Week1 introduction to wireless communication
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description
this slide will describe a short history of electromagnetic wave. How we use it. And common type of wireless communication around us. Then, why security is so important to use when we use wireless to communicate
Transcript of Week1 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
