Engineering Commons^™

On Enhancements Of Physical Layer Secret Key Generation And Its Application In Wireless Communication Systems, Kang Liu

Electronic Thesis and Dissertation Repository

As an alternative and appealing approach to providing information security in wireless communication systems, secret key generation at physical layer has demonstrated its potential in terms of efficiency and reliability over traditional cryptographic methods. Without the necessity of a management centre for key distribution or reliance on computational complexity, physical layer key generation protocols enable two wireless entities to extract identical and dynamic keys from the randomness of the wireless channels associated with them.

In this thesis, the reliability of secret key generation at the physical layer is examined in practical wireless channels with imperfect channel state information (CSI). Theoretical …

Reducing Multiple Access Interference In Broadband Multi-User Wireless Networks, Ali Nayef Alqatawneh

Graduate Theses and Dissertations

This dissertation is devoted to developing multiple access interference (MAI) reduction techniques for multi-carrier multi-user wireless communication networks.

In multi-carrier code division multiple access (MC-CDMA) systems, a full multipath diversity can be achieved by transmitting one symbol over multiple orthogonal subcarriers by means of spreading codes. However, in frequency selective fading channels, orthogonality among users can be destroyed leading to MAI. MAI represents the main obstacle to support large number of users in multi-user wireless systems. Consequently, MAI reduction becomes a main challenge when designing multi-carrier multi-user wireless networks. In this dissertation, first, we study MC-CDMA systems with different existing …

Wireless Led Motorcycle Jacket, Sean O'Brien

Electrical Engineering

In 2013 there were over 120,000 motorcycle fatalities in the U.S. alone, 73% of which were in the evening or during poor lighting conditions. Motorcyclists are at a disadvantage when it comes to their visibility on the road due to their size and location of lighting indicators. Because of this, motorcyclists are 82% more likely to be in an accident than other automobiles. One of the most common phrases among drivers involved in car vs motorcycle collisions is “I just didn’t see him."

Many products exist on the market to assist with visibility of motorcyclists including high-visibility clothing and gear …

Design And Implementation Of A Passive Neurostimulator With Wireless Resonance-Coupled Power Delivery And Demonstration On Frog Sciatic Nerve And Gastrocnemius Muscle, Jose Aquiles Parodi Amaya

LSU Master's Theses

The thesis presented has four goals: to perform a comprehensive literature review on current neurostimulator technology; to outline the current issues with the state-of-the-art; to provide a neurostimulator design that solves these issues, and to characterize the design and demonstrate its neurostimulation features. The literature review describes the physiology of a neuron, and then proceeds to outline neural interfaces and neurostimulators. The neurostimulator design process is then outlined and current requirements in the field are described. The novel neurostimulator circuit that implements a solution that has wireless capability, passive control, and small size is outlined and characterized. The circuit is …