This question is related to the Antenna toolbox in MATLAB. I have found an online example from Mathworks, below is the link which shows the example. In particular I am interested in only the first example (null steering)
http://www.mathworks.com/help/phased/examples/array-pattern-synthesis.html
I don't currently own the antenna toolbox, but I am trying to generate the same figure for the first example (null steering). My questions regarding the exisiting code on the link provided above is
1- Are
column or row vectors?
2- Is the product
if so why is it then even used in the current code (it doesn't change the computation) ?
I have tried to write down my own code to plot the pattern that is shown in this link (first figure) as function of theta
Ntx=10;
c=3e8;
fc=1e9;
lambda=c/fc;
theta=-100:1:100;
for k=1:1:length(theta)
h_desired=((1/sqrt(Ntx))*exp(i*(2*pi/lambda)*(lambda/2)*[0:1:(Ntx-1)].*sin(0*pi/180)))';
h_interference=((1/sqrt(Ntx))*exp(i*(2*pi/lambda)*(lambda/2)*[0:1:(Ntx-1)].*sin(40*pi/180)))';
h_test=((1/sqrt(Ntx))*exp(i*(2*pi/lambda)*(lambda/2)*[0:1:(Ntx-1)].*sin(theta(k)*pi/180)))';
rn = h_interference'*h_desired/(h_interference'*h_interference);
w_r = h_desired-h_interference*rn;
magnitude= abs(h_test'*w_r);
y(k)= (20*log10(magnitude));
end
figure
plot(theta,y,'r')
xlabel('theta')
ylabel('Normalized Power dB')
grid on
As you can see I don't obtain correct results, in particular the null at 40 degrees is almost -300 dB what is the problem, the example from mathworks gives -100db (please check link)?
Looking forward for your answers
