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Pls help me generate circulant matrix

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Janet
Janet 2012-3-6
编辑： Emmanuel Ijiga 2016-10-2
I want to create M x M circulant matrix where M=128
h1=gallery('circul',M:M/2);
h2=gallery('circul',M:M/2);
h=horzcat(h1,h2);
But I get error with this coding.
pls see this link for more info
http://www.eurasip.org/Proceedings/Eusipco/Eusipco2007/Papers/b2l-c02.pdf
in page 2 (2.2 mimo-ofdm sytem)

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采纳的回答

Honglei Chen
Honglei Chen 2012-3-6
You may want to use
M:-1:M/2
in your code, or something like that.
M:M/2
returns an empty vector so there is nothing to construct from it.
BTW, you can also use linspace. Say you want 5 points between M and M/2, just do
linspace(M,M/2,5)
  1 个评论
Jan
Jan 2012-3-6
@melody: You do not have to create two equal matrices to join them. h = [h1, h1] is ok.

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Emmanuel Ijiga
Emmanuel Ijiga 2016-10-2
编辑：Emmanuel Ijiga 2016-10-2
M = 20;
input = randi([0 15], 1, M); %Random Input values between 0 and 15
CM = zeros(M,M); %Initialize M X M Circulant Matrix (CM)
CM(1,:) = input; %place the input values in the first row of CM
for kk = 1:(size(CM,1) - 1)
CM(kk+1,1) = CM(kk,end);
CM(kk+1,2:end) = CM([kk],[1:end - 1])
end

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