I am involved in steering the main beam in desired direction and producting nulls in unwanted direction. I have the following MATLAB code but when I run it , it gives me a polar plot. Also it doesn't give me the desired plot. I want to get a plot of type shown in image and to make the pattern such that it meets my requirement.
% Generalized Null Steering Broadside Beam former Weights Vector
clear all;close all;clc
a = 4; % Antenna elements
d = 0.5; %Spacing
f = 3e9; % operating frequency
%Input Received Signals Arrival
b = input ('The Angle of Incidence of The Desired Source Signal : ') ;
msgbox ('Enter The Angle of Incidence of The Interference Un-Desired Source Signals Respectively ') ;
pause
for I = 1 : a-1
A(I) = input ('The Angle of Incidence of the Undesired Interference Source Signal : ') ;
end
%Estimation of The Weight Vector of A Null Steering Beamformer
for I = 1 : a
for J = 1 : a
if I ==1
S ( I , J ) = exp ( i*( 2*pi*f*d*( J-1 )*cos ( b ))/( 3*10^8 )) ;
Z ( I ) = 1 ;
else
S ( I , J ) = exp ( i*(2*pi*f*d*( J-1 )*cos ( A(I-1) ))/( 3*10^8 )) ;
Z ( I )= 0 ;
end
end
end
W = ( pinv ( S ) * Z' ) ;
%Plot of The Output Radiation Pattern
% t = 0 : 0.05 : 2*pi ;
t = 0 : 0.05 : pi ;
M = 0 ;
for I = 1 : a
H = exp ( i*(2*pi*f*d*( I-1 )*cos ( t ))/( 3*10^8 )) ;
M = M + ( H * W(I) ) ;
end
M = abs ( M ) ;
polar ( t , M , '-r' ) , title ( 'The Generalized Null Steering Beam Former Output Radiation Pattern ') ,
grid on ;
make the following changes
% M=abs(M);
M = 20*log10(abs ( M )) ;
%polar ( t , M , '-r' ) ,
plot(t,M,'r')
fred h
Thank you very much for your kind response. I made the changes as you directed and ran the program, but it gave me the following error:
To use 'fred', the following product must be both licensed and installed:
Datafeed Toolbox
Error in steerer1 (line 51)
fred h
"fred h" is not a header and is not part of matlab keywords yet. It is a string meaning Fred Harris:
Thank you very much for your kind response. Ok that's right. But now what should I do? I mean to say how can I get my desired result?
