Why does this code give error?
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clear;clc
%%
fc = 3e8;% Carrier frequency
Nb = 1000;% Number of snapshots
c = 3e8;
wavelength = c/fc;% The wavelength of the received signal
d = 0.5*wavelength;
theta = [5 40];
M = length(theta);% Number of signals
N = 10;% Number of antennas
% Wavenumber
beta = 2*pi/wavelength;
% Signal amplitude
A = 1;
% SNR (dB)
snr = 5;
% Variance of noise
sigma=sqrt((A^2)/(2*10^(snr/10)));
% Source signal
D = randi(M,Nb,1);
S =A*(2*D - 1);
% The electrical phase shift from element to element along the array
phi=beta*d*cos(theta*pi/180);
% Matrix of steering vectors
for i=1:M
for k=1:N;
VecteurDirectionnel(k,i)= exp(j*(k-1)*phi(i));
end
end
% White Gaussien noise
B = (sigma^2)*(randn(N,Nb)+j*randn(N,Nb))/sqrt(2);
% Array output:signal plus noise
X = VecteurDirectionnel*S+B;
% Estimation of the spatial correlation matrix of the observed signal
Rxx = X*X'/Nb;
% Eigen decomposition
[Vi,Li] = eig(Rxx);
[L,I] = sort(diag(Li),'descend');
V = Vi(:,I);
Vs = V(:,1:M);
Vs1=Vs(1:N-1,:);
Vs2=Vs(2:N,:);
% Direction Of Arrival
% Least square
xsi=linsolve(Vs(1:N-1,:),Vs(2:N,:));
% DOA estimation
doa=acosd((angle(eig(xsi))/(2*pi*d)))
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采纳的回答
Matt J
2024-4-16
编辑:Matt J
2024-4-16
As you can see, VecteurDirectionnel and S are the wrong sizes for matrix multiplication,
whos VecteurDirectionnel S
% Array output:signal plus noise
X = VecteurDirectionnel*S+B;
6 个评论
Matt J
2024-4-19
Well S is Nb x 1 because D is Nb x 1, from this line,
D = randi(M,Nb,1);
Perhaps you meant to have,
D = randi([low, hi] , [M,Nb]);
but we have no way of knowing what you intended the low and hi limits to be.
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