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Sherif
Sherif 2011-3-21
K = 128; % SIZE OF FFT
N = 4; % NUMBER OF SELECTIONS
QPSK_Set = [1 -1 1i -1i];
Phase_Set = [1 -1];
MAX_SYMBOLS = 1e5;
PAPR_Orignal = zeros(1,MAX_SYMBOLS);
PAPR_SLM = zeros(1,MAX_SYMBOLS);
X = zeros(N,K);
Index = zeros(N,K);
for nSymbol=1:MAX_SYMBOLS
Index(1,:) = randi(1,K,length(QPSK_Set))+1;
Index(2:N,:) = randi(N-1,K,length(Phase_Set))+1;
X(1,:) = QPSK_Set(Index(1,:));
Phase_Rot = Phase_Set(Index(2:N,:));
X(2:N,:) = repmat(X(1,:),N-1,1).*Phase_Rot;
x = ifft(X,[],2);
Signal_Power = abs(x.^2);
Peak_Power = max(Signal_Power,[],2);
Mean_Power = mean(Signal_Power,2);
PAPR_temp = 10*log10(Peak_Power./Mean_Power);
PAPR_Orignal(nSymbol) = PAPR_temp(1);
PAPR_SLM (nSymbol) = min(PAPR_temp);
end
[cdf1, PAPR1] = ecdf(PAPR_Orignal);
[cdf2, PAPR2] = ecdf(PAPR_SLM);
semilogy(PAPR1,1-cdf1,'-b',PAPR2,1-cdf2,'-r')
legend('Orignal','SLM')
title('N=4')
xlabel('PAPR0 [dB]');
ylabel('CCDF (Pr[PAPR>PAPR0])');
grid on
when i try to run this script following error is occoured and script was not working....
??? Undefined function or variable 'SLM'.
please do help....its really urgent..and i dont have much time
thank you very very much

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采纳的回答

Walter Roberson
Walter Roberson 2011-3-21
Where does the error occur, exactly? The only place that you use SLM is in a quoted string in legend(), which will treat it as a string and not try to execute it.

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