arrays have incompatible sizes for this operation help me PLZ

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

Answer 1

[VBBV]

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

[Mahra Albadi]

I don't know how? can you do it? please!