bande di frequenza band hz elf30 - 300 af300 - 3 k vlf3 k - 30 k lf30 k - 300 k mf300 k - 3 m hf3 m...
TRANSCRIPT
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Bande di frequenza
BAND Hz ELF 30 - 300 AF 300 - 3 k VLF 3 k - 30 k LF 30 k - 300 k MF 300 k - 3 M HF 3 M - 30 M
BAND Hz VHF 30M-300M UHF 300M - 3 G SHF 3 G - 30 G EHF 30 G - 300G
•Wavelength, = c/f
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Metodi di accesso
• Multiplazione– Frequency Division Multiple Access (FDMA)– Time Division Multiple Access (TDMA)– Frequency Hopped Multiple Access (FHMA)– Code Division Multiple Access (CDMA)– Space Division Multiple Access (SDMA)– Packet Radio
• Duplexing– Frequency Division Duplexing (FDD)– Time Division Duplexing (TDD)
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Tecniche di accesso: spettro espanso
• Spread spectrum– frequency hopping
• Nata durante la II guerra mondiale, implementata meccanicamente
– direct sequence• Anni 50 e 60 per uso militare
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Confronto FH/DS
DS FHImplementazione Facile ComplicataTempo di aggancio Minore MaggioreRaggio di azioneindoor
Minore Maggiore
Consumo Minore Maggiore
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Packet Radio (PR)
• Risorse condivise• Pacchetti contenenti dati, indirizzo di partenza e di
arrivo ecc….• Messaggi di Acknowledgement (ACK/NACK)) • Probabilità di collisione tra pacchetti.• Ripetizione del messaggio in caso di NACK• Efficiente in caso di trasmissioni a “burst”
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Protocollo Aloha
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Classificazione• Paging
• Cordless– Ia generazione: accesso vincolato
– IIa generazione: accesso distribuito (limitato)
• Cellulare– Cella
– Base Station (BS)
– Mobile Switching Center (MSC)– Public Switching Telehone Network
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Sistemi Cellulari
• Divisione in celle– CLUSTER
• Problemi tipici– Handoff
– Interferenze co-canale
• Tecniche per aumentare la capacità– cell splitting
– cell sectoring
– zone microcell
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Metodi per aumentare la capacità
• S dipende dalla gamma di frequenza assegnata a un dato servizio
• Bisogna massimizzare Movvero
diminuire N
(aumentano le interferenze)
diminuire l’area della cella
(aumentano gli Handoff)
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Sequenza per l’attivazione di chiamata da Mobile
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Sequenza per l’attivazione di chiamata da BS
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STANDARD Analogici
• Advanced Mobile Phone System (AMPS)• Ext.Tot. Acc. Comm. System (ETACS)
– FM analogica, fD = 10 KHz, B=25 KHz, Bm=5 KHz
– Forward link (down link) 935-960 MHz– Reverse link (up link) 890-915 MHz
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Standard digitali
• Global System for Mobile – (GSM, EGSM)– DCS1800 (Digital cellular System)– PCS1900 (Personal Communication System)
• DCS1800• Interim Standard 95 (IS95)• Dig. Europ. Cordless Telephone (DECT)• Bluetooth
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Global System for MobileGSM
• Sistema di 2a Generazione (2G) che segue la filosofia ISDN (Integrated Service Digital Network
• Servizi forniti– Telefonia– Emergenze– Trasmissione dati (con bit rate da 300 a 9600 bps)– Servizi ISDN: SMS (160 / 7 bit ASCII); Cell Broadcast (avvisi
traffico, previsioni del tempo ecc.)
• Peculiarità:– Subscriber Identify Number (SIM), SIM+ID=attivazione– Crittografia
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Architettura di rete
BTS = Base Transceiver Station
BSC = Base Station Controller
gestione parziale handover
MSC = Mobile Switching Center
VLR = Visitor Location Register
uno per ogni MSC
HLR = Home Location Register
uno per tutta la rete
AuC = Authentication CenterFigura 3.1: Architettura del sistema GSM
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Interfaccia radio
• GSM– uplink 890-915 / down link 935-960 MHz
• DCS1800– uplink 1710-1785 / down link 1805-1880 MHz
• PCS– uplink 1850-1910 / down link 1930-1990 MHz
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GSM/DCS1800/PCS
• Frequency Division Duplex• FDMA/TDMA• Banda 200 kHz suddivisa tra 8 utenti TDMA• Absolute Radio Frequency Channel Number (ARFCN)• Canale fisico = ARFCN + numero di time slot• Frame= 8 TS + preambolo ecc. durata 4.6 ms• 51 frame formano una multiframe• 51 multiframe formano una superframe• 2048 superframe formano una hyperframe che è costituita
da 2715647 frame identificate da un Frame Number: serve a individuare il tipo di informazioni trasmesso nella frame
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GSM:Banda base
• Bit rate totale = 270.833 Kbps (Tb=3.692 s)• Bit rate per utente = 270.833/8=33,854 Kbps• Bit rate dati = 24,7 Kbps• Bit rate vocoder = 13.4 Kbps• Ogni TS contiene 156.25 Tb e dura 576.9 s • Ogni frame contiene 8 TS e dura 4.615 ms• Interleaving: 456 bit suddivisi in blocchi da 57 bit
trasmessi su 8 frame diversi• Crittografia: chiave cambiata ad ogni chiamata
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IS-95 (Interim Standard 95)
• Caratteristiche – area geografica USA
– convive con AMPS (transceiver duali)
– bit rate variabile (min 1200 / max 9600 bps)
– chip rate fisso (1.228 MHz)
– Processing gain 128
– Sincronismo BS tramite GPS
– Controllo continuo della potenza (effetto cattura)
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DECT (Digital European Cordless Telephone)
• Physical layer: FHMA/TDMA/TDD– 1880-1900 MHz (10 canali)– Bit rate = 1152 Kbps– Banda = 1.728 MHz (1.5*bit rate)– TS = 480 bit– 24 TS per frame (12 canali TX / RX)– 120 canali in totale– Frequency Hopping ad ogni TS– Modulazione GMSK– Pout = 10 mW
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Universal Mobile Telecommunication SystemUMTS
• Fino a 2 Mbps
• Accesso – canali asimmetrici: CDMA(1.228 Mcps)
• down stream (forward link) 1900-1920MHz
• up stream (reverse link) 2010-2025 ss
– canali simmetrici W-CDMA (3.84 Mcps)• down link 2110-2170 MHz
• up link 1920-1980 MHz
• UMTS Subscriber Identity Module (USIM)– Dati personali, firma elettronica, imponte digitali, dati biometrici
– Funzioni analoghe a carta di credito
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Sistemi di terza generazione (3G)
• 1G Analogico (solo audio) • 2G Digitale (Audio + dati)• 3G Multimediale
– Audio– Dati – Immagini– alta velocità di trasmissione– Link asimmetrici + commutazione di pacchetto
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Wireless di terza generazione
• Prima generazione– modulazione analogica– solo voce– tanti standard
• Seconda generazione– modulazione digitale– voce, SMS, fax, dati
(9,6kbps)– pochi standard
• Terza generazione– voce, musica, immagini,
dati (2Mbps), internet– standard universale
GSMGSMGPRSGPRSEDGEEDGEUMTSUMTS9,6kbps 115kbps 384kbps 2Mbps9,6kbps 115kbps 384kbps 2Mbps
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Bluetooth• Connessione di periferiche senza cavo
– in modo affidabile– sicuro– a basso costo– ad alta compatibilità
• Applicazioni– telefonia cellulare– video e foto-camere– PC e periferiche– palmari – riproduttori audio (es. lettori MP3)
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Generalità
• Nasce alla Ericsson nel 1994 come– accessorio per cellulare di tipo
• low cost/low power/ short range
• Special Interest Group
• Specifiche pubblicate nel 1998
• Realizza le Personal Area Network (PAN)
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» Piconet pag 64 seminario Agilent
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– SCATTERNET pag 65 seminar
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Physical layer• Banda ISM (2.402-2.480 GHz)• Larghezza di canale = 1 MHz (79 canali)• Modulazione GFSK
– BT= 0.5= 500 KHz x 1 s– indice di modulazione (2 f Tb= 0.28-0.35)f = 140/175 KHz
• Pout 3 classi– Classe 1 (100 mW); Classe 2 (2.5 mW); Classe 3 (1 mW),
controllo continuo della potenza• Accesso al canale = FH slow (1 salto ogni 1/3/5 Time Slot)• TS = 625 s
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….. Physical layer
• Clock fissato dal Master
• Clock data Recovery con errore massimo 20ppm, sfrutta 5 bit di preambolo del TS
• Sincronizzazion continua dopo ciascun pacchetto
• BER max 0.1% : richiede una sensitività di almeno -70 dBm
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Wireless Local Area Network WLAN
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HiperLAN2 - Seamless wireless datacom solution
Roaming
Airport
Hotel & Conference
Public space
Office
Home
Train station
Wide area cellular datacom
Local Area WLAN Datacom
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Making the Data Network Go Mobile
Cellular Systems
GSM, TDMA, CDMAGPRS, EDGEW-CDMA, 3G
Wireless LAN
IEEE.802.11, HiperLAN/2
Personal Area Local Area Wide Area
PAN
Bluetooth
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Ricetrasmettitori mobili: Tecnologia e Architettura
Sommario
• Architetture
• Componentistica passiva
• Tecnologie per RFIC
• Esempi di “chip set” commerciali
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Architetture e tecnologie per terminali wireless
(Tecnologie e Chipset Commerciali)
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Sommario
• Chip set commerciali
• Esempio di progetto di un terminale wireless
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Terminale multichip
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Panoramica di chipset commerciali
• Architettura supereterodina
• Architettura Low-IF
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Architettura Supereterodina
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Architettura Low-IF
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Progetto di un front-end per cellulari GSM Dual-Band
• Specifiche
– Cifra di rumore complessiva: NFTOT 10dB
– Guadagno complessivo in ricezione: GMAX 80dB, GMIN 30dB
– Punto di compressione a 1dB: CPI1dB -20dBm
– Intercetta del terzo ordine: IP3I -15dBm
– Reiezione immagine: IR 30dB
– Attenuazione canali adiacenti: 15dB @ f=200kHz
– Potenza di trasmissione: PMAX 30dBm (EGSM), PMAX 28dBm (DCS)
– Livello delle armoniche in uscita: 2f0 , 3f0 -50dBc
– Densità rumore fuori banda: NOISE -100dBc/Hz @ f 400kHz
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Dispositivi utilizzati per il progetto
• Chipset– Tranceiver
UAA3535HL
– Power Amplifier CGY2014TT
– PA ControllerPCF5078
• Altri dispositivi– Antenna
LDA42D
– Diplexer/ Switchplexer LMC36-07A0505A
– Filtro Rx SAF942.5T1842.5ML80T
– VCO MQE921-1840 MQE9PD-897 MQE9PF-1747
– Accoppiatori direzionali LDC15D190A0008
– Isolatori CE073R897DCB CE0521R74DC
– Balun LDB20C500A0900 LDB15C101A1800 LDB15C500A1900
– TCXO TC2268FN13000
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Schema a blocchi del progetto