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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

Performance evaluation, optimal power allocation, and physical layer designs for wireless relaying systems

Farhadi, Golnaz. January 2009 (has links)
Thesis (Ph.D.)--University of Alberta, 2009. / Title from PDF file main screen (viewed on Sept. 8, 2009). "A thesis submitted to the Faculty of Graduate Studies and Research in partial fulfillment of the requirements for the degree of Doctor of Philosophy, Department of Electrical and Computer Engineering, University of Alberta." Includes bibliographical references.

Analysis and design of wireless systems with interface and provider diversity competition and cooperation /

Zemlianov, Alexander. De Veciana, Gustavo A., January 2005 (has links) (PDF)
Thesis (Ph. D.)--University of Texas at Austin, 2005. / Supervisor: Gustavo de Veciana. Vita. Includes bibliographical references.

Improving performance of differential space-time block codes

Tarasak, Poramate. 10 April 2008 (has links)
No description available.

Capacity and error probability analysis for space time block codes and pulse position amplitude modulation ultra wideband communication systems

Zhang, Hao 10 April 2008 (has links)
No description available.

Concatenated space-time block codes and turbo codes with unstructured interference

Chow, William. 10 April 2008 (has links)
The performance of space-time block codes in providing transmit diversity is severely degraded when strong localized interference is present. This problem is addressed by investigating a recently proposed coherent space-time block code decoding algorithm for unknown interference suppression. The algorithm assumes a Gaussian noise and interference approximation and is based on a cyclic-based maximum-likelihood estimation technique (CML). In this thesis, simulations are done applying CML in a coherent system with unstructured interference to validate previous work. An extension of these results is obtained by examining factors that affect CML performance and modifying CML for use in a noncoherent system. To improve bit error rate performance, a turbo code for channel coding was added to both systems. This addition required the development of reliability metrics for soft-information transfer between the space-time block code detector and the turbo code decoder. Significant coding gains exceeding 8dB at a bit error rate of are achieved for the turbo-coded system when compared to that of an uncoded system.

On diversity in wireless communications

Li, Wei, Ph. D. 10 April 2008 (has links)
No description available.

Performance of space-time trellis codes in fading channels

Farooq, Mohammad Omar. 10 April 2008 (has links)
No description available.

Quality of service for ad hoc on-demand distance vector routing

Zhang, Yihai. 10 April 2008 (has links)
A mobile ad hoc network (MANET) is a collection of mobile nodes that form a wireless network without the use of a fixed infrastructure or centralized administration, and every node acts as a host as well as a router. The topology of an ad hoc network changes frequently and unpredictably. The mobile nature and dynamic topology of MANETs make it very difficult to provide Quality-of-Service (QoS) assurance in such networks. Considering the limited bandwidth and battery power, finding routes that satisfy the bandwidth constraint of applications is a significant challenge. Ad hoc on-demand distance vector routing (AODV) is an on-demand routing protocol that only provides best-effort routes. QS-AODV is proposed in this thesis. It is based on AODV and creates routes according to the QoS requirements of the applications. It is shown that QS-AODV provides performance comparable to AODV under light traffic. In heavy traffic, QS-AODV provides higher packet delivery ratios and lower routing overheads, at a cost of slightly longer end-to-end delays as the routes in QS-AODV are not always the shortest. The effects of network size and mobility on the performance of QSAODV are shown.

Peak-to-average power-ratio and intercarrier-interference reduction algorithms for orthogonal frequency-division multiplexing systems

Kou, Yajun. 10 April 2008 (has links)
No description available.

An energy-efficient MAC protocol for ad hoc networks

Shi, Yongsheng (Sam Yongsheng). 10 April 2008 (has links)
No description available.

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