LAKIREDDY BALI REDDYCOLLEGE OF ENGINEERING(AUTONOMOUS)

Technical SeminarBy

Yaswanth G(12761A0412)

ECE Dept.

Wireless Technology

OutlineWhat is Wireless

Characteristics of Wireless Communications

Wireless Technologies

Wireless Broadband Access (WBA)

What is WiMAX

WiMax Speed and Range

Why WiMax ?

Comparisons

WiMAX Vison & Advantages

Conclusion

What is wireless ? Wireless means transmitting signals using

radio waves as the medium instead of wires

Wireless technologies are used for tasks as simple as switching off the television or as complex

Now wireless keyboards, PDAs, Lap’s and cellular phones have become part of our daily life.

Characteristics of Wireless Communications

Mobility:

wireless communications system allows users to access information beyond their desk and conduct business from anywhere without having a wire connectivity

Reachability:

Wireless communications systems enable people to be better connected and reachable without any limitation of any location

Being a wireless system, you do no need to spend too much to maintain a wireless network setup.

Maintainability:

Simplicity:

Wireless communication system are easy and fast to move in comparison of cabled network. Initial setup cost could be a bit high but other advantages overcome that high cost.

 Wireless communications systems provide new smart services like SMS and MMS.

New Services:

Wireless Network Topologies

Point-to-point bridge:

As you know a bridge is used to connect two networks. A point-to-point bridge interconnects two buildings having different networks

Point-to-multipoint bridgeThis topology is used to connect three or

more LANs that may be located on different floors in a building or across buildings.

Mesh or ad hoc network

This network is an independent local area network that is not connected to a wired infrastructure and in which all stations are connected directly to one another

Wireless Technologies:

Wireless technologies can be classified in different ways depending on their range. Each wireless technology is designed to serve a specific usage segment. o WIRELESS WIDE AREA NETWORK (WWAN)

o WIRELESS PERSONAL AREA NETWORK (WPAN)

o WIRELESS LOCAL AREA NETWORK (WLAN)

o WIRELESS METROPOLITAN AREA NETWORK (WMAN)

This network enables you to access the Internet via a wireless wide area network (WWAN) access card and a PDA(personal digital asst.) or laptop. Cellular and mobile networks based on CDMA and GSM are good examples of WWAN.

WIRELESS WIDE AREA NETWORK (WWAN):

WIRELESS PERSONAL AREA NETWORK (WPAN)

These networks are very similar to WWAN except their range is very limited

WIRELESS LOCAL AREA NETWORK (WLAN)

This network enables you to access the Internet in localized hotspots via a wireless local area network (WLAN) access card and a PDA or laptop.

WIRELESS METROPOLITAN AREA NETWORK (WMAN)

This network enables you to access the Internet and multimedia streaming services via a wireless region area network (WRAN).

Issues with Wireless Networks:

There are following three major issues with Wireless Networks

• Quality of Service (QoS)

• Security Risk

• Reachable Range

Wireless Broadband Access (WBA):

Broadband wireless is a technology that promises high-speed connection over the air.

It uses radio waves to transmit and receive data directly to and from the potential users whenever they want it.

• Technologies such as 3G, Wi-Fi, WiMAX and UWB(ultra wide band) work together to meet unique customer needs.

• BWA(Broadband Wireless Access) offers an effective, complementary solution to wireline broadband, which has become globally recognized by a high percentage of the population.

WiMax (Worldwide Interoperability for Microwave Access) is a wireless broadband technology, which supports point to multi-point (PMP) broadband wireless access

Based on Wireless MAN technology.

WiMax is basically term for Standard IEEE 802.16

What is WiMAX ?

Introduction to IEEE 802.16 SeriesSeries Technical Field

802.16 10-66 GHz, fixed broadband wireless access system air standard

802.16a 2-11 GHz fixed broadband wireless access system air standard

802.16c Supplementary provisions about the compatibility of 10-66 GHz fixed broadband wireless access system

802.16d 2-11 GHz fixed wireless access system air standard

802.16e 2-11 GHz fixed and mobile broadband wireless access system air standard

802.16f Fixed broadband wireless access system in air interface

802.16g Fixed and mobile broadband wireless access system air interface

WiMax Speed and Range:

o The IEEE wireless(WIMAX) standard has a range of up to 50 kilometers

o Wimax Can deliver broadband at around 75 megabits per second (75 mbps)

o Wimax can approved in January 2003, to provide operations in the <11GHz spectrum range ie., 2.3GHz, 2.5GHz, 3.5GHz, and 5.8GHz

Why WiMax ?

Development of Wireless Communication

Comparisons

Parameters WIMAX

(IEEE802.16)

Mobile WiMAX(IEEE802.16e)

WLAN(IEEE802.11

)

Bluetooth(802.15.1)

Frequency Band: 2-66GHz

2 - 11GHz 2.4 – 5.8GHz

2.4GHz

Range ~31 miles

~31 miles

~100 meters

~10meters

Maximum Data rate:

~134 Mbps

~15 Mbps

~55 Mbps

~3Mbps

Number of users:

Thousands Thousands

Dozens Dozens

WiMAX Vision: Broadband Everywhere

WiMAX - Major Benefits

o This technology offers a high speed, secure, sophisticate, last mile broadband service, and cheap solution to certain rural access zones.

o In a fixed wireless communication, WiMAX can replace the telephone company's copper wire networks, the cable TV's coaxial cable infrastructure.

Conclusion

WiMAX fills the gap between Wi-Fi and

Cellular, thus providing vehicular mobility,

and high service areas and data rates WiMAX

developments have been rapidly moving

forward