By

Suryanarayana Murthy.A

B-Tech (ECE)

Fourth generation wireless system with wide area coverage and high throughput.

Any where any time multimedia 4G is a successor to 3G and 2G standards It is launched in the year 2010.

AMPS ( Advance mobile phone system ) was first launched by US in 1980’s

the radio signals that 1G networks use are analog

Up to 2.4Kbps 1G technology which allows users to make

voice calls within one country. Access technology used is fdma

2G cellular telecom networks were commercially launched in 1991

Digital –consists of 1s and 0s Digital signal: 1) Low level, 2) High level, 3) Rising edge, and

4) Falling edge

Second Generation (2G): Digital voice systems CDMA, TDMA GSM (Global System for Mobile communication)

Second Generation – advanced (2.5G): Combining voice and data communications Providing enhanced data rate GPRS (General Packet Radio Service)

o email and web browsing

Advantages: The lower powered radio signals require less

battery power The digital voice encoding allows digital error

checking

- increase sound quality

- lowers the noise level Introduction of digital data transfer

- SMS –“short message service”

- E-mail

Disadvantages: Cell towers had a limited coverage area Low data transfer rate

2.05 Mbits/second to stationary devices. 384 Kbits/second for slowly moving devices, such as

a handset carried by a walking user. 128 Kbits/second for fast moving devices, such as

handsets in moving vehicles. A greater number of users that can be simultaneously

supported by a radio frequency bandwidth

Advantages More bandwidth, security, and reliability Fixed and variable data rates. multimedia services. Global roaming Large capacity and broadband capabilities

Disadvantages of 3G 3G phones are expensive High input fees for the 3G service licenses Lack of 2G mobile user buy-in for 3G wireless

service network deployment costs Base stations need to be closer to each

other(more cost)

Time-Line of “Generations

3G 4G

Frequency Band

1.8 - 2.5 GHz 2 - 8 GHz

Bandwidth 5-20 MHz 5-20 MHz

Data rate Up to 2Mbps Up to 20 Mbps or more

Access Wideband CDMA Multi-carrier - CDMA or

OFDM

Switching Circuit/Packet Packet

Mobile top speeds 200 kmph 200 kmph

Objectives 4G is being developed to accommodate

the quality of service Improve applications like wireless

broadband access, Multimedia Messaging Service (MMS), video chat, mobile TV, Digital Video Broadcasting (DVB), minimal services like voice and data

A data rate of at least 100 Mbps between any two points in the world

Principal technologies OFDM MIMO: To attain ultra high spectral efficiency

single channel utilizes multiple sub-carriers on adjacent frequencies.

sub-carriers in an OFDM system are precisely orthogonal to one another, thus they are able to overlap without interfering

It allows transfer of more data than other forms of multiplexing (time, frequency, code, etc)

User data rate 2.56 - 8.96 Mbps

Modulation QPSK,QAM

Coding rate 1/2 - 7/8

Data subcarriers 512 (average) (128, 256,384 optional

Symbol duration 200µs

Guard interval 40µs

Subcarrier spacing 6.25 kHz

Channel Spacing 5 MHz (1.25 MHz optional)

Carrier frequency --2GHz

Smart antennas are used which can increase systems capacitySpatial multiplexing is used

PARAMETERS 4G

Key Requirement Data and voice converged over IP

IP All IP (lPv6)

Frequency Band Higher frequency bands 2 - 8 GHz

Bandwidth 5 - 20 MHz (might even go to 100MHz or higher)

Data Rate Up to 20 Mbps (might even reach 100Mbps or more)

Access Technology Multi-carrier CDMA (MC-CDMA)orOFDM(TDMA)

Switching Design Basis Packet

Mobile Top Speeds 200 km/hr

Deployment 2007-2010

High speed low cost per bit High quality of service Variety of services On connectivity

Battery usage is more Hard to implement Need complicated hardware

1. NTT DoCoMo (JAPAN)2. DIGIWEB (IRELAND)3. SPRINT (CHICAGO)4. VERIZON WIRELESS5. VODAFONE GROUP6. AMERICAN WIRELESS PROVIDER

CLEARWIRE ETC..

T3’s 3D GOGGLE PHONE NOKIA’s WRISTBAND PHONE

SAMSUNG

Battery usage is more

Hard to implement

Need complicated hardware