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On the Outage Capacity of an Underlay Cognitive Radio Network
Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för kommunikationssystem.
Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för kommunikationssystem.
2015 (Engelska)Ingår i: 2015 9TH INTERNATIONAL CONFERENCE ON SIGNAL PROCESSING AND COMMUNICATION SYSTEMS (ICSPCS), IEEE Press, 2015, s. 1-7-Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

In this paper, we consider a point-to-multipoint underlay cognitive radio network under the joint constraint of the primary user peak interference power and maximum transmit power limit of the secondary user (SU). Analytical expressions for the secondary outage capacity are obtained based on exact as well as approximate expressions of the first and second moments of the channel capacity. Numerical results are provided to assess the effect of the number of SU receivers and a given SU outage probability. We also evaluate the impact of the primary network parameters on the secondary network performance.

Ort, förlag, år, upplaga, sidor
IEEE Press, 2015. s. 1-7-
Nyckelord [en]
MULTIUSER DIVERSITY; SYSTEMS
Nationell ämneskategori
Kommunikationssystem
Identifikatorer
URN: urn:nbn:se:bth-11733DOI: 10.1109/ICSPCS.2015.7391726ISI: 000380405700007OAI: oai:DiVA.org:bth-11733DiVA, id: diva2:912452
Konferens
9th International Conference on Signal Processing and Communication Systems (ICSPCS), Cairns, Australia
Tillgänglig från: 2016-03-16 Skapad: 2016-03-16 Senast uppdaterad: 2018-01-17Bibliografiskt granskad
Ingår i avhandling
1. Performance Analysis of Cognitive Radio Networks under Spectrum Sharing and Security Constraints
Öppna denna publikation i ny flik eller fönster >>Performance Analysis of Cognitive Radio Networks under Spectrum Sharing and Security Constraints
2016 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Karlskrona: Blekinge Tekniska Högskola, 2016
Serie
Blekinge Institute of Technology Doctoral Dissertation Series, ISSN 1653-2090 ; 3
Nyckelord
Underlay cognitive radio networks, spectrum sharing constraints, physical layer security
Nationell ämneskategori
Kommunikationssystem
Identifikatorer
urn:nbn:se:bth-11739 (URN)978-91-7295-324-6 (ISBN)
Disputation
2016-05-12, J1650, Campus Gräsvik, Karlskrona, 10:15 (Engelska)
Opponent
Handledare
Tillgänglig från: 2016-03-17 Skapad: 2016-03-16 Senast uppdaterad: 2016-08-09Bibliografiskt granskad

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