- Fix: avoid infinite loop on mulitcast read thread if no data to read

Pre-ci test passed git-svn-id: http://svn.eurecom.fr/openair4G/trunk@4000 818b1a75-f10b-46b9-bf7c-635c3b92a50f
2013-06-25 09:05:02 +00:00
commit 56c66c09aa
4111 changed files with 2133103 additions and 0 deletions
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+function [Hq,idx] = quantize_H_codebook(H,Codebook)
+% Hq = quantize_H(H, codebook)
+%
+% This function quantizes H according to the given codebook
+% 
+% Parameters:
+%   H           [N_Tx x N_User]     Channel matrix to be quatized
+%   codebook    [N_Tx x N_codes]    Codebook
+
+[N_Tx, N_User] = size(H);
+
+N_codes = size(Codebook,2);
+
+if size(Codebook,1) ~= N_Tx
+    error('codebook must be of size [N_Tx x N_codes]');
+end
+
+% normalize the channel
+for k=1:N_User
+    normH(k) = norm(H(:,k));
+    H(:,k) = H(:,k)./norm(H(:,k));
+end
+
+d = zeros(N_codes,N_User);
+for k=1:N_User
+    for i=1:N_codes
+        d(i,k) = Codebook(:,i)'*H(:,k);
+    end
+end
+
+% plot(abs(d))
+
+[m,idx] = max(abs(d));
+
+Hq = Codebook(:,idx);
+
+% Hq has to have the same amplitude as H
+for i=1:N_User
+   % Hq(:,i) = Hq(:,i).*d(idx(i),i).*normH(i);
+   Hq(:,i) = Hq(:,i).*normH(i);
+end
+