数字中频,零中频,直接变频接收机的结构和接收原理

00591,,,,,:,,,,()[1](DSP)MCM(muti-chipmodule)(ASIC),,[1](),,,,DSP,,,,,,,,(digitalIF)(di2rectconversion)(zero-IF),(softwareradio),,,,RF,IF[3],DSP,1DSP(DDS)(DDC)(DF)(multi-rate)2219991©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.1,,:(),,:fs=4fIF2k-1(1)fIF,,fs,fIF,k,,fsDSPRFöIF,,,,,,AöD,ASICStanfordTelecomStel-2000A,()fLfc,,2,,D,IiRF,2,,,,DSP,,,AöD,,,,,PLLRFIF,,3219991©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,IQ()450MHz900MHz,,,[2]3,RF,,,,,3,,3,IQ(),(),,RFIFAöDDöA,AöDDöA,AöDDöA(),,,,AöDDöA,,AöD,,,,,,,AöD,,1H.MeyrandR.Subramanian,AdvancedDigitalReceiverPrinciplesandTechnologiesforPCS,IEEECommun.Mag.,Jan.1995,pp.68782M.Vidmar,23cmPSKpacket-radioRTXfor1.2Mbitösuseraccess,http:öö©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.