Cedric Roux
56c66c09aa
Pre-ci test passed git-svn-id: http://svn.eurecom.fr/openair4G/trunk@4000 818b1a75-f10b-46b9-bf7c-635c3b92a50f
34 lines
810 B
Matlab
34 lines
810 B
Matlab
function [CAP] = MISO_CVQ(HS,Hq,n_p,mu)
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% [CAP] = MISO_CVQ(HS,Hq,n_p,mu)
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%
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% This function calculates the capacity of a multiuser system
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% assuming channel vector quatization [1].
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%
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% [1] Philips, "System-level simulation results for channel vector
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% quantisation feedback for MU-MIMO" 3gpp TSG RAN WG1 R1-063028, Nov. 2006
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[N_User, N_Tx] = size(HS);
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if (HS == zeros(N_User,N_Tx))
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CAP = 0;
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else
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HH = Hq*Hq'+mu*eye(N_User);
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HH_inv = inv(HH);
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W = Hq'*HH_inv;
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% normalize W such that trace(W'*W)=1
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% this way we do not need the factor 1/NTx in the capacity formula
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W = W/sqrt(trace(W'*W));
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HW = abs(HS*W).^2;
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CAP = 0;
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for v = 1:length(HW)
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CAP = CAP + log2(1 + (HW(v,v)/(sum(HW(v,:)) - HW(v,v) + n_p)));
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end %of for loop
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end %of if loop HS
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