W-CDMA : Wideband Code-Division Multiple Access
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23-10-2009, 04:17 PM



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W-CDMA (Wideband Code-Division Multiple Access), an ITU standard derived from Code Division Multiple Access, is officially known as IMT-2000 direct spread. W-CDMA is a third-generation mobile wireless technology that promises much higher data speeds to mobile and portable wireless devices than commonly offered in today's market. The present seminar and presentation discusses the applicability of WCDMA system with respect to 3G mobile system. The reason for the popularity of spread spectrum technique is addressed and the evolution of WCDMA over CDMA is also pointed out. The protocol architecture of WCDMA, WCDMA network architecture and the compatibilty of existing GSM system with WCDMA system are also discussed in brief. Keywords: Code Division Multiple Access, Wideband Code Division Multiple Access, Protocol architecture, Radio Access Network, Global System Miobile.
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21-07-2011, 10:11 AM

Presented By:-
Siddhartha Panda


.ppt   TECHNICAL SEMINAR1.ppt (Size: 515.5 KB / Downloads: 161)
INTRODUCTION
WCDMA stands for Wide Band Code Division Multiple Access.
W-CDMA is a Third-Generation(3G) mobile wireless technology that promises much higher data speeds to mobile and portable wireless devices than commonly offered in today's market.
It is specified by 3rd Generation Partnership Project (3GPP).
It is the key technology for UMTS.
HISTORY
QUALCOMM , the first company to succeed in developing a practical and cost effective CDMA implementation for consumer cell phones.
The world's first commercial W-CDMA service was launched by NTT DoCoMo in Japan.
DUPLEXING
It means to allow the Subscriber to send simultaneously information to the base station while receiving information from the base station.
It is of two types.
(a) TDD
(b) FDD
In FDD ,
(1) Forward Band :- Traffic from base station to mobile
(2) Reverse Band :- Traffic from mobile to base station
DUPLEXING(cont…)
A device called DUPLEXER is used.
The frequency separation between each forward & reverse channel is constant through out the system.
In TDD , Time is used to provide both a forward & reverse link.
Each duplex channel has forward & reverse time slots.
Duplexer is not required.
It is effective when all the users are stationary.
MULTIPLE ACCESS TECHNIQUES
These are used to allow many mobile users to share a finite amount of radio spectrum simultaneously.
The sharing of spectrum is required to achieve high capacity by simultaneously allocating the available bandwidth (or) available amount of channels to multiple users.
Multiple access techniques are of three types.
FDMA
TDMA
CDMA
MULTIPLE ACCESS TECHNIQUES(cont…)
In FDMA, It assigns individual channels to individual users. Each user is allocated a unique frequency band.
In TDMA, It divides radio spectrum into time slots and in each slot only one user is allowed to either transmit or receive.
In CDMA, It allows numerous signals to occupy a single Transmission channel, optimizing the use of available bandwidth. It employs analog-to-digital conversion & Spread Spectrum Technology. Each user has a unique code word. Unlike TDMA or FDMA CDMA has a soft capacity limit.
N=1 + {(W / R) / (E / N)} - (n/S)
MULTIPLE ACCESS TECHNIQUES(cont…)
SPREAD SPECTRUM TECHNIQUE-
I
A kind of modulation system in which the modulated signal bandwidth is much greater than the message signal bandwidth.
The spectral spreading is performed by a code that is independent of the message signal.
Codes are fully orthogonal.
It is of two types .
DS-SS
FH-SS
SPREAD SPECTRUM TECHNIQUE-II
In DS-SS, it spreads the base band data by directly multiplying the base band data pulses with a pseudo-noise (PN) sequence.
In FH-SS, frequency hopping means periodic change of transmission frequency. A frequency hopping signal may be regarded as a sequence of modulated data with time varying pseudo random carrier frequencies.
The DS-Multiple Access is known as CDMA.
SPREAD SPECTRUM TECHNIQUE-III
The basic unit of a code sequence is one chip. The rate of spreading code is denominated as chip rate Rc (chip/s).
SF = Rc / Rb
B=SF * W
The bandwidth increases with spreading.
Better the spreading , lower the Power , Interference decreases.
SPREAD SPECTRUM TECHNIQUE-IV
FREQUENCY REUSE
WCDMA CODING
WCDMA DECODING
WCDMA FEATURES
Duplexing Method : FDD / TDD
Channel Separation : 5MHz
Frame Length : 10 ms , Each Frame has 15 time slots of 0.666 ms each
High chip rate (3.84 Mcps) and data rate (up to 2 Mbps)
Simultaneous voice & data operation
Frequency Reuse Factor = 1
Enhanced security
Base Station Synchronization : Asynchronous Operation
Multimedia support
Soft Inter system handovers.
Supports advanced technologies like Multi User Detection
WCDMA TECHNOLOGY
Asynchronous network operation
Cell search
Soft handover
Compressed mode
OVSF codes
Data rate indication
Speech codec
High-speed packet data
Broadcast and multicast services
WCDMA APPLICATIONS
For the consumer
Video streaming, TV broadcast
Video calls, video clips – news, music, sports
Enhanced gaming, chat, location services…
For business
High speed teleworking
Sales force automation
Video conferencing
Real time financial information
WCDMA / UMTS PROVIDERS
CONCLUSION

WCDMA has many advantages like much higher B.W (5 MHz),high chip rate(3.84Mcps),high data rate(up to 2 Mbps),enhanced security and so on…
Thus it is the growing technology for future mobile generations.
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08-11-2012, 10:27 AM

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