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Cdma Technology Seminar Ppt Way2project In

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1 An Introduction To CDMA Technology
Transcript

7/28/2019 Cdma Technology Seminar Ppt Way2project In

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1

An Introduction

To

CDMA Technology

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n

 Short for Code Division Multiple Access 

Developed by US company -QUALACOMM

uses spread-spectrum techniques 

Digital technology for delivering mobile

telephone services

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Spread Spectrum Transmission Model 

Information Signal

i(t)

Data Rate RiBandwidth Wi

Spreading Sequence

Chip Rate Rc

Bandwith Wc

c(t)

Spreading Sequence

Chip Rate Rc

Bandwidth Wc

c(t)

s(t) r(t) d(t)

 jammer interference

Filter

Bandwidth WRecovered

Informational

Signal

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4

Classification of Spread Spectrum Systems

Spread Spectrum Techniques

Direct SequenceTime Hopper Frequency Hopper Hybrid

Wideband Narrowband

Slow Fast

DS/FH

DS/TH FH/TH

DS/FH/TH

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5

Power Control Mechanism

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IS-95 CDMA 

ed on IS-95 Technology

Supports 95 million subscribers worldwide

Network operate in 800 & 1900 freq. band 

Provides voice & data services having speedupto 64 kbits/sec

SMS services also

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000/IS 2000

CDMA-2000

CDMA-2000 1X CDMA-2000 3X

I Phase II Phase

144kbps packet data rate

Two fold increase in both voice capacity &

standby time

Advanced packet data services

Greatly extended battery life

Channel size of 1.25 MHz

Circuit & packet data rates up to

2Mbps

Incorporates advanced multimedia

capabilities

Supports framework for advanced 3G

voice services & vocoders

Channel sizes- 5MHz,10MHz

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Benefits of CDMA 

Increased Capacity

Improved Quality

Simplified System PlanningEnhanced Privacy

Improved Coverage

Increased Portable Talk Time 

Bandwidth on Demand 

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CDMA-Applications 

CDMA for Cellular 

CDMA-Short Message Service

Over-the-Air Activation CDMA Data and Fax 

Subscriber Access Control 

CDMA for Personal Communications Services 

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Conclusion 

Technology of choice for 3G generation because of it’s 

Greater total capacity

Outstanding voice quality

Fewer dropped calls

RF planning and implementation is simplified by it’s 

Capability of re-using single cell frequency

non-contiguous bandwidth requirement

It’s use in satellite communication is of great importance

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CDMA for Cellular 

CDMA-Short Message Service

Over-the-Air Activation CDMA Data and Fax 

Subscriber Access Control 

CDMA for Personal Communications Services 

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000/IS 2000

CDMA-2000

CDMA-2000 1X CDMA-2000 3X

I Phase II Phase

144kbps packet data rate

Two fold increase in both voice capacity &

standby time

Advanced packet data services

Greatly extended battery life

Channel size of 1.25 MHz

Circuit & packet data rates up to

2Mbps

Incorporates advanced multimedia

capabilities

Supports framework for advanced 3G

voice services & vocoders

Channel sizes- 5MHz,10MHz

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Benefits of CDMA 

Increased Capacity

Improved Quality

Simplified System PlanningEnhanced Privacy

Improved Coverage

Increased Portable Talk Time 

Bandwidth on Demand 

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Benefits of CDMA 

Increased Capacity

Improved Quality

Simplified System PlanningEnhanced Privacy

Improved Coverage

Increased Portable Talk Time 

Bandwidth on Demand 

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Benefits of CDMA 

Increased Capacity

Improved Quality

Simplified System PlanningEnhanced Privacy

Improved Coverage

Increased Portable Talk Time 

Bandwidth on Demand 

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