WIRELESS NETWORK SECURITYWeek1 – Introduction to Wireless Communication

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WIRE VS. WIRELESS

MobilityFix station

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HISTORY

James Clerk Maxwell - 1864

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IMPLEMENTATION

Information Carrier

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ELECTROMAGNETIC WAVE

Frequency Wavelength

c = fl

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FREQUENCY VS. WAVELENGTH

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RADIO FREQUENCY (RF)

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POWER OF RADIO WAVE

WATT Rate of energy conversion or transfer sometime uses miliWatt (mW) 1 watt = 1 (volt) * 1 (amp)

Decibel Unit of measure Logarithmic unit Describe ration of two measurements

𝑑𝐵𝑊=10 log 𝑃𝑃 0

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dBm referenced to 1 miliWatt 1000 miliWatt = 1 Watt 0 dBm = -30 dB

dBm = 0

0.001 Watt

dBW = -30

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ANTENNA

Critical Part of Wireless Communication Transmit / Receive Radio Wave Can increase / decrease Radio Power

dBi – decibel isotropic same level of power all direction

dBi measures Antenna gain

Antenna Gain compared with isotropic antenna

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COMMON ANTENNA TYPE

Yagi

Increase Gain

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COMMON ANTENNA TYPE

Dipole

- Moveable- Balance Signal

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COMMON ANTENNA TYPE

Horn

- significant level of gain

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COMMON ANTENNA TYPE

Parabolic

- High Gain- Directional

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WIRELESS NETWORK

WAN MAN LAN PAN

-Satellite-Microwave

-TV/Radio Broadcast-Cellular GSM 2G/3G-WiMAX

-Wireless LAN-Walkie Talkie

-Bluetooth-Infrared

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SATELLITE

- Coverage in large area included remote area- more delay - loss- cost

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MICROWAVE

- 30 – 50 Km needs line of sight

- more reliability- point to point

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TV CELLULAR 2G 3G WI-MAX

- mobility- serve in urban area

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WIRELESS LAN

- 2.4 GHz / 5 GHz unlicensed band- data transmitting- IEEE 802.11- compatibility

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BLUETOOTH AND INFRARED

- Less than 10 metres- Personal use

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TREND IN THROUGHPUT IN MOBILE COMMUNICATION

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SECURITY IN WIRELESS COMMUNICATION

The process to protect and give us confidentiality that we can access network when we want to and our data will not leak to other people.

Since transmitting, everyone in coverage area can here you.

Signal is propagated everywhere in its range

limitation in bandwidth and resources

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CONCLUDES

Wireless communication use Electromagnetic

transmitter / receiver / carrier

frequency

antenna

wireless communication

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Q & A