As resource-constrained autonomous vehicles are used for more and more applications, their ability to achieve the lowest possible localization error without expending more power than needed is crucial. Despite this, the parameter settings of the localization systems, both for the platform and the application, are often set arbitrarily. In this thes...
The expectations in performing high-performance cyber-physical applications in resource-constrained devices are continuously increasing. The available hardware is still a main limitation in this context, both in terms of computation capability and energy limits. On the other hand, one must ensure the robust and accurate execution of the application...
An increasing number of complex applications are being executed on resource constrained devices, such as drones and rovers. Such systems often operate in dynamic and unknown environments, and consequently have dynamic performance requirements based on their surroundings. These systems must consider the trade-off between application and platform per...
In optical transport networks, the Quality of Transmission (QoT) using a physical layer model (PLM) is estimated before establishing new or reconfiguring established optical connections. Traditionally, high margins are added to account for the model’s inaccuracy and the uncertainty in the current and evolving physical layer conditions, targeting un...
Published in Multimedia Systems
HTTP adaptive streaming (HAS) is a widely used video streaming technology that suffers from a degradation of user’s Quality of Experience (QoE) and network’s Quality of Service (QoS) when many HAS players are sharing the same bottleneck link and competing for bandwidth. The two major factors of this degradation are: the large OFF period of HAS, whi...
Published in EURASIP Journal on Wireless Communications and Networking
In this paper, we investigate the cross-layer optimization problem of congestion and power control in cognitive radio ad hoc networks (CRANETs) under predictable contact constraint. To measure the uncertainty of contact between any pair of secondary users (SUs), we construct the predictable contact model by attaining the probability distribution of...
Published in Multimedia Tools and Applications
This paper develops a cross-layer optimization solution for video streaming from multiple sources to a central proxy station over a wireless network. The proposed solution manages the application rates and transmission opportunities of various video sources based on the dynamic network conditions in such a way that minimizes the overall video disto...
In modern deep scaled CMOS ICs, the process, voltage and temperature (PVT) variations result to a randomized variation of the transistor’s parameters. The variability is becoming so large that, by adapting conventional corner based design methodology, the design margin introduced by variation might over-kill the benefit of scaling. This PhD project...
Published in Wireless Networks
Wireless sensor networks have been widely suggested to be used in cyber-physical systems for structural health monitoring. However, for nowadays high-rise structures (e.g., the Guangzhou New TV Tower, peaking at 600 m above ground), the extensive vertical dimension creates enormous challenges toward sensor data collection, beyond those addressed in...
Time metrics are extremely important to evaluate the transmission performance on Wireless Mesh Networks (WMNs), whose main characteristic is to use multihop technology to extend the network coverage area. One of such metrics is WCETT (Weighted Cumulative Expected Transmission Time), in which transmission times per hop are weighted for both proactiv...
