用matlab对象进行数字基带调制解调（M-DPSK）
<font face="Times New Roman">%% 仿真实现基带M-DPSK调制与解调%% 利用Matlab modem object
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% h = modem.dpskmod(property1, value1, ...)
% h = modem.dpskmod(DPSKdemod_object)
% h = modem.dpskmod(DPSKdemod_object, property1,value1, ...)
% h = modem.dpskmod
% if you have creat an object h for DPSK modulate, then the method
% 'modulate' can be used to modulate your signal x such as:
% y = modulate(h, x)
% and demodulation method need to creat an object
% h = modem.dpskdemod(property1, value1, ...)
% h = modem.dpskdemod(DPSKmod_object)
% h = modem.dpskdemod(DPSKmod_object, property1,value1, ...)
% h = modem.dpskdemod
% if you have creat an object h for DPSK demodulate, then the method
% 'demodulate' can be used such as
% y = demodulate(h, x)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
clc
clear all
close all hidden
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
M = 4; % The order for modulate of DPSK
nPacket = 5000; % The signal length
x = randint(nPacket,1,M); % Signal for modulate
h = modem.dpskmod('M',M); % Creat an object of DPSK modulation
y = modulate(h,x); % modulate x get y
scatterplot(y);
yn = awgn(y,15,'measured'); % Pass the gauss channel with SNR=15dB
scatterplot(yn);
reset(h);
h = modem.dpskdemod('M',M);
z = demodulate(h,yn);
= symerr(x,z)
%% Process rectanglar pulse shaping
Nsamp = 4; % Oversampling rate
ypulse = rectpulse(y,Nsamp);
ynoisy = awgn(ypulse,15,'measured');
ydownsamp = intdump(ynoisy,Nsamp);
scatterplot(ydownsamp);
reset(h);
h = modem.dpskdemod('M',M);
z = demodulate(h,ydownsamp);
= symerr(x,z)</font>转自：http://blog.sina.com.cn/s/blog_5def5a660100j3b9.html
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