In wireless ad hoc networks, cross-layer design aims at reducing multiple access interference and thus obtaining a higher spatial reuse. In order to identify the most suitable solution for future wireless systems, we compared the aggregate throughput achieved by two types of cross-layer designs. While the first approach suppresses the interference by power control at the transmitter side, the s...

ZnO nanorods (NRs) were synthesized using an in situ low-temperature hydrothermal method. In order to investigate the effect of different seed layers on quality of ZnO NRs arrays, alcoholic, alkaline and acidic seed solutions were deposited by spin coating on ITO-glass substrate. Experimental results revealed that the vertically ZnO NRs obtained from monoethanolamine-based seed layer is the...

Cross-Layer Design (CLD) is a new paradigm that allows the optimization of communication network architectures across the traditional layer boundaries, but does not imply a change of the present layered architecture. Cross-Layer optimization is used in multi media application this is also used in run this type of applications parallel so that network resources are shared. Cross-layer optimizati...

Our lives are going to evolve dramatically in the coming years due to the recent explosion of mobile communications. Intelligent Transport Systems and vehicular networks are one of the resulting vertical applications that are currently being designed and standardized. They are built on the concept of the ITS station, a common reference model inspired from the OSI standard. A first set of operat...

ii Acknowledgments v List of Tables x List of Figures xi

The community notion can be exploited as a rational concept leading users to cooperate in sharing resources on Wireless Mesh Networks. We propose a novel concept for self-organizing networks, where multiple entities (network elements or users) collaborate to achieve common goals, and in particular, to establish the basic connectivity and service delivery infrastructures. The resulting architect...

Our previous MMCN03 paper reported a cross-layer adaptation framework, GRACE-1, that coordinates the adaptation of CPU frequency/voltage, CPU scheduling, and application quality. GRACE-1 assumes that all application processes (or threads) are independent from each other and adapt individually. This assumption, however, is invalid for multithreaded applications that include dependent and coopera...

Cooperative beamforming (CB) is a signal transmission technique that enables long-range communications in an energy efficient manner. CB relies on cooperation from a set of distributed network nodes, each carrying a single transmit antenna and acting as elements of a virtual antenna array. By appropriately weighting their transmissions, the cooperating nodes form one or more beams to cooperativ...

This paper presents SoftRate, a wireless bit rate adaptation protocol that is responsive to rapidly varying channel conditions. Unlike previous work that uses either frame receptions or signal-to-noise ratio (SNR) estimates to select bit rates, SoftRate uses confidence information calculated by the physical layer and exported to higher layers via the SoftPHY interface to estimate the prevailing...