[MATLAB通信系统] 毕设题目：基于chirp函数的UWB脉冲设计与频谱分析

[清风晴云]

这是有关毕设课题的程序，要求是生成chirp函数的时域和频域图，但我Matlab只是入门级别，也不会编，望熟悉这方面的人能帮忙看看这段程序的问题，谢谢！



A = 1; % pulse amplitude [V]
smp = 1024;
Tmin = -4e-9;
Tmax = 4e-9;
N = smp;
f0 = 3e+9;
Tc = 10e-9;
Bc = 300e+6;
miu = Bc/Tc;
N >= (5e+8)/Bc;
n = 0:N-1;
t=linspace(Tmin,Tmax,smp); % Inizialization of the time
% axischirpchirp

% --------------------------------------------
% Step One - Pulse waveform in the time domain
% --------------------------------------------

% Pulse waveform definition

pulse = A.*cos(2.*pi.*(f0+n.*Bc).*t+pi.*miu.*t.^2);

% -------------------------------------------
% Step Two - Analysis in the frequency domain
% -------------------------------------------

dt = Tc / smp; % sampling period
fs = 1/dt % sampling frequency
N = smp; % number of samples (i.e.
% size of the FFT)
df = 1 / (N * dt); % fundamental frequency

X=fft(pulse,N); % double-sided MATLAB
% amplitude spectrum
X=X/N; % conversion from MATLAB
% spectrum to Fourier

X1=fftshift(X);

% -----------------------------
% Step Three - Graphical output
% -----------------------------
% Time Domain Representation
figure(1);
PT=plot(t,pulse);
set(PT,'LineWidth',[2]);
AX=gca;
set(AX,'FontSize',12);
T=title('时域');
set(T,'FontSize',14);
X=xlabel('时间 [s]');
set(X,'FontSize',14);
Y=ylabel('幅度 [V]');
set(Y,'FontSize',14);
hold on
% Frequency Domain Representation
figure(2);
f=linspace((-fs/2),(fs/2),N);
PF=plot(f,abs(X1));
set(PF,'LineWidth',[2]);
AX=gca;
set(AX,'FontSize',12);
T=title('频域');
set(T,'FontSize',14);
X=xlabel('频率 [Hz]');
set(X,'FontSize',14);
Y=ylabel('幅度 [dB]');
set(Y,'FontSize',14);
hold on