ng dng x l tn hiu chotruyn thng Ultra-Wideband HCVINCNGNGHBUCHNHVINTHNG KHOAVINTHNGI Gio vin hng dn: Ths.Nguyn Phi Hng Ks. Bi Vn Ph Sinh vin thc hin : V Thanh Tng ti Ni dung Phn I: Tng quan v h thng UWB Phn II : Truyn thng UWB Phn III: nh gi v h thng UWB Phn I: Tng quan v h thng UWB nh ngha tn hiu UWB Cc thuc tnh ca tn hiu UWB Cc lnh vc ng dng UWB l g? Theo FCC UWB c nh ngha: T s bng tn: Bng tn ti thiu l 500MHz To, thu pht v x l cc xung c rng cc nh(c ps) Thut ng khc:impulse radar, impulse radio,carrier-less, carrier-free, base-band, time-domain 2 0.2H LH Lf ff f>+Lch s pht trin cng ngh UWB 2002 Bo co v quy nh u tin ca FCC cho cc h thng UWB1998 Thng tin quy nh ca FCC i vi cc h thng UWB1994 Cc chng trnh truyn thng UWB khng phn loi u tin 1990 nh gi cng ngh UWB1986 H thng truyn thng UWB da trn xung ngn c a ra bi Ross v Fontana 1978 Ross v mt s ngi khc ln u tin trnh by v h thng truyn thng UWB 1965 Ross pht trin cng ngh UWB ti trung tm nghin cu Sperry Cui 1950 xut hin nhu cu phn tch p ng xung ca sng vi ba ( ti phng th nghim Lincoln, Sperry, ) 1893 Hert s dng b pht xung cho cc th nghim vt l. Cc c tnh ca tn hiu UWB Mt n ph cng sut do FCC a ra Tn hiu UWB c ph nm trong phm vi t 3,1- n 10,6-GHz. Ptx (max)= -41,3 dBm/MHz hay 0,5 mW nu s dng ton b di tn 7,5 GHz 10. 6 GHz1. 99GHz1. 61GHz0. 96GHz-70-40-801 2 3 4 6 5 7 8 9 10-50-60Tn s [GHz]Cc mc bc x EIRP ca UWB [dBm]3.1 GHzMin tn s chnh phc v cho cc ng dng truyn thng UWB Xung Gaussian : 221 ( )( ) exp ( )22xxxt d p tp t p tdt oto| | = = |\ . Mt ph cng sut: 22( ) (2 ) .exp( (2 ) )xxpf f f t to = Mu xung v mt ph tng ngCc c tnh ca tn hiu UWB Chui xung v mt ph tng ng Cc c tnh ca tn hiu UWB Thi gian [ns]Tn s [GHz] Thi gian [ns] Tn s [GHz] 1. Tc cao 2. Khng cn cc thit b trung tn: Kch c thit b nh Gi thnh thit b thp Gim cng sut tiu th 3. Chng a ng4. o c (nh v) v truyn thng trong cng mt thi im. 5. M ra mt hng s dng hiu ph tn m khng cn phi cp php Cc c tnh ca tn hiu UWB Cc u im ca UWB log 1SC BN| |= + |\ .ChunTc (Mb/s) UWB (khong cch c1 m),USB 2.0 480 UWB (khong cch c4 m)200 UWB (khong cch c 10 m)110 Fast Ethernet90 802.11a54 802.11b11 Ethernet10 Bluetooth1 Cc c tnh ca tn hiu UWB Biu thc Shannon Tc d liu cao ng sau mt ln phn xng sau hai ln phn xng nhn thngB thuB phtCng sutT(tr)Cc c tnh ca tn hiu UWB Mi trng truyn c tnh chng a ng Chng lnKhng chng ln Cc c tnh ca tn hiu UWB Hin tng chng ln xy ra khi:pdt TcAA= s Phm vi hot ng nh: ch thc s hiu qu trong phm vi 10 m X l tp m v nhiu phc tp Cha c s thng nht gia cc tiu chun ng b kh khn Cc c tnh ca tn hiu UWB Cc nhc im v thch thc ca UWB Cc lnh vc ng dng Cc mng WPAN (Wireless Personal Area Network)Mng cm bin (sensor network) Cc h thng chp nh Cc h thng radaCc lnh vc ng dng Cc mng WPAN Dch v bng rng: cp quang, v tinh, xDSL, v,vHome gatewayMy inComputerMy nh sLactopTVPDAMy faxBn phmChutin thoi cm tayKt ni UWBPhn II: Truyn thng UWB Cc phng php iu ch K thut a truy nhp B thu pht Cc phng php iu ch iu ch bin xung (PAM)Kho bt tt (OOK)1100 0011iu ch xung trc giao (PSM)iu ch v tr xung (PPM)Kho chuyn pha nh phn (BPSK)11000011 iu ch v tr xung (PPM) pT t > 10 Thi gian Tp pT t