Cedric Roux
56c66c09aa
Pre-ci test passed git-svn-id: http://svn.eurecom.fr/openair4G/trunk@4000 818b1a75-f10b-46b9-bf7c-635c3b92a50f
108 lines
2.9 KiB
Matlab
108 lines
2.9 KiB
Matlab
% This script compares the capacity of MU-MIMO using ZF/MMSE precoding
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% with and without feedback quantization
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%
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% Author: Florian Kaltenberger
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% Date: 19.2.2008
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% Last changes: 28.3.2008
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clear all
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close all
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bit_vec = [4 6]; % 8 12 16];
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N_User = 4;
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N_Tx = 4;
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N_runs = 100;
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N_codebooks = 1;
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%AoD = rand(1,N_User)*pi;
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%AoD = [3.0070 1.5249 2.5142 0.4457];
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SNRdB = 0:10:40;
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%SNR = 10.^(SNRdB./10);
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%n_p = 1./SNR;
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%mu = N_Tx/SNR;
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CAP_4U_MMSE_CVQ = zeros(length(SNRdB),N_runs,length(bit_vec));
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CAP_4U_ZF_CVQ = zeros(length(SNRdB),N_runs,length(bit_vec));
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CAP_4U_MMSE_RVQ = zeros(length(SNRdB),N_runs,length(bit_vec),N_codebooks);
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CAP_4U_ZF_RVQ = zeros(length(SNRdB),N_runs,length(bit_vec),N_codebooks);
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CAP_4U_MMSE = zeros(length(SNRdB),N_runs);
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CAP_4U_ZF = zeros(length(SNRdB),N_runs);
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%Hn = zeros(N_User,N_Tx);
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%Codebook = codebookRVQ(N_Tx,max(bit_vec),N_codebooks);
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load Codebook
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Fourier_Codebook_ind = zeros(N_runs,length(bit_vec),N_User);
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Random_Codebook_ind = zeros(N_runs,length(bit_vec),N_User);
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%%
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for d=1:length(SNRdB)
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SNR = 10.^(SNRdB(d)./10);
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n_p = 1./SNR;
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mu = N_Tx/SNR;
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for a = 1:N_runs
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disp(a)
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HS = complex(randn(N_User,N_Tx),randn(N_User,N_Tx))./sqrt(2); %+ ...
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%10*exp(1j*2*AoD.'*(0:N_Tx-1)./N_Tx);
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%10 * complex(randn(N_User,N_Tx),randn(N_User,N_Tx))./sqrt(2);
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%HS = HS./norm(HS);
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Random_Codebook_ind(a,:,:) = get_codebook_idx(HS,Codebook(:,1:pow2(max(bit_vec)),1:4),bit_vec);
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for b = 1:length(bit_vec)
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[HqF, Fourier_Codebook_ind(a,b,:)] = quantize_H(HS,bit_vec(b));
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CAP_4U_MMSE_CVQ(d,a,b) = MISO_CVQ(HS.',HqF.',n_p,mu);
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%CAP_4U_ZF_CVQ(d,a,b) = MISO_CVQ(HS.',HqF.',n_p,0);
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HqR = Codebook(:,Random_Codebook_ind(a,b,:),5);
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% Hq has to have the same amplitude as H
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for k=1:N_User
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HqR(:,k) = HqR(:,k).*norm(HS(:,k));
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end
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CAP_4U_MMSE_RVQ(d,a,b,1) = MISO_CVQ(HS.',HqR.',n_p,mu);
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%CAP_4U_ZF_RVQ(d,a,b,1) = MISO_CVQ(HS.',HqR.',n_p,0);
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end
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CAP_4U_MMSE(d,a) = MISO_MMSE(HS.',n_p,mu);
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%CAP_4U_ZF(d,a) = MISO_MMSE(HS.',n_p,0);
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end
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end
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% CAP(isnan(CAP)) = 0;
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%%
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%save cap_lim_feedback_iid.mat
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%%
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ECAP_4U_MMSE_CVQ = squeeze(mean(mean(CAP_4U_MMSE_CVQ,2),4));
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ECAP_4U_MMSE_RVQ = squeeze(mean(mean(CAP_4U_MMSE_RVQ,2),4));
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ECAP_4U_MMSE = squeeze(mean(CAP_4U_MMSE,2));
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%%
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figure(2)
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hold off
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plot(bit_vec,squeeze(mean(mean(CAP_4U_MMSE_CVQ,2),4)))
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hold on
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plot(bit_vec,squeeze(mean(mean(CAP_4U_MMSE_RVQ,2),4)),'r')
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plot(bit_vec,repmat(mean(CAP_4U_MMSE),length(bit_vec),1),'k')
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legend('CVQ feedback','RVQ feedback','perfect feedback')
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xlabel('feedback bits')
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ylabel('capacity')
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%%
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figure(3)
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hold off
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cdfplot(CAP_4U_MMSE_CVQ(end,:,end,:))
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hold on
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h=cdfplot(CAP_4U_MMSE_RVQ(end,:,end,:));
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set(h,'color','r');
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h=cdfplot(CAP_4U_MMSE(end,:));
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set(h,'color','k');
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legend('CVQ feedback','RVQ feedback', 'perfect feedback')
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