Dissertations / Theses on the topic 'Wideband Code Division Multiple Access (WCDMA)'
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RAO, THUMATI VENKATA. "DATA PROCESSING DESIGN OF WIDEBAND CODE DIVISION MULTIPLE ACCESS (WCDMA)." Thesis, Blekinge Tekniska Högskola, Avdelningen för signalbehandling, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-1318.
Full textSaur, Stephan. "Channel estimation for mobile wideband code division multiple access (WCDMA)." Aachen Shaker, 2008. http://d-nb.info/989680819/04.
Full textAhn, Dae-Young. "Interference management and code planning in WCDMA UMTS." Thesis, University of Surrey, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.252354.
Full textSaur, Stephan [Verfasser]. "Channel Estimation for Mobile Wideband Code Division Multiple Access (WCDMA) / Stephan Saur." Aachen : Shaker, 2008. http://d-nb.info/1162793139/34.
Full textFang, Yechang. "Realization of Differentiated Quality of Service for Wideband Code Division Multiple Access Core Network." FIU Digital Commons, 2010. http://digitalcommons.fiu.edu/etd/244.
Full textArgyros, Andreas. "Analysis of Wideband Code Division Multiple Access (WCDMA) system with co-channel interference." Thesis, Monterey, California. Naval Postgraduate School, 2007. http://hdl.handle.net/10945/55195.
Full textThe Wideband Code Division Multiple Access is a third generation air interface, initiated in European Union research projects at the start of the 1990s. The standard emerged by the end of 1999 as part of the 3GPP standardization process. It was designed to support multiple simultaneous services with high quality services through an increased data rate. This research examines the properties and parameters of the WCDMA system to determine the feasibility of intercepting and exploiting this technology with known assets. It explores this possibility by looking at link analysis, adaptive antennas and co-channel interference canceling techniques to determine if the interception of WCDMA signals is possible.
Lieutenant Junior Grade, Hellenic Navy
Cheng, Zhuo. "Hybrid Power Control in Time Division Scheduling Wideband Code Division Multiplex Access." Thesis, KTH, Kommunikationssystem, CoS, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-91097.
Full textMed den höga datahastighet som Enhanced Uplink (EUL) medger kan en konventionell algoritm för effektkontroll baserad på signal to interference ratio (SIR) leda till effekthöjning beroende på självinterferens eller felaktigt SIR mål. Time division (TD) schedulering vid Wideband Code Division Multiple Access (WCDMA) anses vara en nyckelfunktion för att uppnå höga datahastigheter. I övergången mellan aktiv och inaktiv transmissionstidsintervall vid time division multiplexing (TDM) har effektoscillering/effektpeak observerats. Detta gör det nödvändigt att se över algoritmerna för effektkontroll vid olika scenarion av TD schedulering. Målet med effektkontrollen i denna studie är att minimera rise over thermal noise (RoT) för en given datahastighet givet begränsningen att kvaliteten på physical layer control channel är tillräcklig (beaktande att dedicated physical control channel (DPCCH) SIR inte understiger 3dB med en sannolikhet på som mest 5%). Ett annat mål är att minimera den lokala effektoscillationen (effektpeakar) som kan inträffa till exempel vid övergång mellan aktiv och inaktiv transmissionstidsintervall. De undersökta hybrida metoderna för effektkontroll är: (1) icke-parametrisk Generalized rake receiver SIR (GSIR) Inner Loop Power Control (ILPC) vid aktiv transmissionstidsintervall + Received Signal Code Power (RSCP) ILPC vid inaktiv transmissionstidsintervall och (2) RSCP ILPC under aktiv transmissionstidsintervall + GSIR ILPC under inaktiv transmissiontidsintervall. Båda metoderna jämförs med ren GSIR och ren RSCP ILPC. Länk nivå simulering med flera användare anslutna till en enda cell visar att: Problemet med effektpeakar observeras tydligt vid GSIR + GSIR transmit power control (TPC) men generellt sett presterar den bra i alla studerade TD scenarion. GSIR presterar bättre än andra TPC metoder beträffande RoT, speciellt i TU kanal modellen. Detta beror på att metoden är bra på att motverka momentant förändrad fading och med god precision estimerar SIR. Bland alla presenterade TPC metoder är GSIR + GSIR TPC den bästa på att behålla en god kvalitet på DPCCH kanalen. Ingen effekthöjning har observerats vid GSIR + GSIR TPC. RSCP + RSCP eliminerar problemet med effektpeakar och presterar bättre än andra TPC metoder presenterade under 3GPPs Pedestrial A (pedA) 3km/h kanal beträffande RoT. Dock är metoden generellt sett sämre på att behålla kontrollkanalens kvalitet än GSIR + GSIR TPC. GSIR + GSIR ILPC eliminerar problemet med effektpeakar och presterar bättre än GSIR power control i ett scenario med 2 och 4 TDM high data rate (HDR) UE och 2 TDM HDR UE tillsammans med 4 Code Division Multiplex (CDM) LDR UE i pedA 3km/h kanalen beträffande RoT. Dock kan inte kvaliteten på kontrollkanalen behållas i detta fall heller under inaktiv transmissionstidsintervall. Det är inte rekommenderat att använda RSCP + GSIR TPC eftersom den presterar sämst av alla TPC metoder beträffande RoT i de allra flesta fall. Till dess fördel är att den är den näst bästa på att behålla kvaliteten på kontrollkanalen. Effektpeakar har observerats när RSCP + GSIR TPC använts. För att behålla kontrollkanalens kvalitet används alltid en minimum SIR nivå ovanpå alla föreslagna TPC metoder. När det finns flera anslutna TDM HDR UEs i cellen indikerar resultaten att det är en utmaning att behålla kvalitetskraven på kontrollkanalen. På grund av detta kan det bli nödvändigt att begränsa antalet anslutna terminaler i en cell i ett TD scenario.
Huynh, Jack, and Mattias Gylin. "Modelering av Wideband : Code Division Multiple Access." Thesis, Linköping University, Department of Electrical Engineering, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2845.
Full textToday wireless transmission of data is becoming more and more popular and the need for faster transmission rates is increasing. Since the bandwidth is limited it is important to try to use it to the fullest. CDMA is a technology that allows multiple accesses on the same frequency and time thus making it very bandwidth efficient. The CDMA technology was first introduced in the second generation’s cellular systems but has since then been improved and is reused in today’s 3G systems as Wideband CDMA. ISY is interested in getting a behavioural model of a W-CDMA system since they had developed a DSP processor called BBP1 and were thinking about adding W-CDMA support for it. Even though our system is not implemented on the BBP1 it should provide a good base for future implementations. This thesis project will describe the construction of a behavioural model of a W-CDMA system following the standard specified by 3GPP. The system simulates W-CDMA transmission and reception and has an optional channel used to simulate real world interference. The receiver uses a rake combiner to improve the performance of the system.
Baey, Sébastien. "Contribution à la qualité de service d'une pile radio flexible pour la transmission de données multimédia en mode paquet sur interface radio UMTS WCDMA." Paris 11, 2004. http://www.theses.fr/2004PA112111.
Full textThis thesis deals with the integration of multimedia traffic on the uplink of the UMTS radio interface. The problem is tackled in its globality, considering jointly the resource sharing possibilities, a good characterization of the traffic to transmit and the possibilities opened in the UMTS standard. The attention is more particularly focused on MPEG4 video and data of the Internet type. The first part of the thesis provides an approach of radio resource sharing in WCDMA mode. The performances of the physical layer multiplexing mechanism with quality of transmission differentiation and the impact of the rate matching mechanism are evaluated. This analysis serves as a basis for the construction of a cost function for estimating the multiservice cellular capacity and the proposition of a quality of transmission adaptive balancing method. The second part of the thesis presents a new statistical model for MPEG4 video traffic. This model consists in a customization of the DBMAP process and allows evaluating the queueing performances analytically. The last part of the thesis integrates this set of works yielding a cooperative scheduling strategy that efficiently multiplexes the packets generated by real time and non real time multimedia applications while respecting the integrity and delay constraints. An analytical method based on M/G/1 type queueing systems theory is given for computing the delays incurred by MPEG4 video and data packets when this strategy is implemented in a UMTS network
Fang, Sher Jiun. "Complementary metal-oxide-semiconductor frequency conversion techniques for wideband code division multiple access /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/6114.
Full textKuo, Hoi. "A study of crest factor reduction for WCDMA and IS-95 systems." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B38778026.
Full textChen, Yejian [Verfasser]. "Data Transmission in Wideband Code Division Multiple Access (WDMA/FDD) Systems with Multiple Transmit Antennas / Yejian Chen." Aachen : Shaker, 2007. http://d-nb.info/1166510980/34.
Full textMorrison, Andrew. "Direction-of-arrival algorithms for space-time W-CDMA receiver structures." Thesis, University of Newcastle Upon Tyne, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341786.
Full textKuo, Hoi, and 郭海. "A study of crest factor reduction for WCDMA and IS-95 systems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B38778026.
Full textWong, Tat-tung, and 黃達東. "Multicarrier CDMA overlay for ultra-wideband wireless communications." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B29491198.
Full textPoek, Chi-ki, and 卜志琦. "Development of a high performance InGaP/GaAs HBT power amplifier for WCDMA applications." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B30446065.
Full textTennant, Mark P. "Low power adaptive equaliser architectures for wireless LMMSE receivers." Thesis, University of Edinburgh, 2007. http://hdl.handle.net/1842/2565.
Full textJaswal, Kavita. "Handoff issues in a transmit diversity system." Thesis, Texas A&M University, 2003. http://hdl.handle.net/1969.1/1586.
Full textCarey, Daniel Jeffrey. "Statistical modelling and reduction of multiple access interference power in wideband DS-CDMA and MC-CDMA communications systems." Queensland University of Technology, 2006. http://eprints.qut.edu.au/16342/.
Full textLowe, Darryn W. "Real-time FPGA realization of an UWB transceiver physical layer." Access electronically, 2005. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20060726.161825/index.html.
Full textRezenom, Seare Haile. "Cell search in frequency division : duplex WCDMA networks." Thesis, 2006. http://hdl.handle.net/10413/2304.
Full textThesis (M.Sc.Eng.)-University of KwaZulu-Natal, Durban, 2006.
Liao, Chia-Ching, and 廖家慶. "Feedback power control algorithms in wideband code division multiplexing access (WCDMA) systems." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/32936627326904925280.
Full text國立暨南國際大學
通訊工程研究所
96
In the thesis, we analysis the performance of the conventional power control algorithm in wideband code division multiplexing access system in high mobility. The simulation result shows that the power control error of conventional fixed step size algorithm increases when the speed of user increases. So we present a new algorithm to improve the performance of power control error. The present algorithm can reduce the power control error and improve the system performance in simulation result.
Lai-li, KANG, and 康來利. "Wideband Code Division Multiple Access Downlink Baseband Receiver for High Speed Downlink Packet Access." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/60504448823847292828.
Full text國立臺灣大學
電機工程學研究所
91
We are now in an epoch of mobile communication. According to the report of newspaper, the ratio of people owning mobile phones in Taiwan has reached 93%. Among numerous wireless communication technologies, WCDMA (Wideband Code Division Multiple Access) is a more advanced technology. The specification of WCDMA has been set by Third Generation Partner Project (3GPP) organization. The main feature of WCDMA is the Orthogonal Variable Spreading Factor (OVSF) codes that are used to preserve the orthogonality between different physical channels, and furthermore they can reduce the inference of AWGN inference and promote the ability of anti-jamming. High Speed Downlink Packet Access (HSDPA) is a more spectral efficient method that can transport considerable amount of data (image, music, etc.) from base stations to mobile phones according to the latest 3GPP specifications. There will be some illustrations and discussions on its influence on communication quality, theory and function of some receiver modules, and procedure of system design in this thesis. Then we will enter the main subject, and discuss how to design a 64QAM baseband receiver.[1]
Chen, Hsuan-Hung, and 陳宣宏. "Study of Space Time Block Code Decoding Algorithms for Wideband Code Division Multiple Access Systems." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/14073585868223808783.
Full text國立中正大學
通訊工程研究所
90
In mobile radio systems, multipath fading causes system performance degradation. In WCDMA system, a new technique, called Space Time block coding based Transmit antenna Diversity (STTD), is provided to overcome multipath fading and improve system performance and capacity. However, space time block decoding algorithms so far are designed for flat fading channels in the literature. In this paper we propose two new schemes, with zero forcing detector and orthogonal detector, for the multipath fading channels. We show that for dual antennas with STTD encoding, either zero forcing detector or orthogonal detector at the mobile gives better performance then single antenna system by computer simulation.
Iskander, Cyril-Daniel. "Variable bit rate video transmission for code-division multiple-access systems in wideband fading channels." Thesis, 2003. http://hdl.handle.net/2429/14979.
Full textLin, Chih-Hsiu, and 林志修. "A space-time 2-D rake receiver for the wideband code division multiple access system." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/60075936805521532897.
Full text蔡豐任. "Study of channel estimation techniques for the closed loop mode transmit diversity in the wideband code division multiple access system." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/68680177984648454422.
Full text國立中正大學
通訊工程研究所
90
Transmit diversity techniques provide a low cost solution to increase downlink capacity in the third generation systems. It is apparent that some form of transmit diversity is essential in 3G systems. Both open and closed loop transmit diversity concepts have been incorporated to the 3GPP specification. The open loop mode applies the space time code, and the closed loop mode utilizes feedback weight control. Closed loop mode transmit diversity is used especially in low mobility environment. Systems with closed loop mode transmit diversity have inferior performance than those with single antenna due to poor channel estimates in the high mobility environment. In this paper we propose a channel estimation technique of closed loop mode transmit diversity in WCDMA systems. By using Monto Carlo computer simulation, we show that the proposed channel estimation method is superior to other channel estimation methods.
Kora, Saju P. "Implementation of a WCDMA AAA receiver on an FPGA based software radio platform." Thesis, 2001. http://hdl.handle.net/10413/8972.
Full textThesis (M.Sc.Eng.)-University of Natal, Durban, 2001.
Pandey, Arvind Nath. "Effect of negative spatial/temporal correlation on the performance of maximal ratio combining in a WCDMA cellular system." Diss., 2003. http://hdl.handle.net/2263/28079.
Full textDissertation (M Eng (Electronic Engineering))--University of Pretoria, 2005.
Electrical, Electronic and Computer Engineering
unrestricted
Ngwenya, Themba M. A. "An investigation into the improvement in WCDMA system performance using multiuser detection and interference cancellation." Diss., 2004. http://hdl.handle.net/2263/25329.
Full textDissertation (MEng (Electronic))--University of Pretoria, 2006.
Electrical, Electronic and Computer Engineering
unrestricted