16qam_星形和矩形星座圖調(diào)制解調(diào)matlab代碼

1、%%%軟件無(wú)線電課程設(shè)計(jì)%%方形、星形16QAM調(diào)制解調(diào)仿真%%%%%主程序clcclear%%定義參數(shù)fd=25010^6%碼元速率250Mfs=250010^6%濾波器采樣率fc=250010^6%載波頻率2.5Gf=1000010^6%對(duì)載波采樣data_len=200000%數(shù)據(jù)長(zhǎng)度sym_len=data_len4%碼元序列長(zhǎng)度M_QAM=16%QAM數(shù)k=log2(M_QAM)SNR=1:12%白噪聲信噪比%%bit_tx=

2、rint(1data_len)%產(chǎn)生隨機(jī)序列echooffrec_qam16=QamMod(bit_tx16)%方形16QAM調(diào)制star_qam16=SrarQamMod(bit_tx)%星形16QAM調(diào)制base_rec=base_shape(fdfsfrec_qam16)%基帶成型濾波base_star=base_shape(fdfsfstar_qam16)%基帶成型濾波fi=1:length(SNR)%信噪比從1dB到12dB計(jì)

3、算誤碼率SNR_=i%方形映射16QAMrf_rec_qam16=CarrierMod(fcfbase_rec)%載波調(diào)制rf_rec_qam16_n=awgn(rf_rec_qam16SNR(i)measured)%加噪聲[rec_qam16_rxbase_rec_rx]=CarrierDemod(fdfsfcfrf_rec_qam16_n)%載波解調(diào)bit_rec_rx=QamDemod(rec_qam16_rx16)%MQAM解調(diào)

4、[num_qam16perr_qam16_rec(i)]=biterr(bit_txbit_rec_rx)%誤碼率qam16_data_rec(i:)=rec_qam16_rx%scatterplot(rec_qam16_rx)%星形映射16QAMplot(timag(base_rec_rx(t)))title(方形映射I路)subplot(413)plot(treal(base_star_rx(t)))title(星形映射Q路)sub

5、plot(414)plot(timag(base_star_rx(t)))title(星形映射I路)%基帶眼圖N1=20000Tn=ffdeye_rex=base_rec(1:N1)eyediagram(eye_rexTn4Tn)title(方形基帶眼圖)eye_star=base_star(1:N1)eyediagram(eye_starTn4Tn)title(星形基帶眼圖)%%接收端星座圖%scatterplot(qam16_dat

6、a_rec(12:))figure(Name方形16QAM接收端星座圖)fi=3:3:12subplot(22i3)plot(real(qam16_data_rec(i:))imag(qam16_data_rec(i:)).)xmax=5axis([xmaxxmaxxmaxxmax])title([Snr=num2str(SNR(i))dB])endfigure(Name星形16QAM接收端星座圖)fi=3:3:12subplot(22

7、i3)plot(real(qam16_data_star(i:))imag(qam16_data_star(i:)).)xmax=3axis([xmaxxmaxxmaxxmax])gridontitle([Snr=num2str(SNR(i))dB])end%%功率譜密度f(wàn)_plot%%誤碼率分析%16QAM誤碼率曲線figure(Name16QAM誤碼性能對(duì)比)%semilogy(SNRtheotheo_perr_qam16)%hol