Introduction to Wireless Technology
RELAX
CORNER
* Joke *
When Alex was young he used to pray
for a bike,
then he realized that God doesn't work that way,
so he stole a bike and prayed for forgiveness.
then he realized that God doesn't work that way,
so he stole a bike and prayed for forgiveness.
* Good Picture *
* Enjoy it *
...How Do I Feel....
Basically, we learnt about the wireless in this lesson, so there was quite interesting to know how the signal being transferred from one place to another place via devices.
Besides that, we also know new knowledge about antennas, horn, satellite, and so on...
In addition, two groups of my friends have presented their slide to us, regarding about the creation of website and uploading the music or video to website... that were fun and useful to us...
"Formal education will make you a living. Self-education will make you a fortune."
The lesson I learnt today....
1. TERRESTRIAL MICROWAVE:
•Require line-of-sight transmission and reception equipment
•The taller the antennas
the longer the sight distance
Towers = on hills/mountains
•2 types of antennas:
1.Parabolic
dish
2.Horn
•Parabolic dish: based on
geometry of parabola
•Works like a funnel
(catching a wide range of waves and directing to a common point call focus)
2. Horn
•Looks like gigantic scoop
•Outgoing transmission are
broadcast up a stem & deflected outward in a series of narrow parallel
beams by the scooped shape of the horn.
3. Satellite
•Satellite
acting as a super tall antenna and repeater
•Single
bounce
•Capability
= any location on earth no matter how remote
•Transmission
from earth to satellite = uplink
•Transmission
from the satellite to earth = downlink
1. Wireless technology
- is generally used for mobile IT equipment.
It encompasses cellular telephones, personal digital assistants (PDA's), and
wireless networking.
2. Wireless networking technologies
- range from global voice and data networks, which allow users to
establish wireless connections across long distances, to infrared light and radio frequency technologies that are
optimized for short-range
wireless connections.
3. Wireless communication involves
•radio frequency communication.
•microwave communication, for example long-range
line-of-sight via highly directional antennas, or short-range communication.
•infrared (IR) short-range communication, for example
from remote controls or via IRDA.
Applications may involve
and other wireless networks.
4. Type of Wireless Network
-Wireless wide area networks
(WWANs)
-Wireless
metropolitan area networks (WMANs)
-Wireless
local area networks (WLANs)
-Wireless
personal area networks (WPANs)
5. Application : Data Networking.
Bluetooth is a proprietary open wireless
technology standard for exchanging data over short distances (using
short-wavelength radio transmissions in the ISM band from 2400–2480 MHz)
from fixed and mobile devices, creating personal area networks (PANs) with high levels of security. Created by telecoms vendor Ericsson in 1994, it was originally conceived as a wireless alternative to RS-232 data cables. It can connect several devices, overcoming problems of synchronization.
(Link: http://www.ee.ucla.edu/~lerong/ee202a/hw2/Introduction%20To%20Blue%20Tooth%20Networking.pdf )
Wi-Fi 6.
is a brand originally licensed by the Wi-Fi Alliance to describe the underlying technology of wireless local area networks (WLAN) based on the IEEE 802.11 specifications.
Broadband
wireless access7.
• is a technology aimed at
providing high-speed wireless access over a wide area from devices such as
personal computers to data networks. According to the 802.16-2004 standard, broadband means 'having
instantaneous bandwidth greater than around 1 MHz and supporting data rates greater than about
1.5 Mbit/s'.
•It is planned to be used
in the next few years and is estimated to have a range of 50km (30 miles).
8. 3G vs 4G
How much faster is 4G compared to 3G and what applications run better on 4G?
3G and 4G are standards for mobile communication.
Standards specify how the airwaves must be used for transmitting
information (voice and data). 3G (or 3rd Generation) was
launched in Japan in 2001. As recently as mid-2010, the networks for
most wireless carriers in the U.S. were 3G. 3G networks were a
significant improvement over 2G networks, offering higher speeds for
data transfer. The improvement that 4G offers over 3G is often less pronounced. Analysts use the analogy of standard vs Hi-Def TV to describe the difference between 3G and 4G.
Comparison chart
| 3G | 4G | |||||||
|---|---|---|---|---|---|---|---|---|
| Data Throughput: | Up to 3.1mbps | Practically speaking, 3 to 5 mbps but potential estimated at a range of 100 to 300 mbps. | ||||||
| Forward error correction (FEC): | 3G uses Turbo codes for error correction. | Concatenated codes are used for error corrections in 4G. | ||||||
| Frequency Band: | 1.8 – 2.5GHz | 2 – 8GHz | ||||||
| Services And Applications: | CDMA 2000, UMTS, EDGE etc | Wimax2 and LTE-Advance | ||||||
| Network Architecture: | Wide Area Cell Based | Integration of wireless LAN and Wide area. | ||||||
| Peak Upload Rate: | 50 Mbit/s | 500 Mbit/s | ||||||
| Peak Download Rate: | 100 Mbit/s | 1 Gbit/s | ||||||
| switching technique: | packet switching | packet switching, message switching |
_____________________________________________________________________________
9. Unbounded and bounded media
Bounded media are those that use cables for transmitting electricity or
light; unbounded media does not require cabling and includes satellite,
microwave and radio transmission. Wireless connections, including
802.11b and 802.11g, are examples of unbounded media. Today, bounded
media continue to be more common than unbounded.
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VIDEO
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