to plot BER curve for IDWT

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ABDUL 2020-10-16

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https://ww2.mathworks.cn/matlabcentral/answers/615948-to-plot-ber-curve-for-idwt

编辑： ABDUL 2020-10-16

i am not able to plot the proper ber curve .this is my piece of code which is attached for your reference

clc;
clear all;
close all;
PSK = 4; SNR = -5;
M_rx = 1; % No. of Rx antennas
SNRs = -50:20; % signal-to-noise ratios: -10dB … 20dB
bit_errors = zeros(length(SNRs), 1); % BER with respect to SNR
%implementation of the The transmitter
data = randi([0 PSK-1],64,1000);
symbol = pskmod(data, PSK, 0, 'Gray');
% symbol = qammod(data, PSK, 0, 'Gray');
%to Perform parallel to serial  conversion 
pstx=reshape(symbol,1,[]);
%to perform IDWT operation 
AC =pstx; %% approximation coefficients
DC = zeros(size(pstx));%% detailed (wavelet) coefficients
IDWT=idwt(AC,DC,'haar').';% IDWT process
%implementation of the receiver 
for SNR_idx = 1:length(SNRs)
received_symbol = awgn(IDWT, SNRs(SNR_idx)).';
[ca cd]=dwt(received_symbol,'haar' );
%to perform parallel to serial conversion 
psrx=reshape(ca,64,1000);
estimated_data = pskdemod(psrx, PSK, 0, 'Gray');
% estimated_data = qamdemod(received_symbol, PSK, 0, 'Gray');
[no_of_error(SNR_idx), bit_errors(SNR_idx)]=biterr(data,estimated_data);
end
semilogy(SNRs , bit_errors); % plot with logarithmic y-axis
grid on; % show a grid
xlabel('SNR [dB]'); 
ylabel('BER'); % label x- and y-axis

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Raymond Norris 2020-10-16

Hi,

I would suggest posting a bit more detail about what you mean by "not able to plot the proper BER curve." Are you getting errors or the curve doesn't look right? For starters, AC appears to be complex and not real, which is causing problems with your call to idwt.

Raymond

ABDUL 2020-10-16