擴頻通信系統(tǒng)仿真-移動通信實驗報告畢業(yè)論文(編輯修改稿)
2025-07-21 23:06 本頁面
【文章內(nèi)容簡介】 ignal_awgn=channel(signal_bpsk,snr)signal_awgn=awgn(signal_bpsk,snr)。② 函數(shù)輸出signal_awgn為加載了高斯白噪聲后的信號函數(shù)輸入snr為噪聲信噪比5，解擴① 代碼：function signal_reverseSpread=ReverseSpread(signal_awgn,PNCode,fc,fb,N)PNCode_spreading=[]。for i=1:length(PNCode) for j=1:16*fc/fb PNCode_spreading=[PNCode_spreading,PNCode(i)]。 endendPNCode_spread=[]。for i=1:N PNCode_spread=[PNCode_spread,PNCode_spreading]。endy=PNCode_spread.*signal_awgn。 %%%%fs=59520hz fstop1=2120hz fpass1=3600hz fpass2=3820hz fstop2=5320hzload Bandpass。den=1。y=[y,zeros(1,length(BandNum)/2)]。signal_reverseSpread=filter(BandNum,den,y)。signal_reverseSpread=signal_reverseSpread(length(BandNum)/2+1:end)。② 函數(shù)輸出signal_reverseSpread為解擴后的信號函數(shù)輸入PNCode為擴頻碼,fc為載波頻率,fb信息的比特率,N信息流長度③ 直接式解擴相關(guān)波形參考圖：6，BPSK解調(diào)① 代碼：function signal_demodulation=BPSKDemodulation(signal_reverseSpread,fb,fc,N)carrier=[]。t=1/(fc*16):1/(fc*16):1/fc。 for i=1:length(signal_reverseSpread)/16 carrier=[carrier,cos(2*pi*fc*t+pi/2)]。endx=signal_reverseSpread.*carrier。%%%% fs=59520hz fpass1=1240 fstop1=2400load Lowpass。den=1。signal_demo=filter(LowNum,den,x)。signal_demodulation=[]。for i=(16*3*31/2):(16*3*31):(length(signal_demo)16*3*31/2) if signal_demo(i)0 signal_demodulation=[signal_demodulation,1]。 else
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