127 research outputs found
Separating the Effect of Independent Interference Sources with Rayleigh Faded Signal Link: Outage Analysis and Applications
We show that, for independent interfering sources and a signal link with
exponentially distributed received power, the total probability of outage can
be decomposed as a simple expression of the outages from the individual
interfering sources. We give a mathematical proof of this result, and discuss
some immediate implications, showing how it results in important
simplifications to statistical outage analysis. We also discuss its application
to two active topics of study: spectrum sharing, and sum of interference powers
(e.g., lognormal) analysis.Comment: Submitted to IEEE Wireless Communications Letter
Interference Mitigation in Frequency Hopping Ad Hoc Networks
Radio systems today exhibit a degree of flexibility that was unheard of only a few years ago. Software-defined radio architectures have emerged that are able to service large swathes of spectrum, covering up to several GHz in the UHF bands. This dissertation investigates interference mitigation techniques in frequency hopping ad hoc networks that are capable of exploiting the frequency agility of software-defined radio platforms
Interference Characterization in Multiple Access Wireless Networks
Contrarily to the point to point wireless link approach adopted in several wireless networks, where
a dedicated channel is usually supporting an exclusive-use wireless link, in the last years several
wireless communication systems have followed a different approach. In the so called “multiple
access wireless networks”, multiple transmitters share the same communication channel in a
simultaneous way, supporting a shared-use of the wireless link. The deployment of multiple access
networks has also originated the emergence of various communication networks operating in the
same geographical area and spectrum space, which is usually referred to as wireless coexistence.
As a consequence of the presence of multiple networks with different technologies that share the
same spectral bands, robust methods of interference management are needed. At the same time,
the adoption of in-band Full-duplex (IBFDX) communication schemes, in which a given node
transmit and receive simultaneously over the same frequency band, is seen as a disruptive topic in
multiple access networks, capable of doubling the network’s capacity.
Motivated by the importance of the interference in multiple access networks, this thesis addresses
new approaches to characterize the interference in multiple access networks. A special
focus is given to the assumption of mobility for the multiple transmitters. The problem of coexistence
interference caused by multiple networks operating in the same band is also considered.
Moreover, given the importance of the residual self-interference (SI) in practical IBFDX multiple
access networks, we study the distribution of the residual SI power in a wireless IBFDX
communication system. In addition, different applications of the proposed interference models
are presented, including the definition of a new sensing capacity metric for cognitive radio networks,
the performance evaluation of wireless-powered coexisting networks, the computation of
an optimal carrier-sensing range in coexisting CSMA networks, and the estimation of residual
self-interference in IBFDX communication systems
Advanced Trends in Wireless Communications
Physical limitations on wireless communication channels impose huge challenges to reliable communication. Bandwidth limitations, propagation loss, noise and interference make the wireless channel a narrow pipe that does not readily accommodate rapid flow of data. Thus, researches aim to design systems that are suitable to operate in such channels, in order to have high performance quality of service. Also, the mobility of the communication systems requires further investigations to reduce the complexity and the power consumption of the receiver. This book aims to provide highlights of the current research in the field of wireless communications. The subjects discussed are very valuable to communication researchers rather than researchers in the wireless related areas. The book chapters cover a wide range of wireless communication topics
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