arrays have incompatible sizes for this operation help me PLZ

Question

Mahra Albadi 2021-11-14

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1586519-arrays-have-incompatible-sizes-for-this-operation-help-me-plz

评论： Mahra Albadi 2021-11-28

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

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

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Answer 1

VBBV 2021-11-18

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1586519-arrays-have-incompatible-sizes-for-this-operation-help-me-plz#answer_834239

在 MATLAB Online 中打开

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