Compare two graphs on same plot

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Nathan Jaqua
Nathan Jaqua 2020-3-21
回答： Sriram Tadavarty 2020-3-21
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);

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采纳的回答

Sriram Tadavarty
Sriram Tadavarty 2020-3-21
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

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