arrays have incompatible sizes for this operation help me PLZ

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Mahra Albadi
Mahra Albadi on 14 Nov 2021
Commented: Mahra Albadi on 28 Nov 2021
clear;close all;clc
counter=1;
min_nl=-10;
step_nl=1;
max_nl=0;
noise_levelsdB=min_nl:step_nl:max_nl;
for k=min_nl:step_nl:max_nl
k
data_size = 10000;
data =randi([0 1], data_size, 1); data=data';
bp=0.000001;
expand=100;
baseband=zeros(1,length(data)*expand);
for n=1:1:length(data)
if data(n)==1
se=ones(expand,1);
else
data(n)=0;
se=zeros(expand,1);
end
baseband((n-1)*expand+1:n*expand)=se;
end
end
A=sqrt(2); %Amplitude carrier
br=1/bp;%bit rate 1 mbps
f=br*11; % carrier freq 2Mz
t_bit=bp/expand:bp/expand:bp;
ss=length(t_bit);
transmitterCarrier=A*sin(2*pi*f*t_bit);
%show modulated signal%
basebandNRZ=(2*baseband-1);
modulated_signal=transmitterCarrier.*basebandNRZ;
sigma2=1/10^(k/20);
noise=sigma2*randn(1, length(modulated_signal));
noisy_modulated_signal=modulated_signal+noise;
demodulated_data=[];
carrier_receiver=sin(2*pi*f*t_bit);
for n=ss:ss:length(noisy_modulated_signal)
demodulated_signal=carrier_receiver.*noisy_modulated_signal((n-(ss-1)):n);
z=trapz(t_bit,demodulated_signal);
zz=round((2*z/bp));
if(zz>0)
a=1;
else
a=0;
end
demodulated_data=[demodulated_data a];
end
close all
semilogy(noise_levelsdB,BER)
xlabel('Eb/No(dB)')
ylabel('BER BPSK')
grid on
title('(Aaesha Mahra A, Mahra M)')
hold on
error in line 35

Answers (1)

VBBV
VBBV on 18 Nov 2021
clear;close all;clc
counter=1;
min_nl=-10;
step_nl=1;
max_nl=0;
noise_levelsdB=min_nl:step_nl:max_nl;
for k=min_nl:step_nl:max_nl
k;
data_size = 10000;
data =randi([0 1], data_size, 1); data=data';
bp=0.000001;
expand=100;
baseband=zeros(1,length(data)*expand);
for n=1:1:length(data)
if data(n)==1
se=ones(expand,1);
else
data(n)=0;
se=zeros(expand,1);
end
baseband((n-1)*expand+1:n*expand)=se;
end
end
A=sqrt(2); %Amplitude carrier
br=1/bp;%bit rate 1 mbps
f=br*11; % carrier freq 2Mz
t_bit=logspace(bp/expand,bp,length(br));
ss=length(t_bit);
transmitterCarrier=A*sin(2*pi*f*t_bit);
%show modulated signal%
basebandNRZ=(2*baseband-1);
modulated_signal=transmitterCarrier.*basebandNRZ
modulated_signal = 1×1000000
1.2458 1.2458 1.2458 1.2458 1.2458 1.2458 1.2458 1.2458 1.2458 1.2458 1.2458 1.2458 1.2458 1.2458 1.2458 1.2458 1.2458 1.2458 1.2458 1.2458 1.2458 1.2458 1.2458 1.2458 1.2458 1.2458 1.2458 1.2458 1.2458 1.2458
sigma2=1/10^(k/20);
noise=sigma2*randn(1, length(modulated_signal));
noisy_modulated_signal=modulated_signal+noise;
demodulated_data=[];
carrier_receiver=sin(2*pi*f*t_bit);
for n=ss:100*ss:length(noisy_modulated_signal)
demodulated_signal=carrier_receiver.*noisy_modulated_signal((n-(ss-1)):n);
z=t_bit*trapz(demodulated_signal);
zz=round((2*z/bp));
if(zz>0)
a=1;
else
a=0;
end
demodulated_data=[demodulated_data a];
end
you can use normalize the dimensions of two vectors transmitterCarrier, basebandNRZ before multiplying them together

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