Matlab语言写的PCM_ASK_FSK_DPSK通信系统

通信原理实验课上写的代码，PCM 部分参考了网络部分的资源，做了些改变。基本上包含

了 PCM 编码，FSK，ASK，DPSK 的调制与解调。有助于大家理解通信系统。代码用

MATLAB 编写，希望大家能够多提意见。

Email: jackafx@126.com

欢迎大家多提意见

实验一：

1)

t = 0:0.001:2; % give ten time units

plot(t,Signal);

title('sin(2*pi*t) + 0.5*cos(4*pi*t)');

subplot(3,1,2)

stem(ts,Sign_m);

title('4HZ 采样波形');

subplot(3,1,3);

plot(ts,Sign_m);

title('抽样序列回复出的原始信号');

grid;

运行后图形如下:

%====================================================================

clear;

A = 4; % chage the amplitude, you will get different figures

t = 0:0.001:1; % give ten time units

x = 0 : 0.001 : 1;

Signal_m = A * sin(2*pi*x); % give a singn signal

subplot(2,1,1);

plot(t,Signal_m);

title('Input SIN Singal');

grid;

%---------------------------------The Polarity Code-----------------------------------

for i = 1:Len

if(Is(i) > 0)

Code(i,1) = 1;

end

%----------------------------------段落码----------------------------------

%- 一个 for 循环可以解决问题了

for j = 0 : 7

sign_temp = sign_temp / 2;

if sign_temp < 8

break;

end

end

bin_temp = dec2bin(j,3);

temp = num2str(bin_temp, 3);

% ---------------------------------段内码---------------------------------

Start_Level = [0,16,32,64,128,256,512,1024]; %段落起点电平

Quan_Interval = [1,1,2,4,8,16,32,64]; %段落量化间隔

ParagraphN = zeros(1,Len);

for i = 1:Len

end

for i = 1:Len

Cur_LHJG = Quan_Interval(ParagraphN(i));

dec_temp = ZeltaLevel/Cur_LHJG;

%====================================================================

===

% >>>>>>>>>>>>>>>>>>>>>>>>>>>>coding part<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

%====================================================================

ParagraphN(i) = Code(i,2)*4 + Code(i,3)*2 + Code(i,4) + 1;

Quan_Unit(i) = Code(i,5)*8 + Code(i,6)*4 + Code(i,7)*2 + Code(i,8);

Mark(i) = Start_Level(ParagraphN(i));

Quan_Value(i) = Quan_Interval(ParagraphN(i));

sign = 1;

if(Code(i,1) == 0)

sign = -1;

end

Signal_trans(i) = sign * (Mark(i) + Quan_Value(i) * Quan_Unit(i));

title('PCM Coding Signal');

grid;

%===================================================================