通信原理課后答案(完整)

經(jīng)典word整理文檔，僅參考，雙擊此處可刪除頁眉頁腳。本資料屬于網(wǎng)絡(luò)整理，如有侵權(quán)，請(qǐng)聯(lián)系刪除，謝謝！1logpxlog()Ip(x)22E和XI(E)2I(X)21，T()RTB1px()log()nn()logpxHpxp(x)i2i2ii1i1i11110.4log0.3log0.2log0.1logH0.40.30.20.122220.1/HRHR1.846510001.8465kb/sTbBT1R2000BaudB2TRR2000B4B2R4R/sb42B4833106Ts36sT861R400B8T8R8R/sb82B8s/Rb2RB2RR3600B8B2R8R/sb82B8/Rb4s1RB4R1200b4log42Ts30分鐘內(nèi)錯(cuò)誤碼元數(shù)21630分鐘內(nèi)總的碼元數(shù)18001200P＝104e，1200P5ReBT時(shí)間內(nèi)錯(cuò)誤碼元數(shù)360P＝105T時(shí)間內(nèi)總的碼元數(shù)T1200e360T＝310(s)510(min)4212001050dK和ts0dH(He()Ke)00dy(t)s(t)h(t)Ks(tt)0d)cosTeH，其中，td0d號(hào)sH)cos]d01dj01ejted2d02d012)))dd0d011s(t)s(t)h(t)s(tt)s(ttT)s(ttT)22odd0d0此信道H)1cosT)t0dH解:R傳輸特性：H)2RR12R2：)幅頻特性HRR12：)0相頻特性d)群遲延特性：)0d1傳輸特性：H)相頻特性：)1jRC)RCd)RC群遲延特性：)dRC1222))和Δ為2n1f(2n(kHz)2nf2n(kHz)n11B(kHz)3C11m(~)BB53CT(3~5)(9~15)(smP(x)P(x)1/212））x1y161/43/4x2y2圖111H(X)(loglog)bit/符號(hào))2212222111H(X/Y)(loglog)0.930(bit/符號(hào))6416422(2)RR[H(X)H(X/Y)]10000.930)70(bit/符號(hào))bBSCB)424(kbit/s)32N2C24(kbit/s)Rb0PeS45.56.5CBlog)6.5106log)6.5106319.5(Mb/s)2nB02/N30dBSS/NSCB(1)(1)N22SCB(1)N2SSS(1)lg(1)lg(1)NNN2S4.81NSdB)N5105(6416)10(bit)210510510(bit)56100510510(bit/s)Rb68R510(bit/s)需要的信道容量為：C8b）S/N101000C5108B50(MHz)S3.32lg1001log)2NH)K)t0d(t)K和ts0dH(He()Ke))jjtd0h(t)K(tt)0dy(t)s(t)h(t)Ks(tt)0d)cosTeH，其中，tjtd0d(t)號(hào)sH)cos]Tejtd01ejt(eej0)ejtdd21j01ejtej(tT)ej(tT)d2d02d01212h(t)tt()(ttT)(ttT)dd0d011220d0odd此信道H)1cosT0()KHR21212d11jRC)d)22Δ為2n1f(2n(kHz)2nf2n(kHz)n11B(kHz)3C11m(~)BB53CT(3~5)(9~15)(smP(x)P(x)1/212））x1y161/43/4x2y2圖111H(X)(loglog)bit/符號(hào))2212222111H(X/Y)(loglog)0.930(bit/符號(hào))6416422(2)RR[H(X)H(X/Y)]10000.930)70(bit/符號(hào))bBSCB)424(kbit/s)32N2C24(kbit/s)Rb0PeS45.56.5CBlog)6.5106log)6.5106319.5(Mb/s)2nB02/N30dBS/NSSCB(1)(1)N22SCB(1)N2SSS(1)lg(1)lg(1)NNN2S4.81NSdB)N(6416)10(bit)210510510(bit)56100510510(bit/s)68需要的信道容量為：C8b）CBS3.32lg1001log)2Ngt1p：（2gt圖aTsf1T？ss22ss12s1s2ssgtgtgt122Pf4fpp)G(f)f(12p)2G(mf)δ(fmf)2sssssgtGf2()δ()fsP(f)4fpp)G(f)f(12p)2G2sssss4fpp)|G(f)|f(2p|G()|2222sssmT1ts2gt0其它則gtGf為GfTSa(Tf)sssin＝TSa(Tf)TSa()TGf0ssssss1TfssT1ts4gt0其它Tf＝TSa(則gtGf為Gfs)s22sinTfTT2Gf＝Sa()Sa()T0ssss2222ss21Tfss3碼1碼133碼1碼V13H2T題圖R1TBs2iHHTTsiss2RTBs4iTsis2BRB2n1,2,3，RTBBB12））RTBBs32RTTBss22TTBss12）RTTBBssR210(Baud)R10(Baud，n2）R33B210(Baud)R10(Baud，n2R33B10(Baud)R10(Baud，n1）R33B32(Hz)3R＝0.5(B/)B33(Hz)3＝B/Hz)B3(Hz)3＝B/Hz)BBSa(x)t(x)t4-24xtx18，x13，x1，x14，x120xtyt11xtD2xk，xNki111243121111yCxCx1338722110211111yCxCxCx11()3348321100111115yCxCxCx11()011001yCxCxCx1()1444811201101yCxCx1()01644202111643ytyk161111y(0)524723248644801713D。yk和和20213)))))fP)sfP)Tesf0s圖f。sabcd1+0S)Bff2f25000。21sab}nn；。n0s)012Perfc(r)）2e112r210'2(1P)P）PPeeeeP1P'2P8106eee11Pee2.27105e22805nBN021Perfc(r/2)10e552為：，信號(hào)幅度為：，，誤碼率都保持在時(shí)，即相干解調(diào)501r，查表求得522，信號(hào)幅度為：，NnB10W410W85021Perfc(r)10e552。)Ato的Preef300Hzmt)m(t)）f的sssT1M(f)MTssssnnf1/T300HzMsssn（2fssn)H、m1）3fm(t)）fs1s）H2s)）MHf1111H21()H()1()()mtmt。H012s1、mt)9AtA10Vmt)v。N2A240256v0.5(V)N640、A1）763551233227I7351233216624，sCCCCCCCC12345678、A為1））7CCCCCCCCC123456781CCC6234CCCC65567I8(2564168)3280I(2563168)3120）對(duì)8為Hz11(s)f，可知抽樣間隔TsfsT1(s)T83108000011T1(s)T3380000240000b1T(s)240000b1B120(kHz)。24kHz8kHz；）8）。若4kHz。3400HzfmSNdBoq25SN，所以編碼位數(shù)N5時(shí)，對(duì)應(yīng)的碼元速率為2Noq3400Hz頻率f，則最小抽樣頻率為。當(dāng)NmRR5680034000(Baud)2Baud/HzBBBmaxR17000Hz17kHz。BB2實(shí)踐項(xiàng)目、用sin(200t)200t）低通抽樣。有一信號(hào)s(t)sa(200t)[22f100Hzf200Hz，12）帶通抽樣。有一信號(hào)f10Hzf20Hz，120t時(shí)，sin(0.2A律xyy0與7位習(xí)題()()cos()sintstmt()sin()cos[()]tmtcc()()cosstmttmttrttctccm(t)t)mt)m2t)，t()arctanr2m(t)et)st)rt)cost(t)]222c1rtcos2[t(t)]}22c()(tettct)m(t)、m(t)與s()()cosmt()sintmtttcccccccccc111t2tt12ta2t222ccc111tt2tt2ta2t22222cccamt2ccccvttsintmtcostmtsintasintasintccccc111tsintt1cos2ta1cos2t222ccc111attsintamtacos2t2222cc1a22為105Q10。vtanffv00c當(dāng)1050fHZfc051106fv00()stsinttt1c22cs(t)sintQAtttt11cc22cc1AAQcostcos12112s(t)sintQ'Atttt211cc22cc2AA＋cos122221212(a)b)(a)123n1234567t2t4t6t7tttttn2n1234567t2t4t6t7t13tttb(a)傳ffccf221cm12cr2(d)圖1DF的7表F的DEF10001011000110；。4）d。）））3和；））1n為r214nrnrrknr11nn154、、、4SSSS4r1234、S、S、SS1234134134aa08aa19aa2aa3aa4aa5aa6a7、S、S、SS1234Saaaaaaaa13891011121314Saaaaaaaa2256711121314Saaaaaaaa314679101314Saaaaaaaa40457810121400004令SSSS312aaaaaaaa3891011121314aaaaaaaa256711121314aaaaaaaaaaaaaa045781012141001110G0100111））；））7k3，r4A(a6,a5,a4)?G，知n以，；GQQHP,I，PHT1101100010r