Title of dissertation: BEAMFORMING ALGORITHMS FOR INFORMATION RELAYING IN DENSE WIRELESS NETWORKS Mohamed Abdallah, Doctor of Philosophy, 2006 Dissertation directed by: Assistant Professor Haralabos C. Papadopoulos Department of Electrical and Computer Engineering In this dissertation we develop a class of bandwidth-efficient algorithms for information relaying in large-scale wireless ad-hoc ne...

Uplink users in cellular networks, such as UMTS/ HSPA, located at the edge of the cell generally suffer from poor channel conditions. Deploying intermediate relay nodes is seen as a promising approach towards extending cell coverage. This paper focuses on the role of packet scheduling in cellular networks with relay nodes. In particular, two uplink scheduling schemes deploying the relay functio...

Transmit power minimization is one of the major research challenges in Relay-Assisted Cognitive Radio Networks. In this process, the transmit power of each individual relay is adjusted in such a way that the overall transmit power consumption at the relay network is minimized while satisfying the minimum Quality-of-Service (QoS) requirements of primary and secondary networks. In this paper, a s...

Wireless network coding (WNC) has been proposed for next generation networks. In this contribution, we investigate WNC schemes with embedded strong secrecy by exploiting structured interference in relay networks with two users and a single relay. In a practical scenario where both users employ finite, uniform signal input distributions we compute the corresponding strong secrecy capacity, and m...

1Abstract—In this paper, we investigate optimal coding strategies for a class of linear deterministic relay networks. The network under study is a relay network, with one source, one destination, and two relay nodes. Additionally, there is a disturbing source of signals that causes interference with the information signals received by the relay nodes. Our model captures the effect of the interf...

Relay Selection and Resource Allocation in One-Way and Two-Way Cognitive Relay Networks Ahmad Mustafa Alsharoa In this work, the problem of relay selection and resource power allocation in oneway and two-way cognitive relay networks using half duplex channels with di↵erent relaying protocols is investigated. Optimization problems for both single and multiple relay selection that maximize the su...

One-way wireless relay networks have recently received a lot of attention due to their ability to provide spatial diversity in fadingwireless environment.Moreover, performing single-relay selection is a very attractive method due to its cost effective implementation and superior performance. However, one-way relay networks with the half-duplex signalling suffer from a spectral efficiency loss. ...

In wireless networks, it has always been a challenge to satisfy high traffic throughput demands, due to limited spectrum resources. In past decades, various techniques, including cooperative communications, have been developed to achieve higher communication rates. This thesis addresses the challenges imposed by cooperative wireless networks, in particular focusing on practical code constructio...

Network deployment problem is one of the major issues when base stations and relay stations are jointly deployed. Deploying relay station at suitable position covers throughput enhancement and coverage extension problem in IEEE 802.16j MMR networks. In this paper we have proposed a new adaptive model for throughput enhancement and optimal relay selection in IEEE 802.16j MMR networks and studied...