Wimax

1. WIMAX
By:Mustahid ali

2. INTRODUCTION :




WiMAX is a coined term or acronym meaning
Worldwide Interoperability For Microwave
Access .
WiMax is a new standard being developed by the
IEEE that focuses on solving the problems of point
to multipoint broadband outdoor wireless networks.
It has several possible applications, including last
mile connectivity for homes and businesses and
backhaul for wireless hot spots.
Wimax will offer fixed, nomadic and mobile wireless
broadband connectivity without direct line-of-sight
access to a base station.

3. Technical Details:





Range - 30-mile (50-km) radius from base station.
Speed - 70 megabits per second
Line-of-sight not needed between user and base
station
Frequency bands - 2 to 11 GHz and 10 to 66 GHz
(licensed and unlicensed bands)
Defines both the MAC and PHY layers and allows
multiple PHY-layer specifications

4. Uses of Wimax:




Providing portable mobile broadband
connectivity across cities and countries
through a variety of devices.
Providing a wireless alternative to cable
and DSL for "last mile" broadband access.
Providing data, telecommunications (VoIP)
and IPTV services.
Providing a source of Internet connectivity
as part of a business continuity plan

5. Transmitter &Receiver:


A WiMAX tower, a single WiMAX tower can provide coverage to a
very large area as big as 3,000 square miles (~8,000 square km).
A WiMAX receiver - The receiver and antenna could be a small box
or PCMCIA card or they could be built into a laptop the way WiFi
access is today.

7. Comparison between WiFi &
WiMax:
WiFi
802.11
WiMax
802.16a
Speed
6 - 54 Mbps
70 Mpbs
Band
Unlicensed
Both
Coverage
50 - 1500 ft
2 - 30 Miles

8. Advantages:





High data rate (50Mbits/sec or higher) Long range
(10 miles or more) Low risk of interference.
Can work without line of sight. Low-cost client radios
Low entry cost for service providers, so lots of
competition and wide coverage likely.
Smooth upgrade path from fixed to mobile access
Low risk of interference .
Advanced IP-based architecture.

9. Applications:





Intel announced that it has begun sending
WiMax chipsets to equipment
manufacturers, which are planning to ship
products to customers.
Data centric devices : notebooks,
PDAs, Ultra Mobile PCs
CE devices: games consoles, MP3
players
Voice and voice/data devices :
cellular phones, smart phones
Vertical applications devices : CCTV
cameras, in-vehicle devices.

10. Inherent Limitations
WiMAX cannot deliver 70 Mbit/s over 50 kilometers. Like all wireless
technologies, WiMAX can operate at higher bitrates or over longer
distances but not both. Operating at the maximum range of 50 km (31
miles) increases bit error rate and thus results in a much lower bitrates.
Conversely, reducing the range (to under 1 km) allows a device to operate
at higher bitrates.
A city-wide deployment of WiMAX in Perth, Australia demonstrated that
customers at the cell-edge with an indoor CPE typically obtain speeds of
around 1–4 Mbit/s, with users closer to the cell tower obtaining speeds of up
to 30 Mbit/s

11. Wimax Evolution (Source: Nokia Forum)

12. Source:

13. Growing popularity of Wimax: