Wireless communication allows the transfer of information over distances without wires. Guglielmo Marconi opened the way for modern wireless communication in 1895 with radio transmission. Wireless communication now includes services like mobile communication, fixed wireless services, satellite communication, and various military and scientific uses. Wireless networks allow computing devices to share information and resources without cables. Common wireless network devices include wireless routers, wireless adapters, and cable modems. Wireless networks are used by individuals, businesses, and emergency services for advantages like mobility and easy installation, though there are also health and security issues. Common wireless technologies include broadcasting, mobile phones, Wi-Fi, Bluetooth, and digital TV which have various applications and advantages for communication.

1. Wireless Communication Stela Tonita Jingyue Yu Diandian wang Hui Tian

2. Introduction & Brief history of wireless communication

3. 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.

4. 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

5. 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

6. Wireless Network

7. 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

8. Wireless network devices Cable 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 receiver Wireless adapter card : external adapters that allow computers, both laptops and desktops, to connect to wireless (also known as WiFi) networks.

9. Use of wireless network Individual and business to send and share data Emergency service such as police department. Advantages : Disadvantages : Faster Healthy issue Lower costing (Magnetic radiation) Large range Backup communication link

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

11. Wireless applications

12. Wirelsss technology Broadcasting Mobile phone Wi-Fi Lap-top Bluetooth Digital TV Wireless telephone

13. Broadcasting It is one of the eariest ues of wirelwss communications Advantages: Functional diversity Efficiency in spreading Has a wide range of audience Disadvatages Time limited Single form

14. Mobile phone Most convenient communication technology A veriaty kinds of mobile phones Differernt functions It still has a lot of scope for improvment

15. Wi-Fi Wireless Fidelity Signal range: 120 feet indoors 300 feet outdoors Wi-Fi is widely used in different places

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