Presentation on theme: "By Ya Bao Wireless Communications and Advanced Networks Wireless Techniques Cellular systems High-speed networks."— Presentation transcript:
by Ya Bao Wireless Communications and Advanced Networks Wireless Techniques Cellular systems High-speed networks Advanced digital networks Ya Bao Sandra Dudley-Mcevoy Assessment: 3-hour written examination – 80% Lab report – 20%
by Ya Bao Wireless Communications 1). Wireless Communication Technology 2). Cellular System Design Fundamental *
by Ya Bao Introduction to wireless communication systems First demonstration in a room in 1896 by G. Marconi. 12 miles in 1897 and across the English Channel (21 miles) in in 1901 Marconi sends the first signal across an ocean. Early Mobile Telephone System Architecture (after WWII) powerful transmitter Single central antenna and coverage (radius 50km) High power consumption of mobile station
by Ya Bao
5 Wireless Communication Systems Paging Systems Cordless Telephone Systems Cellular Telephone Systems (GSM, 3G) * Satellite Communication Systems Globe Position Systems (GPS) Wireless LAN (WLAN) New wireless technologies (WiMax, Bluetooth, 4G)
by Ya Bao Mobile Radio Systems Around the World Many mobile radio standards have been developed for wireless systems. Some of the most common paging, cordless and cellular standards of the world are as below. Paging: The worlds most common paging system is the Post Office Code Standards Advisory Group (POCSAG). This was developed by British Post Office. It supports binary frequency shift keying (FSK) signaling at 512 bps, 1200 bps and 2400bps. The new paging system FLEX and ERMES provides up to 6400bps transmission by using 4-level modulation.
by Ya Bao Cordless: CT2 and Digital European Cordless Telephone (DECT) are the most popular cordless telephone standards throughout Europe and Asia CT2 systems makes use of microcells, which covers small distance using base stations with antenna mounted. This system uses FSK along with 32 kbps adaptive differential pulse code modulation (ADPCM). DECT system accommodates data and voice system for office and business users
by Ya Bao Cellular: The world first cellular system was implemented by the Nippon Telephone and Telegraph company (NTT) in Japan. The cellular standards for each of the countries is as follows: U.S: Follows USDC (U.S Digital Cellular) Europe: Almost All of the European countries uses GSM (Global System for Mobile) Japan: uses Pacific Digital Cellular (PDC) standards Germany: uses C-450 cellular standards
by Ya Bao Cellular concept developed by Bell Laboratory provides the wireless communications to an entire population. Cellular telephone system has developed from first generation analog to second generation digital communications, and finally to the third-generation IMT-2000, (UMTS and CDMA2000).