A fully CMOS integrated radio frequency (RF) transceiver for wireless sensor networks in sub-GHz ISMband applications is implemented and measured. The IC is fabricated in 0.18-μm CMOS technology and packaged in LPCC package. The fully monolithic transceiver consists of a receiver, a transmitter and a RF synthesizer with on-chip VCO. The chip fully complies with the IEEE 802.15.4 WPAN standard i...

Spatial and temporal load variations, e.g. flash overloads and traffic hot spots that persist for minutes to hours, are intrinsic features of wireless networks, and give rise to potentially huge performance repercussions. Dynamic load balancing strategies provide a natural mechanism for dealing with load fluctuations and alleviating the performance impact. In the present paper we propose a dist...

Space-time coding and spatial multiplexing are prime candidates for achieving high data rates and link quality in multiple-input multiple-output (MIMO) wireless links. However, both the schemes assume no channel knowledge at the transmitter. In a number of applications, channel knowledge can be made available at the transmitter. A natural question to ask is how to use these channel estimates to...

Ambient backscatter communication technology has been introduced recently, and is then quickly becoming a promising choice for self-sustainable communication systems as an external power supply or a dedicated carrier emitter is not required. By leveraging existing RF signal resources, ambient backscatter technology can support sustainable and independent communications and consequently open up ...

In wireless ad hoc networks (WANETs), e.g. wireless sensor networks, battery-powered devices are constrained by limited amount of energy. Many WANET applications require that the duration (called lifetime) for which the network remains operational until the first node exhausts its battery energy is maximized. We study the problem of maximizing the lifetime of WANET broadcast trees under two rec...

This study covers a self-powered wireless communication system that is powered using piezoelectric energy harvester (PEH) in shoe. The lead-zirconate-titanate (PZT) ceramic of the PEH was coated with UV resin, which (after curing under light) allowed it to withstand periodic pressure. designed simple structure and placed sole durability tested pushing tester its applicability shoes examined. Wi...

The demand for wireless data services has been dramatically growing over the last decade. This growth has been accompanied by a significant increase in the number of users sharing the same wireless medium, and as a result, interference management has become a hot topic of research in recent years. In this dissertation, we investigate feedback and transmitter cooperation as two closely related t...

In this paper, we address a preamble pattern identification based synchronization system for UWB-based distributed wireless networks. A correlation based preamble pattern identification method is introduced. A network domain division and nodes tree setting approach according to the principle of Voronoi diagram is proposed and discussed. Therefore, synchronization concluding not only synchroniza...

The introduction of third generation wireless systems provides the opportunity to develop a wide range of new mobile data services. Many of the proposed services (e.g. Voice over IP, streaming audio/video, and other multimedia) include data that require guarantees on throughput, delay, and probability of data loss. However, wireless links are inherently unreliable since the channel is subject t...

The design and simulation of coding schemes, medium access control and link layer protocols for future industrial wireless local area networks can be supported by some understanding of the statistic properties of the bit error patterns delivered by a wireless link (which is an ensemble of transmitter, channel, receiver, modems). We present results of bit error measurements taken with an IEEE 80...