Need Urgent Help

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

Answer 1

[Walter Roberson]

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.