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【MATLAB】MATLAB 仿真数字带通传输系统 — QPSK 和 OQPSK 系统
2022-07-04 03:55:00 【嵌入式职场】
目录
1、QPSK 和 OQPSK 系统
clear all;
clc;
close all;
fc = 5; %载频
N_sample = 16;
N_num = 100; %码元个数
dt = 1/(fc*N_sample);
Ts = 1; %码元间隔
t = 0:dt:(N_num*Ts-dt);
T = dt*length(t);
d1 = sign(randn(1,N_num)); %双极性码
d2 = sign(randn(1,N_num)); %双极性码
gt = ones(1,fc*N_sample); %NRZ 波形
%QPSK 调制方式
s1 = sigexpand(d1,fc*N_sample);
s2 = sigexpand(d2,fc*N_sample);
b1 = conv(s1,gt); %双极性 NRZ 波形
b2 = conv(s2,gt); %双极性 NRZ 波形
s1 = b1(1:length(s1)); %同相基带信号
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