Transcript Advanced Communication Systems

Wireless Communications and
Advanced Networks
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Wireless Techniques
Cellular systems
High-speed networks
Advanced digital networks
Ya Bao
Sandra Dudley-Mcevoy
Assessment:
3-hour written examination – 80%
Lab report – 20%
http://www.lsbu.ac.uk/bb
http://eent3.lsbu.ac.uk/staff/baoyb/acs/
by Ya Bao
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Wireless Communications
1). Wireless Communication Technology
2). Cellular System Design Fundamental *
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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 1899. 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
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•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)
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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.
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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
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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
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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).
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