WCDMA

WCDMA IN MOBILE COMMUNICATION

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WCDMA
Subject-Overview of Mobile Communication
BIT Mesra , Ranchi

Name- GAURAV BISWAS

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Contents

Introduction

UMTS Architecture

WCDMA Architecture

Parameters of WCDMA

Standarization of WCDMA / UMTS

Conclusion

Refrences

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Introduction
Wide band code Division Multiple Access is an improvement
over the existing CDMA standard and it uses a 5MHz wide
radio signal with chip rated of 3.84MHz, the WCDMA
technology support higher bit rate which help to improve
thethe quality of service
to support multiple service each user should
have seperate channels for each service

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UMTS Architecture
UMTS has three Basic components-

UE(user equipment)
-USIM
-ME

UTRAN
-NodeB
-RNC

CN(Core Network)

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UMTS Architecture

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WCDMA Architecture

The UMTS terrstrial ratio access uses FDD as
well TDD for Duplexing

UTRA-FDD is called WCDMA

WCDMA uses DS-SS technique

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WCDMA Architecture

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Parameter of WCDMA

Channel bandwidth 5MHz

Duplex Mode FDD and TDD

Spread Spectrum Technique:Direct Spread or
direct sequence spread spectrum

Chip rate 3.84MHz

Frame length:10ms(38400 chip/sec)

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Standardization of WCDMA / UMTS
WCDMA Air Interface, Main Parameters
Multiple Access Method DS-CDMA
Duplexing Method FDD/TDD
Base Station Synchronization Asychronous Operation
Channel Separation 5MHz
Chip Rate 3.84 Mcps
Frame Length 10 ms
Service Multiplexing Multiple Services with different QoS
Requirements Multiplexed on one
Connection
Multirate Concept Variable Spreading Factor and
Multicode
Detection Coherent, using Pilot Symbols or
Common Pilot
Multiuser Detection, Smart
Antennas
Supported by Standard, Optional in
Implementation

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Conclusion
WCDMA has many advantages like much higher
B.W.(3Mhz), high chip rate(3.84Mcps), high data
rate(up to 2Mbps), enhanced security and so on..
Thus it is the growing technology for
mobile generations

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References
[1] Sanjay Kumar “ Wireless Communication”
edition 2015

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Thank you