gmsk調(diào)制與解調(diào)系統(tǒng)的設(shè)計說明(存儲版)
【正文】 。ruili_error39。)。TracebackLength=4。 y(i)=xErrorRate(1)。最后通過對GMSK系統(tǒng)調(diào)制、解調(diào)信號的波形、頻譜圖、眼圖和誤碼率曲線的分析驗證了GMSK系統(tǒng)良好的性能。結(jié)果表明:,BT==。 GMSK調(diào)制信號眼圖 BT=分析：由圖中混亂的線條可知，BT=，眼圖“眼睛”睜開很小，失真嚴重，系統(tǒng)碼間串擾較大。在系統(tǒng)中要求通過m文件編程繪制誤碼率曲線。示波器scope1的number of axes 為2表明有縱坐標個數(shù)為2；time range表示時間軸的顯示范圍，設(shè)為auto,表示時間軸的顯示范圍為整個仿真時間段。其前六項參數(shù)與GMSK調(diào)制器相同，并設(shè)置的值也相同。BT=。其中probability of a zero ；Initial seed 為61表示隨機數(shù)種子為61；sample time為1/。前置濾波器以高斯型最能滿足上述條件，這也是高斯濾波器最小移頻鍵控(GMSK)的由來。：誤碼率計算模塊信號產(chǎn)生模塊頻譜儀示波器解調(diào)模塊信道調(diào)制模塊 GMSK調(diào)制與解調(diào)系統(tǒng)原理框圖在設(shè)計中，選用貝努力二進制序列產(chǎn)生器來產(chǎn)生器（Bernoulli Binary Generator）產(chǎn)生一個二進制序列，將序列送入GMSK基帶調(diào)制器模塊（GMSK Modulator Baseband）中得到已調(diào)信號，再將已調(diào)信號送入一個加性高斯白噪聲信道，將信噪比設(shè)為一個變量，用于繪制信噪比——誤碼率曲線。由于濾波形成的高斯脈沖包絡(luò)無陡峭的邊沿，亦無拐點，所以經(jīng)調(diào)制后的已調(diào)波相位路徑在MSK的基礎(chǔ)上進一步得到平滑，它把MSK信號的相位路徑的尖角平滑掉了，因此頻譜特性優(yōu)于MSK和SFSK。數(shù)字調(diào)制解調(diào)技術(shù)是數(shù)字峰窩移動通信系統(tǒng)空中接口的重要組成部分。關(guān)鍵詞：GMSK，瑞利信道，SimuLink仿真，誤碼率曲線Abstract Gaussian filtering minimum frequency shift keying (GMSK) the characteristics of the System is in the MSK (minimum frequency shift keying) modulator before insert gaussian lowpass preset System filter to preset System filtering, so GSMK modulation signal spectrum pact, error characteristics, in the digital Mobile munication has been widely used, such as now widely used GSM (Global System for Mobile munication) Mobile munication System is to use GMSK modulation mode. This paper mainly in the Rayleigh channel, through the Simulink in Matlab building simulation model simulation. And through the observation GMSK modulation and demodulation system signal waveform and spectrum diagram, eye diagram and bit error rate curve, which testified GMSK system is relatively good p
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