I have another problem. Can someone check and tell me what should I do?

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Alexandra Diaconu 2018-8-30

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https://ww2.mathworks.cn/matlabcentral/answers/416821-i-have-another-problem-can-someone-check-and-tell-me-what-should-i-do

评论： Dennis 2018-8-30

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This is the error message: >> p4_16_Simulate_BER_of_BPSK_Mod_in_the_AWGN_Channel Index exceeds matrix dimensions.

Error in p4_16_Simulate_BER_of_BPSK_Mod_in_the_AWGN_Channel (line 31) bin_signal=bin_signal(1:SigLen*nsamp);

This is the code:

   Rb=1;
% normalized bit rate
fc=Rb*5;
% carrier frequency;
Tb=1/Rb;
% bit duration
Eb=1;
% energy per bit
SigLen=1000;
% number of bits or symbols
fsamp=fc*10;
% sampling rate
nsamp=fsamp/Rb;
% samples per symbols
Tsamp=Tb/nsamp;
% sampling time
Tx_filter=ones(1,nsamp);
% transmitter filter
bin_data=randi(1,SigLen);
%generating prbs of length SigLen
data_format=2*bin_data-1;
% BPSK constillation
t=Tsamp:Tsamp:Tb*SigLen;
% time vector
carrier_signal=sqrt(2*Eb/nsamp)*sin(2*pi*fc*t);
% carrier signal
bin_signal=conv2(Tx_filter,upsample(data_format,nsamp),'shape');
%bin_signal=rectpulse(OOK,nsamp);
% rectangular pulse shaping
bin_signal=bin_signal(1:SigLen*nsamp);
Tx_signal=bin_signal.*carrier_signal;
% transmitted signal
Eb_N0_dB=-3:10;
% multiple Eb/N0 values
for ii=1:length(Eb_N0_dB)
Rx_signal=awgn(Tx_signal,Eb_N0_dB(ii)+3-10*log10(nsamp),'measured');
% additive white gaussian noise
Rx_output=Rx_signal.*carrier_signal;
% decoding process
for jj=1:SigLen
output(jj)= sum(MF_output((jj-1)*nsamp+1:jj*nsamp));
% matched filter output
% alternatively method of matched filter is given in OOK
simulation
end
rx_bin_data=zeros(1,SigLen);
rx_bin_data(output>0)=1;
[nerr(ii) ber(ii)]=biterr(rx_bin_data,bin_data);
end
figure
semilogy(Eb_N0_dB,ber,'bo','linewidth',2);
hold on
semilogy(Eb_N0_dB,0.5*erfc(sqrt(10.^(Eb_N0_dB/10))),'r-X','linewidth',2);
% theoretical ber, 'mx-');

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Dennis 2018-8-30

编辑：Dennis 2018-8-30

Check the size of bin_signal before the error occurs. You want to access bin_signal(1:50000), check if that entry exists. Consider that bin_signal might be a 2D matrix and not a vector.

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