Wireless Communication

Stela TonitaJingyue Yu

Diandian wangHui Tian

Introduction & Brief history ofwireless communication

Wireless Communication

• Wireless communication is transfer of information over a distance without the use of electrical conductors or wires. The distances involved may be short (a few meters as in television remote control) or long (thousands or millions of kilometers for radio communications).

• Wireless communication is able to remotely connect to external communications systems such as satellites, cellular phones, and computers throughout the world.

Guglielmo Marconi

•In 1895, Guglielmo Marconi opened the way for modern wireless communications

•From this beginning, wireless communications has developed into a key element of modern society

•In the early 1900s, voice and then music was transmitted and modern radio was born

Wireless Service• Mobile communications including maritime and aeronautical mobile for

communications.• Fixed Services either point to point or point to multipoint services• Satellite used for broadcasting, telecommunications and

internet, particularly over long distance• Other uses including military, radio astronomy, meteorological

and scientific uses

Wireless Network

What is wireless network?• Wireless network is a network

set up by using radio signal frequency to communicate among computers and other network devices.

• Wireless network allow computing devices to share information and resources via wireless communications

• Sometimes it’s also referred to as WiFi Network or WLAN

• Easy to set up and no cable involved

Wireless network devicesCable modem: is a device that enables you to hook up your PC to a local cable TV line and receive data at about 1.5 Mbps. Wirelss router: is a device that performs the functions of a router but also includes the functions of a wireless access point and a network switch. PCI wireless adapter: allows a computing device to join a wireless LAN. Wireless network adapters contain a built-in radio transmitter and receiverWireless adapter card: external adapters that allow computers, both laptops and desktops, to connect to wireless (also known as WiFi) networks.

Use of wireless network• Individual and business to send and share data• Emergency service such as police department.

Advantages: Disadvantages:Faster Healthy issueLower costing (Magnetic radiation) Large rangeBackup communication link

Wireless connectionsTypes of connections:Wireless LAN (Local Area Network)Wireless PAN (Personal Area Network)Wireless MAN (Metropolitan Area Network)Wireless WAN (Wide Area Network)

Wireless applications

Wirelsss technology

• Broadcasting• Mobile phone• Wi-Fi• Lap-top• Bluetooth• Digital TV• Wireless telephone

Broadcasting• It is one of the eariest ues of wirelwss commu

nications• Advantages:Functional diversityEfficiency in spreadingHas a wide range of audience

• DisadvatagesTime limitedSingle form

Mobile phone

• Most convenient communication technology

• A veriaty kinds of mobile phones

• Differernt functions• It still has a lot of scope

for improvment

Wi-Fi

• Wireless Fidelity

• Signal range: 120 feet indoors300 feet outdoors

• Wi-Fi is widely used in different places

Wireless Technology Outlook

Historical Review•Telegraph: started from 1799 Volta’s invention of battery •Telephone: invented by Alexander in 1870 •Wireless Communication1. Wireless telegraph was invented by Marconin.2. In 1895 he demonstrate the transmission of radio signal at about 2km.3. In 1901, he set up experiment to receive a radio signal in Canada from England 1700 miles away.4. Vacuum Triode amplified by De Forest allows radio broadcasting possible.5. AM broadcasting started in 1920 in Pittsburgh.6. First TV system was built in US by V. Zworykin in 1929.7. In 1936, BBS started broadcasting TV in London.

Elements of a communication system

Current wireless system•CELLULAR PHONES •CORDLESS PHONES 1. DECT for home and small office PBXp 2. PHS data application in Japan and wireless fixline service. •WIRELESS LAN •WIDE AREA WIRELESS DATA •BROADBAND WIRELESS ACCESS •SATELLITE NETWORKS 1. Superb broadcasting media, but not quite suitable for voice and data services 2. Audio and TV broadcasting in NA, Europe and many countries in Asia

Future

YouTube - Cellphones of the Future – UDLAP

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