Compare two graphs on same plot

We are working with BPSK Demodulation. I want to plot the btilda and bhat variables in this code on the same graph so I can compare them. Does anyone know how to do that?

code:

%% This file will simulate BPSK 

clc
clear all;

% generate logical data bits 
nb = 25;
c = 2*(randn(nb,1) > 0)-1;  % generate random 25 bits 

% BPSK modulation 
Fs = 5e3;   % sampling frequency for signal representation
Ts = 1/Fs;  % sampling period
T = 1e-2;   % symbol period 
fc = 1e2; % carrier frequency
phi = 0;    % phase offset

% time vector 
t = 0:Ts: nb*T - Ts;
% Modulate the data bits to BPSK signal
[x,xc,btilda] = BPSK_MOD(c, fc, phi, T, Ts);

% plot the data, carrier, and modulated signal
figure;
subplot 311; plot(t, btilda); title('Information bits');
ylabel('amplitude'); xlabel('time');
subplot 312; plot(t, xc); title('Carrier Signal');
ylabel('amplitude'); xlabel('time');
subplot 313; plot(t, x); title('BPSK modulated Signal');
ylabel('amplitude'); xlabel('time');

% AWGN channel noise
SNR = 10;
sigma = 10^(-SNR/20);    % noise standard deviation
noise = sigma*randn(size(x));
x = x + noise;

% receiver processing.
bhat = BPSK_DMOD(x, fc, phi, Ts); 
bRcvd = receivedSignalBitEst(bhat, T, Ts);

% plot the received signal, noise, and demodulate it
figure;
subplot 311; plot(x); title('Received data signal');grid on;
subplot 312; plot(noise); title('Noise level ');grid on;
subplot 313; plot(bhat);title('Received data signal'); grid on;

% calculate number of bits in error
bErr = length(find((c(1:end-1) - bRcvd)~= 0));
fprintf('Total bits are in Error:  %d\n', bErr);

Answer 1

[Sriram Tadavarty]

Hi Nathan,

I assume both variables bhat and btilda have same length.

% Option 1
figure
plot(1:length(bhat),bhat,1:length(btilda),btilda)

% Option 2
figure
plot(bhat)
hold on
plot(btilda)

Hope this helps.

Regards,

Sriram