j*2*pi*n*k/N);
echo off
end
end
echo on
pause % press any key to see a plot of x(t)
plot([0:100],abs(xt))
% Check the difference between xn and samples of x(t)
for n=0:N-1
d(n+1)=xt(T/N*n+1)-xn(1+n);
echo off
end
echo on
e=norm(d);
Y=zeros(1,10);
for k=1:9
for n=0:N-1
Y(1,k+1)=Y(1,k+1)+1/sqrt(N)*xn(n+1)*exp(-j*2*pi*k*n/N);
echo off
end
end
echo on
dd=Y(1:10)-X(1:10);
ee=norm(dd);

modulacion qam matlab

Hello,
Can anyone plz explain, how this formula works,
XXX=2*b,1)+b,2)+j*(2*b,3)+b,4));
What is the idead behind using this fromula to generate 16 QAM.
thankyou.

qam simulation using matlab

i need it too

qam simulation

hi ashay.deshpande
XXX=2*b,1)+b,2)+j*(2*b,3)+b,4));
is same as
for (i=0;i<size of b array;i++)
XXX+=2*b(i,1)+b(i,2)+j*(2*b(i,3)+b(i,4));

so : implies all the values in an array

matlab qam signal

i also want 2 know how simulations of QAM r done