Wimax 4g Communications

8/3/2019 Wimax 4g Communications

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WiMAX IN 4G COMMUNICATIONS

Madanapalle Institute of Technology and Science


PAPER PRESENTED BY

Authors

Shaik .Fyzullah Ahmed

Electronics and Communications Engineering,

H.T No;08121A04B6,

Sree Vidyanikethan Engineering College,A.Rangampet,

Tirupati,

Phone no.9491520724,

EmailID:[email protected].

Mohammed .C .Aejaaz AhmedElectronics and Communications Engineering,

H.T No:08121A0481,

Sree Vidyanikethan Engineering College,A.Rangampet,

Tirupati,

Phone No.9642392987,

EmailID:[email protected]

CONTENTS:

1. Abstract

2. Introduction

3. Wimax features

4. Types of WiMAX:

Point-to-point (PTP)

Point-to-Multipoint (PMP)

5. Applications of WiMAX





Fixed WiMAX Mobile WiMAX

6. Wimax standards

7. Real time examples using wimax

wimax radio mobile broadband

8. Limitations

9. Amendments in progress

10. Future developments

11. Conclusion

ABSTRACT:

Factors such as innovation, technological obsession, market evolution

and customer needs characterize the growth of any new technology .There is a

growing demand for a technology that addresses most of the customers demands suchas high bandwidth, long and non-line of sight coverage that are not achieved by the

existing technology. This trend is more predominant in the highly mutative wireless

market .4G will fundamentally advance the way we use mobile and existing networks

and repair the problems of 3G .With the supplementary features such as long and non-

line of sight coverage, high-bandwidth and inbuilt quality of service (QOS). The

approaching 4G mobile communication systems are projected to solve still-remaining

problems of 3G systems and to provide a wide variety of new services, from high-quality voice to high-definition video to high-data-rate wireless channels.WiMAX is

an advanced technology solution, based on an open standard, designed to meet this

need, and to do so in a low-cost, flexible way.

WiMAX (World wide interoperability for Microwave Access) allows

interoperability and combines the benefits that other wireless networking technologies

offer individually and leads a path towards 4G and become the 4G wireless

technology in the future. WiMax addresses almost all of the demands. WiMAX

provides high-throughput broadband connections over long distances.







mobile market segments and developing countries where this technology may help

provide affordable broadband services.

WiMAX Features:

• WiMAX provides wireless metropolitan area network (WMAN) connectivity

at speeds of up to 75 Mb/sec.

• WiMAX systems can be used to transmit signal as far as 30 miles.

• A WiMAX base station would beam high-speed Internet connections to homes

and businesses in a radius of up to 50 km (31 miles).

Due to this it is well suited for a country such as India where telecom

infrastructure is poor and last mile access is expensive.

TYPES OF WiMAX :

Point-to-point (PTP) Point-to-Multipoint (PMP)

POINT TO POINT:

Point to point is used where there are two points of interest: one sender and

one receiver. This is also a scenario for backhaul or the transport from the data source

(data center, co-lo facility, fiber POP, Central Office, etc) to the subscriber or for a

point for distribution using point to multipoint architecture. Backhaul radios comprise

an industry of their own within the wireless industry. As the architecture calls for a

highly focused beam between two points range and throughput of point-to point

radios will be higher than that of point-to-multipoint products.

POINT TO MULTIPOINT :





Point-to-multipoint is

synonymous with distribution.One base station can service

hundreds of dissimilar subscribers

in terms of bandwidth and

services offered.

The point to multipoint (PMP)

system allows a radio system to provide services to multiple users. WiMax systems

can also be setup as mesh networks allowing the WiMax system to forward packets

between base stations and subscribers without having to install communication lines

between base stations.

Here we can see the both types of point-to-point & point-to-multipoint

APPLICATIONS OF WiMAX :

There are mainly two applications of WiMAX. They are

• Fixed WiMAX

• Mobile WiMAX

FIXED WiMAX:

Fixed WiMAX applications are point-to-multipoint enabling broadband

access to homes and businesses.





Fixed WiMAX offers cost effective point to point and point to multi-point

solutions

Fixed WiMAX include a radius of service coverage of 6 miles from a

WiMAX base station for point-to-multipoint, non-line-of-sight service. This service

should deliver approximately 40 megabits per second (Mbps) for fixed access

applications.

That WiMAX cell site should offer enough bandwidth to support

hundreds of businesses with T1 speeds and thousands of residential customers with

the equivalent of DSL services from one base station.

MOBILE WiMAX:

Mobile WiMAX allows any telecommunications to go mobile

Mobile WiMAX is based on OFDMA (Orthogonal Frequency Division







The difference between line of sight and non-line of sight

Earlier wireless technologies (LMDS, MMDS for example) were unsuccessful

in the mass market as they could not deliver services in non-line-of-sight scenarios.

This limited the number of subscribers they could reach and, given the high cost of

base stations and CPE, those business plans failed. WiMAX functions best in line of

sight situations and, unlike those earlier technologies, offers acceptable range and

throughput to subscribers who are not line of sight to the base station..

Buildings between the base station and the subscriber diminish the

range and throughput, but in an urban environment, the signal will still be strong

enough to deliver adequate service. Given WiMAX's ability to deliver services non-

line-of-sight, the WiMAX service provider can reach many customers in high-rise

office buildings achieve a low cost per subscriber because so many subscribers can be

reached from one base station.

REAL TIME EXAMPLE USING WiMAX:

WIMAX RADIO:

The major component of a WiMax system includes subscriber station

(SS), a base station (BS) and interconnection gateways to datacom (e.g. Internet) and

telecom (e.g. PSTN). An antenna and receiver (subscriber station) in the home or

business converts the microwave radio signals into broadband data signals for

distribution in the home. In this example, a WiMax system is being used to provide

telephone and broadband data communication services. When used for telephone

services, the WiMax system converts broadcast signals to an audio format (such as





VoIP) for distribution to IP telephones or analog telephone adapter (ATA) boxes.

When WiMax is used for broadband data, the WiMax system also connects the

Internet through a gateway to the Internet. This example also shows that the WiMax

system can reach distances of up to 50 km when operating at lower frequencies(2-11 GHz).

Mobile Broadband

Broadband anytime-anywhere is the great

promise of WiMAX, which has arrived with Mobile WiMAX products.

IEEE 802.16e-2005 standard takes broadband wireless to a new plane. Suddenly it is

possible to have a DSLlike broadband experience anywhere you happen to be, not just

at home or in a Wi-Fi hot spot environment. With WiMAX we start to get Hot Zones

that are a few kilometres wide and the broadband experience moves outdoors.

Mobile broadband opens up a whole new high-speed data experience, which cannot

be matched by the other mobile technologies available today. Imagine you decide to

walk to the nearby park during your lunch break to enjoy the sunny weather. You

receive a call from one of your customers asking you to confirm some price

reductions immediately so that they can place the order. You start a data session on





your smart WiMAX enabled device, log on to the server at work and download the

relevant spreadsheet. You then proceed to confirm the price reduction and you receive

the order from the customer before you have returned to your desk.

LIMITATIONS:1. A commonly-held misconception is that WiMAX will deliver 70 Mbit/s over 50

kilometers. In reality, WiMAX can do one or the other - operating over maximum

range (50 km) increases bit error rate and thus must use a lower bitrate. Lowering the

range allows a device to operate at higher bitrates.

2. Typically, fixed WiMAX networks have a higher-gain directional antenna installed

near the client (customer) which results in greatly increased range and throughput.

3. Mobile WiMAX networks are usually made of indoor "customer premise

equipment " (CPE) such as desktop modems, laptops with integrated Mobile WiMAX

or other Mobile WiMAX devices. Mobile WiMAX devices typically have an omni-

directional antenna which is of lower-gain compared to directional antennas but are

more portable. In practice, this means that in a line-of-sight environment with a

portable Mobile WiMAX CPE, speeds of 10 Mbit/s at 10 km could be deliveredHowever, in urban environments they may not have line-of-sight and therefore users

may only receive 10 Mbit/s over 2 km. Higher-gain directional antennas can be used

with a Mobile WiMAX network with range and throughput benefits but the obvious

loss of practical mobility.

4. Like most wireless systems, available bandwidth is shared between users in a given

radio sector, so performance could deteriorate in the case of many active users in a

single sector. In practice, many users will have a range of 2-, 4-, 6-, 8-, 10- or 12

Mbit/s services and additional radio cards will be added to the base station to increase

the capacity as required.

Because of this, various granular and distributed network architectures are

being incorporated into WiMAX through independent development and within the

802.16j mobile multi-hop relay (MMR) task group. This includes wireless mesh,

grids, network remote station repeaters which can extend networks and connect to

backhaul.

Amendments in progress







CONCLUSION:WiMax is all set to take over the wireless world. WiMAX represents a

global connectivity opportunity in highly developed mobile market segments and

developing countries where this technology may help provide affordable broadband

services Using WiMax. This development will allow for such things as mobile video

conferencing, live video feeds without the cost of satellite time, and connecting to

practically anything live, on-line, and do it with a device in your hand. Amazing! One

to many and one to one telecasting. All the possibilities of broadband combined with

mobility and freedom from place.

The emerging BWA technology WiMAX allows interoperability and

combines the benefits that other wireless networking technologies offer individually

and leads a path towards 4G and become the 4G wireless technology in the future. e-

mail : [email protected]

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Wimax 4g Communications

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