week6lecture12

week6lecture12内容摘要：

27 Bluetooth  Idea – Universal radio interface for adhoc wireless connectivity – Interconnecting puter and peripherals, handheld devices, PDAs, cell phones – replacement of IrDA – Embedded in other devices, goal: 5€/device (2020: 50€/USB Bluetooth) – Short range (10 m), low power consumption, licensefree GHz ISM – Voice and data transmission, approx. 1 Mbit/s gross data rate 11 of 27 Bluetooth One of the first modules (Ericsson). 12 of 27 Usage Scenarios Examples Data Access Points Synchronization Headset Conference Table Cordless Computer Business Card Exchange Instant Postcard Computer Speakerphone 13 of 27 History and hitech… 14 of 27 Bluetooth  History – 1994: Ericsson (Mattison/Haartsen), “MClink” project – Renaming of the project: Bluetooth according to Harald “Bl229。 tand” Gormsen [son of Gorm], King of Denmark in the 10th century – 1998: foundation of Bluetooth SIG, – 1999: erection of a rune stone at Ericsson/Lund – 2020: first consumer products for mass market, spec. version released  Special Interest Group – Original founding members: Ericsson, Intel, IBM, Nokia, Toshiba – Added promoters: 3Com, Agere (was: Lucent), Microsoft, Motorola – 2500 members – Common specification and certification of products 15 of 27 …and the real stone Located in Jelling, Denmark, erected by King Harald “Bl229。 tand” in memory of his parents. The stone has three sides – one side showing a picture of Christ. This could be the “original” colors of the stone. Inscription: “auk tani karthi kristna” (and made the Danes Christians) Inscription: Harald king executes these sepulchral monuments after Gorm, his father and Thyra, his mother. The Harald who won the whole of Denmark and Norway and turned the Danes to Christianity. Btw: Bl229。 tand means “of dark plexion” (not having a blue tooth…) 16 of 27 Characteristics  GHz ISM band, 79 RF channels, 1 MHz carrier spacing – Channel 0: 2402 MHz … channel 78: 2480 MHz – GFSK modulation, 1100 mW transmit power  FHSS and TDD – Frequency hopping with 1600 hops/s – Hopping sequence in a pseudo random fashion, determined by a master – Time division duplex for send/receive separation  Voice link –。