mpsk.m

simulation of mpsk modulation technick and demonstation of constellation in noisy arean and non-noi

clear all;
clc;
k=6;
M=2^k;
Fs=200;
Fd=1; % baud - symbol/second
N=1000; %num of symbol
Ts=1/Fd; %time of sym
Es=1; %symbol's energy
A=sqrt(2*Es/Ts); % amplitude
fc=2;
SNR=25;
sig=randint(1,N,M); % randomize  numbers 0-31 
t=0:1/Fs:Ts;
for n = 1:4; %number of symbols
    s=A*cos(2*pi*fc*t).*cos(2*pi*sig(n)/M)-A*sin(2*pi*fc*t).*sin(2*pi*sig(n)/M);
    plot(t,s);
    title(['The modulated signal in time domain(Wave form for ' num2str(M) '-PSK)']);
    xlabel('time[sec]');
    ylabel('Amp[volt]');
    hold on;
    t=t(length(t)):1/Fs:t(length(t))+Ts;
end
mod_sig=pskmod(sig,M);
scatterplot(mod_sig);
noisy=awgn(mod_sig, SNR);
scatterplot(noisy);
title('constellation of 32 psk with noise');
demod_sig=pskdemod(noisy,M);
[number_of_err, SER]=symerr(sig,demod_sig);
BER_sym=SER/k;
SER_sym=SER;