4g Wireless Computing

8/2/2019 4g Wireless Computing

1/18

WIRELESS SYSTEMSPresented by :-

Shobhit ShuklaEN-64


2/18

INTRODUCTION TO WIRELESS COMMUNICATION

o Our ultimate goal is to communicate with any type of information with anyone, at anytime, from anywhere.This is possible with the aid of WIRELESSTECHNOLOGY


3/18

WIRELESS COMPUTINGWIRELESS

GROWTH

INTERNET

GROWTH

RF & DIGITAL

TECHNOLOGY

MOBILE

SOFTWARE

- web access- e-mail- file transfer- location services- streaming audio

& video


4/18

CURRENT TECHNOLOGY

TDMA :Time Division Multiple Access, is a technique fordividing the time domain up into sub channels for use bymultiple devices.

CDMA :Code Division Multiple Access, allows everydevice in a cell to transmit over the entire bandwidth at alltimes.


5/18

W i r e l e s s m o b i l e c o m m u n i c a t i o n s s y s t e m s a r eu n i q u e l y i d e n t i f i e d b y " g e n e r a t i o nd e s i g n a t i o n s .I n t r o d u c e d i n t h e e a r l y 1 9 8 0 s , f i r s t g e n e r a t i o n( 1 G ) s y s t e m s w e r e m a r k e d b y a n a l o g f r e q u e n c y m o d u l a t i o n a n d u s e d p r i m a r i l y f o r v o i c ec o m m u n i c a t i o n s .S e c o n d g e n e r a t i o n ( 2 G ) w i r e l e s s s y s t e m s , w h i c h a p p e a r e d i n t h e l a t e 1 9 8 0 s , w e r e a l s ou s e d f o r v o i c e t r a n s m i s s i o n a n d r e c e p t i o n .T h e w i r e l e s s s y s t e m i n w i d e s p r e a d u s e t o d a y i s2 . 5 G - a n " i n b e t w e e n " s e r v i c e t h a t s e r v e s a s as t e p p i n g s t o n e t o 3 G . W h e r e b y 2 G i sa s s o c i a t e d w i t h ( G S M ) s e r v i c e , 2 . 5 G i s u s u a l l y i d e n t i f i e d a s b e i n g " f u e l e d " b y G e n e r a l P a c k e tR a d i o S e r v i c e s ( G P R S ) a l o n g w i t h G S M .

History of wireless systems


6/18

ISSUES ON 3G WIRELESS SYSTEM

High input fees for the 3G service licenses.Inefficient to meet needs of future high-

performance .Require wider bandwidth.Lack of coverage because it is still new service.


7/18

3 G s y s t e m s a r e d e s i g n e d f o r v o i c e a n d p a g i n gs e r v i c e s , a s w e l l a s i n t e r a c t i v e m e d i a u s e s u c ha s t e l e c o n f e r e n c i n g , I n t e r n e t a c c e s s , a n d o t h e rs e r v i c e s .T h e p r o b l e m w i t h 3 G w i r e l e s s s y s t e m s i s b a n d w i d t h - t h e s e s y s t e m s p r o v i d e o n l y W A Nc o v e r a g e r a n g i n g f r o m 1 4 4 k b p s ( f o r v e h i c l em o b i l i t y a p p l i c a t i o n s ) t o 2 M b p s ( f o r i n d o o rs t a t i c a p p l i c a t i o n s ) .S t e p t o 4 G , t h e " n e x t d i m e n s i o n " o f w i r e l e s sc o m m u n i c a t i o n . T h e 4 g w i r e l e s s u s e sO r t h o g o n a l F r e q u e n c y D i v i s i o n M u l t i p l e x i n g( O F D M ) a n d g i v e s t h e a b i l i t y f o r w o r l d w i d er o a m i n g t o a c c e s s c e l l a n y w h e r e .

Need for 4G wireless system


8/18

spectrum - 500 MHz to 3 GHz 3G EDGE/WCDMA network for uplink, downlink,

control and signalling

4G WOFDM high speed downlinka wireless cable modem

Complement to EDGE/UMTS

High peak data rates (up to 10 Mb/s)in a 5 MHz channel

4G Wireless: One View


9/18

4G WIRELESS SYSTEMS

F o u r t h g e n e r a t i o n w i r e l e s s s y s t e m i s a p a c k e ts w i t c h e d w i r e l e s s s y s t e m w i t h w i d e a r e ac o v e r a g e a n d h i g h t h r o u g h o u t .I t i s d e s i g n e d t o b e c o s t e f f e c t i v e a n d t op r o v i d e h i g h s p e c t r a l e f f i c i e n c y .T h e 4 g w i r e l e s s u s e s O r t h o g o n a l F r e q u e n c y D i v i s i o n M u l t i p l e x i n g ( O F D M ) , U l t r a Wi d eR a d i o B a n d ( U W B ) , a n d M i l l i m e t e r w i r e l e s s .D a t a r a t e o f 2 0 m b p s i s e m p l o y e d . M o b i l es p e e d w i l l b e u p t o 2 0 0 k m / h r.T h e h i g h p e r f o r m a n c e i s a c h i e v e d b y t h e u s e o f s m a r t a n t e n n a s c o m b i n e d w i t h a d a p t i v em o d u l a t i o n a n d p o w e r c o n t r o l .F r e q u e n c y b a n d i s 2 - 8 G H z . i t g i v e s t h e a b i l i t y f o r w o r l d w i d e r o a m i n g t o a c c e s s c e l la n y w h e r e .


10/18

4G H ARDWARE

Ultra Wide Band Networks :Ultra Wideband technology,or UWB, is an advanced transmission technology thatcan be used in the implementation of a 4G network.

Smart Antennas :: Multiple smart antennas can beemployed to help find, tune, and turn up signalinformation


11/18

OFDM FOR 4G W IRELESS ~ 6 kHz

~ 800tones

~ 5 MHz

Orthogonal frequency-divisionmultiplexing (OFDM ) is a method ofencoding digital data on multiplecarrier frequencies.

OFDM is being increasingly used inhigh -speed information transmissionsystems:

- European HDTV- Digital Audio Broadcast (DAB)

- Digital Subscriber Loop (DSL)- IEEE 802.11 Wireless LAN5 MHz channels~ 6 KHz tones~ 13/26 MHz sample rate1 to 2 msec time-slots in 20 to 40 msec frames

Mobile OFDM parameters: ex.


12/18

OFDM CHARACTERISTICS

High peak-to-average power levelsPreservation of orthogonality in severe multi-pathEnables efficient TX and RX diversity Adaptive antenna arrays without joint equalizationSupport for adaptive modulation by subcarrierFrequency diversity Robust against narrow-band interference

Variable/dynamic bandwidthUsed for highest speed applicationsSupports dynamic packet access


13/18

Support for interactive multimedia, voice, streaming video, Internet,and other broadband servicesIP based mobile system.High speed, high capacity, and low cost per bit.Global access, service portability, and scalable mobile services.

Seamless switching, and a variety of Quality of Service drivenservices.Better scheduling and call admission control technique. Ad hoc and multi hop networks (the strict delay requirements of voice make multi hop network service a difficult problem).

Better spectral efficiency. An infrastructure to handle pre existing 3G systems along with other wireless technologies,

Features


14/18

ADVANTAGES

Cellular providers have the opportunity to offerdata access to a wide variety of devicesProvides mobility

More FlexibleMore ReliableEasier to StandardizeOffers Affordability


15/18

DISADVANTAGES

Obtaining information from everyday people illegallybecomes easier.

Involves the possibility of some interference thoughnot much.Capable of being attacked (jamming frequencies).Invasion of privacy increased.


16/18

COMPARISON BETWEEN 3 G AND 4 G

MajorRequirement 3g 4g

Speed 384 Kbps to 2 Mbps 20 to 100 Mbps

Frequency Band Dependent on country Higher frequency bands(2-8 GHz)

Bandwidth 5-20 MHz 100 MHz (or more)

Switching Design Basis All digital with packetizedvoice

Access Technologies

Circuit and Packet

W-CDMA OFDM and MC-CDMA


17/18

CONCLUSION

4G will be a Convergence Platform providing clearadvantages in terms of Coverage, Bandwidth, PowerConsumption, variety of Services, ranging from Pop-Up

advertisements to Location-Based services and IP Datacasting ones.


18/18

4g Wireless Computing

Documents

Transcript of 4g Wireless Computing