What does toeplitz do in this code?

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Fariha Sneha
Fariha Sneha 2019-4-8
评论： Guillaume 2019-4-8
hello.can anyone help me to understand this code about mimo correlated fading channel?i
will be forever greatful.
function hh=channel coeff(NR,NT,n,rtx,rrx,type)
h=sqrt(1/2)*(randn(nr*nt,n)+j*randn(nr*nt,n))
if nargin,hh=h; return,end
if isvector(rtx)=toeplitz(rtx);
if isvector(rrx),toeplitz(rrx);
if strcmp(type,'complex')
c=chol(kron(rtx,rrx));
else
c=sqrtm(sqrt(kron(rtx,rrx)));
end
hh=zeros(nr,nt,n);
for i=1:n
tmp=c*h(: ,);
hh(: , : , i)=reshape(nr*nt*n);
end
  2 个评论
Matt J
Matt J 2019-4-8
Looks like a coding bug to me.
Guillaume
Guillaume 2019-4-8
if isvector(rtx)=toeplitz(rtx);
is not valid matlab syntax. The = is illegal there, and the if appears to be missing a matching end
if isvector(rrx),toeplitz(rrx);
is also missing a matching end. Otherwise the syntax is legal but since the result of toeplitz is not assigned to anything, the whole thing is pointless.
Perhaps the best person to ask about this code is the author.
I wouldn't recommend using unknown code that does not even have a single comment explaining what it does. That's not a very good mark of quality.

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