Efficient Channelization Code Management in WCDMA




Introduction

In order to support variable rates of data multimedia in CDMA system, a set of orthogonal codes with
different lengths must be used, because the rate of information varies and the available bandwidth is
fixed . It is possible to support higher data rates in direct sequence CDMA (DS-CDMA) systems
by assigning multiple fixed-length orthogonal codes to a call . In an alternative CDMA scheme
witch is ....etc

[:=Read Full Message Here=:]

Universal Mobile Telecommunications System (UMTS) is one of the third-generation (3G) mobile telecommunications technologies, which is also being developed into a 4G technology , Standing for Universal Mobile Telecommunications System, UMTS combines three different air interfaces, GSM's Mobile Application Part (MAP) core, and the GSM family of speech codecs and UMTS represents an evolution in terms of services and data speeds from todayâ„¢s second generation mobile networks. As a key member of the global family of third generation (3G) mobi ....etc

[:=Read Full Message Here=:]

WCDMA System



Air Interfaces for 3rd Generation Systems


Since 1985, ITU (International Telecommunications Union) has
been developing IMT-2000, previously termed Future Public Land
Mobile Telephone System (FPLMTS).
In 1992, the World Administrative Radio Conference (WARC) of
the ITU identified the frequencies around 2 GHz for future 3rd
generation mobile systems, both terrestrial and satellite.
Within the ITU, the 3rd generation systems are called
....etc

[:=Read Full Message Here=:]

EDGE Compact and EDGE Classic Packet Data Performance
Abstract
Even though cellular radio services have been extremely successful in providing untethered voice communications, wireless data services have captured only a limited market share so far. One obstacle for wireless data services is their limited peak bit rates. Existing wireless data rates, up to several tens of kb/s, may be over one order of magnitude short o ....etc

[:=Read Full Message Here=:]

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 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 evolu ....etc

[:=Read Full Message Here=:]

Introduction to WCDMA



Properties of the Spread Spectrum

• Transmission bandwidth is much larger than information bandwidth.
• Bandwidth does not depend on the informational signal.
• Processing gain = Transmitted bandwidth/ Information bandwidth.
• Classification:
– Direct sequence: Data is scrambled by user specific pseudo noise code at the
transmitter side.
– Frequency Hopping: The signal is spread by changing the frequency over the
transmitted time of the signal:
• Fast frequency ....etc

[:=Read Full Message Here=:]

Efficiency Improvement of WCDMA Base Station Transmitters using Class-F power amplifiers


Muthuswamy Venkataramani



(ABSTRACT)
Universal Mobile Telecommunications Systems (UMTS) is the preferred third generation (3G) communication standard for mobile communications and will provide worldwide coverage, a convenient software technology and very high data rate. The high data rate, especially, requires the use of bandwidth-efficient modulation schemes such as Quadrature Phase Shift Keying (QPSK). But ....etc

[:=Read Full Message Here=:]

WCDMA System



Air Interfaces for 3rd Generation Systems


Since 1985, ITU (International Telecommunications Union) has
been developing IMT-2000, previously termed Future Public Land
Mobile Telephone System (FPLMTS).
In 1992, the World Administrative Radio Conference (WARC) of
the ITU identified the frequencies around 2 GHz for future 3rd
generation mobile systems, both terrestrial and satellite.
Within the ITU, the 3rd generation systems are called
....etc

[:=Read Full Message Here=:]

Please show me links where i can see open source wcdma stack
Godspower Inibu ....etc

[:=Read Full Message Here=:]

3G MOBILE COMMUNICATION TECHNOLOGY EC03 3G MOBILE COMMUNICATION TECHNOLOGY ---- THE EVOLUTIONARY ROUTE TO WIRLESS COMMUNICATION

PRESENTDED BY:
P.MOHAN KRISHNA
(III/IV) B.TECH
E.C.E
IMRAN AHMED
(III/IV) B.TECH
E.C.E
KONERU LAKSHMAIAH COLLEGE OF
ENGINEERING


ABSTRACT:
3G stands for third generation, and is a wireless industry term for a collection of international standards and technologies aimed at increasing efficiency and improving the performance of ....etc

[:=Read Full Message Here=:]

Presented by:
Rodger E. Ziemer


3G CDMA - WCDMA and cdma2000
Rules for Efficient Multiple Access
Three laws
 Know the channel
 Minimize interference to others
 Mitigate interference received from others
 Requirements of wireless multiple access
 Channel measurement
 Channel control and modification
 Multiple user channel isolation
Why CDMA?
 Higher capacity
 Improved performance in multipath by diversity
 Lower mobile transmit power = longer battery life
 ....etc

[:=Read Full Message Here=:]

The third generation of mobile cellular systems are intended to unify the diverse systems we see today into a seamless radio infrastructure capable of offering a wide range of services in different radio environments, with the quality we
have come to expect from wire line communication networks. Since the mid-80's, studies on 3G systems have been carried out within the International Telecommunication Union (ITU), where it was called Future Public Land Mobile Telecommunication Systems (FPLMTS), lately renamed International Mobile Telecommunicat ....etc

[:=Read Full Message Here=:]

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 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 evolu ....etc

[:=Read Full Message Here=:]

Power control is one of the technologies used to utilize the radio resources as efficient as possible in WCDMA. The transmission power is adjusted to transmit with the lowest power level possible while the required received signal quality is maintained. Since there are large variation in channel quality over time, the power has to be adjusted to compensate for these variations. During moments of bad channel conditions a high transmission power has to be used which will to a greater extent interfere with other users in the system.To solve this ....etc

[:=Read Full Message Here=:]

Abstract
RAKE receiver is used in CDMA-based
(Code Division Multiple Access) systems and can combine Multipath components, which are time-delayed versions of the original signal transmission. Combining is done in order to improve the signal to noise ration at the receiver. RAKE receiver attempts to collect the time-shifted versions of the original signal by providing a separate correlation receiver for each of the multipath signals. This can be done due to multipath components are practically uncorrelated from another ....etc

[:=Read Full Message Here=:]

TECHNICAL PAPER PRESENTATION ON ENHANCED DATA FOR GSM EVOLUTION (EDGE)
A Mobile communication technology
ABSTRACT
Today fast growing world needs fast communication either it may be voice or data. This calls for a new technology which is faster than all existing technologies in mobile communication and hence can replace technologies like GPRS. Enhanced Data for GSM Evolution (EDGE) is such a technology .EDGE is a member of global system for mobile communications (GSM).In short ED ....etc

[:=Read Full Message Here=:]

Presented by:
Rodger E. Ziemer


3G CDMA - WCDMA and cdma2000
Rules for Efficient Multiple Access
Three laws
 Know the channel
 Minimize interference to others
 Mitigate interference received from others
 Requirements of wireless multiple access
 Channel measurement
 Channel control and modification
 Multiple user channel isolation
Why CDMA?
 Higher capacity
 Improved performance in multipath by diversity
 Lower mobile transmit power = longer battery life
 ....etc

[:=Read Full Message Here=:]

In third generation WCDMA systems, shared channels allow many users to jointly utilize a single Orthogonal Variable Spreading Factor (OVSF) code. In this paper, we propose a Scheduling Algorithm with Dynamic Priority Assignment (DPA) which is designed for the Downlink-Shared channel (DSCH) of 3G WCDMA systems and operates within a cross layer framework. The DPA scheduler has low computational complexity and is able to provide QoS differentiation among traffic flows based on their delay sensitivity. Through the cross layer framework, DPA takes i ....etc

[:=Read Full Message Here=:]