Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 35 for “"WCDMA"”.
-
Interception and Analysis of WCDMA Signals
Intercepting wireless signal has been of a great interest for law enforcement and military users as it provides precious information about illegal activity or the enemy intention. To intercept the signal, first, the signal existence must be detected. In case of using the spread spectrum, signal …
-
Capacity and Throughput Optimization in Multi-cell 3G WCDMA Networks
… wideband code division multiple access (WCDMA) networks using 2-dimensional Gaussian distributions by determining the means and the standard deviations of the distributions for every cell. This model allows for the calculation of the inter-cell interference and the reverse-link capacity …
-
Characterization of Uplink Transmit Power and Talk Time in WCDMA Networks
… transmit power levels of a mobile phone in the WCDMA network. The work in this thesis makes two major contributions. First is the characterization of uplink transmit power in WCDMA networks based on current network data (collected in AT&T's WCDMA network) and realistic usage scenarios. Second is …
-
Adaptive Asymmetric Slot Allocation for Heterogeneous Traffic in WCDMA/TDD Systems
… Multiple Access/Time Division Duplexing (WCDMA/TDD) systems since they are known to be efficient for bursty traffic. Most existing MAC protocols developed for WCDMA/TDD systems are interested in the performance of a unidirectional link, in particular in the uplink, assuming that the number …
-
Efficiency Improvement of WCDMA Base Station Transmitters using Class-F power amplifiers
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 …
-
Area and Power Conscious Rake Receiver Design for Third Generation WCDMA Systems
… investigated a design of a rake receiver for the WCDMA (Wideband Code Division Multiple Access) system, which is a third generation wireless communication system. Our rake receiver design is targeted for mobile units, in which low-power consumption is highly important. We made judicious judgments …
-
A study on the effects of soft interference cancellation for uplink WCDMA system
WCDMA system is an interference limited system. Interference cancellation (IC) is a technique that has been widely studied and implemented for WCDMA uplink system to achieve performance close to potential capacity. Most studies until now have been focused on hard interference cancellation. Hard IC …
-
Capacity Improvement Using Adaptive Sectorisation in WCDMA Cellular Systems With Non-Uniform and Packet Mode Traffic
… and QoS trade-offs possible in Wideband CDMA (WCDMA) cellular systems. Application of adaptive sectorisation to improve capacity in such systems when confronted with hot spots is also investigated. It is found that in all situations the adaptive sectorisation brings an overall improvement to …
-
On the Capacity Modelling in 3G Mobile Wireless Communications Systems
… communication systems such as the wideband CDMA (WCDMA). However, the rapid increase in the number of connections and demand for high-speed multimedia communication services supported is contradicting with the limited resources allocated by these systems. WCDMA is an interference-limited system, …
-
Simulation of Third Generation CDMA Systems
… a Wideband Code Division Multiple Access (WCDMA) air interface with the fixed network of Global System for Mobile communications (GSM). In this thesis a signal simulator was implemented according to the physical layer specification of the IMT-2000 WCDMA system. The data is transmitted in a …
-
Gallium nitride class-F power amplifier for UMTSWCDMA applications
… highly efficient, they cannot be applied to UMTS/WCDMA since GSM uses the constant envelope feature of GMSK (Gaussian Minimum Shift Keying) modulation which introduces phase variations only. In UMTS, a WCDMA system with QPSK modulation is used where both phase and amplitude variations are …
-
Development of Methodology for Achieving Reliable GPS Performance In 3G Handset Noisy Environments
… and Wideband Code Division Multiple Access (WCDMA), where the transmit (TX) section of the latter can interfere with the performance of the GPS due to TX band noise injected into the GPS band. For the case of WCDMA, the problem is out-of-band interference due to its TX wide band noise, which …
-
Space Time Processing for Third Generation CDMA Systems
… and better spectral efficiency. Wideband CDMA (WCDMA) has been widely accepted as one of the air interfaces for 3G. A Beamformer-Rake receiver can be an effective solution to provide the receivers enhanced capabilities needed to achieve the required performance of a WCDMA system. This …
-
Performance of CDMA power control for HAPS
… area. Wideband code division multiple access (WCDMA) has emerged as the mainstream air interface solution for 3G networks. Also the ITU has specifically authorized the use of some IMT-2000 (3G) frequency bands from HAPS. This project addresses downlink and uplink power control for high altitude …
-
Efficiency Enhancement of Base Station Power Amplifiers Using Doherty Technique
… Most of the modern wireless applications such as WCDMA use non-constant envelope modulation techniques with a high peak to average ratio. Linearity being a critical issue, power amplifiers implemented in such applications are forced to operate at a backed off region from saturation. Therefore, in …
-
Novel receiver architectures for mobile communications
… cellular mobile communications such as WCDMA and cdma2000, the proposed receiver architectures are successfully employed in channel estimation for turbo decoding in Rayleigh fading channels.
-
Radio Link Performance of Third Generation (3G) Technologies For Wireless Networks
… referred to as 2.5G systems). In the CDMA arena, WCDMA (Wideband CDMA) has emerged as the most widely adopted solution, with CDMA 2000, an evolution from IS-95, also being considered. This thesis compiles and analyzes the results of the work by the standardization committees involved in the …
-
Development and Implementation of Wireless Telecommunication Systems a Collection of Relevant Hardware and Software Patents
… of a wideband code division multiple access (WCDMA) wireless mobile system. The actual state of the art is described in detail, according to the relevant literature in the area of WCDMA systems. Programmable hardware is presented, which is covered through a portfolio of patents. The purpose …
-
Application of smart antennas to wideband code division multiple access : the uplink performance
… of a Wideband Code Division Multiple Access (WCDMA) system in the Frequency Division Duplex (FDD) mode is addressed in this thesis. The beam-forming is implemented with a LS - DRMTA algorithm and a Lagrange multiplier based algorithm using the Q channel only. The results show that the adaptive …
Page 1 of 2