實(shí)驗(yàn)二-2ASK調(diào)制解調(diào)

1、實(shí)驗(yàn)二-2ASK調(diào)制解調(diào)實(shí)驗(yàn)二2ASK調(diào)制解調(diào)仿真學(xué)院(院、系)專業(yè)班通信原理課程學(xué)號姓名實(shí)驗(yàn)日期教師評定一、實(shí)驗(yàn)?zāi)康?.熟悉2ASK調(diào)制解調(diào)原理。2. 掌握編寫2ASK調(diào)制解調(diào)程序的要點(diǎn)。3. 掌握使用Matlab調(diào)制解調(diào)仿真的要點(diǎn)。二、實(shí)驗(yàn)內(nèi)容1.根據(jù)2ASK調(diào)制解調(diào)原理，設(shè)計(jì)源程序代碼。2. 通過Matlab軟件仿真給定信號的調(diào)制波形。3. 對比給定信號的理論調(diào)制波形和仿真解制波形。三、實(shí)驗(yàn)原理1. 2ASK二進(jìn)制振幅鍵控(2ASK)信號碼元為：S(t)=A(t)cos(w0t+9)0vt=3M=500;t=(0:M-1)/M/f;carry1=repmat(A*sin(2*pi*f*t

2、),1,Q);Lcarry1=length(carry1);carry2=kron(ones(size(m),carry1);ask=kron(m,carry1);N=length(ask);tau=(0:N-1)/(M-1)/f;Tmin=min(tau);Tmax=max(tau);T=ones(size(carry1);dsig=kron(m,T);figuresubplot(3,1,1);plot(tau,dsig);title(eyx?D?o?)axis(TminTmax-0.21.2)subplot(3,1,2);plot(tau,carry2);title(?Di2-D?)axi

3、s(TminTmax-1.2*A1.2*A)subplot(3,1,3);plot(tau,ask);title(?-1y2ASK-?oo?2-D?)gridonaxis(TminTmax-1.2*A1.2*A)sig_mul=ask.*carry2;figuresubplot(4,1,1);plot(tau,sig_mul);title(D?o?a3?oo?2-D?)s);axis(TminTmax-0.21.2)Ord,omega_c=buttord(4*pi*f*0.6,4*pi*f*0.8,2,30,num,den=butter(Ord,omega_c,s);h=tf(num,den)

4、;x=lsim(h,sig_mul,tau);subplot(4,1,2);plot(tau,x);title(?2oo頭?2D?axis(TminTmax-0.30.8);th=0.25;t_judge=(0:Lm-1)*Lcarry1+Lcarry1/2;y=(x(t_judge);y_judge=1*(y=th)+0*(y=th);y_value=kron(y_judge,ones(size(carry1);n_tau=tau+0.5/F;subplot(4,1,3);plot(n_tau,y_value);title(3e?u2?oo?eyX?D?o?2-D?axis(min(n_tau)max(n_tau)-0.21.2)subplot(4,1,4);plot(tau,dsig);title(?-e?D?o?2-D?6?2ASK?a?o6?D?o?x+?士倉axis(TminTmax-0.21.2)end七、MATLAB繪制波形八、實(shí)驗(yàn)總結(jié)和心得經(jīng)過這一次實(shí)驗(yàn)，我懂得了2ASK調(diào)制解調(diào)原理以及更深一步掌握了Matlab調(diào)制解調(diào)仿真的操作，非常開心。不過還有還多值得注意的地方，比如說在subplot描繪中，常常遺漏plot,忘了畫出調(diào)制后的圖形。同時也在設(shè)置坐標(biāo)范圍時出現(xiàn)了一點(diǎn)小錯五，不過借助MATLAB的糾錯系統(tǒng)還是順利完成了，但