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On Physical Layer Security for Reactive DF Cognitive Relay Networks
Blekinge Institute of Technology, Faculty of Computing, Department of Communication Systems.
Blekinge Institute of Technology, Faculty of Computing, Department of Communication Systems.
2014 (English)Conference paper, Published paper (Refereed)
Abstract [en]

This paper analyzes the physical layer security for cognitive relay networks under the peak interference power constraint of the primary user receiver. In particular, a secondary user (SU) transmitter communicates with an SU receiver through the help of multiple secondary relays (SRs) using a decode-and- forward (DF) protocol. There exist multiple eavesdroppers (EAVs) who illegally listen to the secondary network communication. We consider a reactive DF scheme, and only the SRs that satisfy a decoding threshold participate in the relay selection. Analytical expressions of the probability of existence of secrecy capacity and secrecy outage probability are obtained. Numerical results are provided to evaluate the impact of the number of SRs, number of EAVs and channel mean powers on the secondary system security. We also investigate the effect of the interference from the primary network to the secondary network performance. Moreover, the performance of proactive DF is analyzed for the purpose of comparison.

Place, publisher, year, edition, pages
Austin, USA: IEEE , 2014.
Keyword [en]
Physical Layer Security, Reactive Decode-and-forwardm, Cognitive Relay Networks
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:bth-6561Local ID: oai:bth.se:forskinfoD600175EFB472F3DC1257D91003908B3OAI: oai:DiVA.org:bth-6561DiVA: diva2:834079
Conference
IEEE Global Communications Conference
Available from: 2014-11-17 Created: 2014-11-15 Last updated: 2017-05-22Bibliographically approved
In thesis
1. Performance Analysis of Cognitive Radio Networks under Spectrum Sharing and Security Constraints
Open this publication in new window or tab >>Performance Analysis of Cognitive Radio Networks under Spectrum Sharing and Security Constraints
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The cognitive radio network (CRN) concept has been proposed as a solution to the growing demand and underutilization of the radio spectrum. To improve the radio spectrum utilization, CRN technology allows the coexistence of licensed and unlicensed systems over the same spectrum. In an underlay spectrum sharing system, secondary users (SUs) transmit simultaneously with the primary users (PUs) in the same frequency band given that the interference caused by the SU to the PU remains below a tolerable interference limit. Besides the transmission power limitation, a secondary network is subject to distinct channel impairments such as fading and interference from the primary transmissions. Also, CRNs face new security threats and challenges due to their unique cognitive characteristics.This thesis analyzes the performance of underlay CRNs and underlay cognitive relay networks under spectrum sharing constraints and security constraints. Distinct SU transmit power policies are obtained considering various interference constraints such as PU outage constraint or PU peak interference power constraint.

The thesis is divided into an introduction and two research parts based on peer-reviewed publications. The introduction provides an overview of radio spectrum management, basic concepts of CRNs, and physical layer security. In the first research part, we study the performance of underlay CRNs with emphasis on a multiuser environment.In Part I-A, we consider a secondary network with delay-tolerant applications and analyze the ergodic capacity. Part I-B analyzes the secondary outage capacity which characterises the maximum data rate that can be achieved over a channel for a given outage probability. In Part I-C, we consider a secondary network with delay constrained applications, and derive expressions of the outage probability and delay-limited throughput. Part I-D presents a queueing model that provides an analytical tool to evaluate the secondary packet-level performance with multiple classes of traffic considering general interarrival and service time distributions. Analytical expressions of the SU average packet transmission time, waiting time in the queue, andtime spent in the system are provided.In the second research part, we analyze the physical layer security for underlay CRNs and underlay cognitive relay networks. Analytical expressions of the probability of non-zero secrecy capacity and secrecy outage probability are derived.Part II-A considers a single hop underlay CRN in the presence of multiple eavesdroppers (EAVs) and multiple SU-Rxs. In Part II-B, an underlay cognitive relay network in the presence of multiple secondary relays and multiple EAVs is studied.Numerical examples illustrate that it is possible to exploit the physical layer characteristics to achieve both security and quality of service in CRNs while satisfying spectrum sharing constraints.

Place, publisher, year, edition, pages
Karlskrona: Blekinge Tekniska Högskola, 2016
Series
Blekinge Institute of Technology Doctoral Dissertation Series, ISSN 1653-2090 ; 3
Keyword
Underlay cognitive radio networks, spectrum sharing constraints, physical layer security
National Category
Communication Systems
Identifiers
urn:nbn:se:bth-11739 (URN)978-91-7295-324-6 (ISBN)
Public defence
2016-05-12, J1650, Campus Gräsvik, Karlskrona, 10:15 (English)
Opponent
Supervisors
Available from: 2016-03-17 Created: 2016-03-16 Last updated: 2016-08-09Bibliographically approved

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Sibomana, LouisZepernick, Hans-Jürgen

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