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Kabiri, Charles
Publications (10 of 16) Show all publications
Kabiri, C., Zepernick, H.-J. & Tran, H. (2016). Outage Probability of a Cognitive Cooperative Relay Network with Multiple Primary Users Under Primary Outage Constraint. In: PROCEEDINGS OF THE 2016 INTERNATIONAL CONFERENCE ON ADVANCED TECHNOLOGIES FOR COMMUNICATIONS (ATC): . Paper presented at International Conference on Advanced Technologies for Communications (ATC), Hanoi, VIETNAM (pp. 38-42). IEEE
Open this publication in new window or tab >>Outage Probability of a Cognitive Cooperative Relay Network with Multiple Primary Users Under Primary Outage Constraint
2016 (English)In: PROCEEDINGS OF THE 2016 INTERNATIONAL CONFERENCE ON ADVANCED TECHNOLOGIES FOR COMMUNICATIONS (ATC), IEEE, 2016, p. 38-42Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, we consider a cognitive cooperative relay network (CCRN) that utilizes a decode-and-forward relay in the presence of multiple primary users. Given this system setting, we study the effect of multiple primary transmitters (PU-Txs) and multiple primary user receivers (PU-Rxs) on the outage probability of the considered CCRN. Specifically, power allocation policies for the secondary user transmitter (SU-Tx) and the secondary relay (SR) are formulated, subject to the outage constraint which is imposed by the PU-Rxs as well as the peak transmit power limits given at the SU-Tx and SR. On the basis of these power allocation policies for the SU-Tx and SR, an expression for the outage probability of the CCRN is derived. Numerical examples are presented to show the effect of different system parameters on the outage probability of the CCRN.

Place, publisher, year, edition, pages
IEEE, 2016
Series
Proceedings International Conference on Advanced Technologies for Communications, ISSN 2162-1020
Keywords
INTERFERENCE; PERFORMANCE; CHANNELS
National Category
Communication Systems
Identifiers
urn:nbn:se:bth-13925 (URN)10.1109/ATC.2016.7764809 (DOI)000392249400008 ()978-1-5090-2711-8 (ISBN)
Conference
International Conference on Advanced Technologies for Communications (ATC), Hanoi, VIETNAM
Available from: 2017-02-22 Created: 2017-02-22 Last updated: 2017-03-16Bibliographically approved
Kabiri, C., Zepernick, H.-J. & Tran, H. (2015). Effective capacity of cognitive cooperative relay networks over α-μ Fading channels. In: 2015 21st Asia-Pacific Conference on Communications, APCC 2015: . Paper presented at 21st Asia-Pacific Conference on Communications, APCC 2015; Kyoto (pp. 427-432). IEEE Press, Article ID Article number 7412551.
Open this publication in new window or tab >>Effective capacity of cognitive cooperative relay networks over α-μ Fading channels
2015 (English)In: 2015 21st Asia-Pacific Conference on Communications, APCC 2015, IEEE Press, 2015, p. 427-432, article id Article number 7412551Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, the effective capacity, a link-layer model supporting Quality of Service (QoS) metrics such as user data rate, packet loss rate and service delay, is analyzed. We consider an underlay cognitive cooperative relay network (CCRN) subject to independent non-identically distributed aH fading. An analytical expression of the effective capacity is derived by means of Fox H-functions and Meijer G-functions along with the Mellin transform of the product of two H-functions. The network performance is analyzed against the QoS exponent and the peak interference power constraint imposed by primary users.

Place, publisher, year, edition, pages
IEEE Press, 2015
Keywords
Fading channels; Relay control systems, Analytical expressions; Cooperative relay networks; Effective capacity; Fox H-functions; Interference power constraints; Meijer g functions; Mellin transform; Packet loss rates, Quality of service
National Category
Communication Systems Telecommunications
Identifiers
urn:nbn:se:bth-13154 (URN)10.1109/APCC.2015.7412551 (DOI)000380572900062 ()2-s2.0-84964577783 (Scopus ID)978-488552301-4 (ISBN)
Conference
21st Asia-Pacific Conference on Communications, APCC 2015; Kyoto
Note

Conference of 21st Asia-Pacific Conference on Communications, APCC 2015 ; Conference Date: 14 October 2015 Through 16 October 2015; Conference Code:119501

Available from: 2016-10-04 Created: 2016-10-03 Last updated: 2016-11-08Bibliographically approved
Kabiri, C. (2015). On the Performance of Underlay Cognitive Radio Networks with Interference Constraints and Relaying. (Doctoral dissertation). Karlskrona: Blekinge Institute of Technology
Open this publication in new window or tab >>On the Performance of Underlay Cognitive Radio Networks with Interference Constraints and Relaying
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Efficiently allocating the scarce and expensive radio resources is a key challenge for advanced radio communication systems. To this end, cognitive radio (CR) has emerged as a promising solution which can offer considerable improvements in spectrum utilization. Furthermore, cooperative communication is a concept proposed to obtain spatial diversity gains through relays without requiring multiple antennas. To benefit from both CR and cooperative communications, a combination of CR networks (CRNs) with cooperative relaying referred to as cognitive cooperative relay networks (CCRNs) has recently been proposed. CCRNs can better utilize the radio spectrum by allowing the secondary users (SUs) to opportunistically access spectrum, share spectrum with primary users (PUs), and provide performance gains offered by cooperative relaying. In this thesis, a performance analysis of underlay CRNs and CCRNs in different fading channels is provided based on analytical expressions, numerical results, and simulations. To allocate power in the CCRNs, power allocation policies are proposed which consider the peak transmit power limit of the SUs and the outage probability constraint of the primary network. Thus, the impact of multiuser diversity, peak transmit power, fading parameters, and modulation schemes on the performance of the CRNs and CCRNs can be analyzed. The thesis is divided into an introduction and five research parts based on peer-reviewed conference papers and journal articles. The introduction provides fundamental background on spectrum sharing systems, fading channels, and performance metrics. In the first part, a basic underlay CRN is analyzed where the outage probability and the ergodic capacity of the network over general fading channels is derived. In the second part, the outage probability and the ergodic capacity of an underlay CRN are assessed capturing the effect of multiuser diversity on the network subject to Nakagami-m fading. Considering the presence of a PU transmitter (PU-Tx), a power allocation policy is derived and utilized for CRN performance analysis under Rayleigh fading. In the third part, the impact of multiple PU-Txs and multiple PU receivers (PU-Rxs) on the outage probability of an underlay CCRN is studied. The outage constraint at the PU-Rx and the peak transmit power constraint of the SUs are taken into account to derive the power allocation policies for the SUs. In the fourth part, analytical expressions for the outage probability and symbol error probability for CCRNs are derived where signal combining schemes at the SU receiver (SU-Rx) are compared. Finally, the fifth part applies a sleep/wake-up strategy and the min(N; T) policy to an underlay CRN. The SUs of the network operate as wireless sensor nodes under Nakagami-m fading. A power consumption function of the CRN is derived. Further, the impact of M/G/1 queue and fading channel parameters on the power consumption is assessed.

Place, publisher, year, edition, pages
Karlskrona: Blekinge Institute of Technology, 2015. p. 210 p.
Series
Blekinge Institute of Technology Doctoral Dissertation Series, ISSN 1653-2090 ; 2
Keywords
Cognitive Radio Networks, Cognitive Cooperative Relay Networks, Underlay Spectrum Access, Interference Constraint, Outage Constraint
National Category
Telecommunications Computer Sciences Signal Processing
Identifiers
urn:nbn:se:bth-00609 (URN)oai:bth.se:forskinfoA0956D5BF0C16D16C1257DFE00587EE2 (Local ID)978-91-7295-298-0 (ISBN)oai:bth.se:forskinfoA0956D5BF0C16D16C1257DFE00587EE2 (Archive number)oai:bth.se:forskinfoA0956D5BF0C16D16C1257DFE00587EE2 (OAI)
Available from: 2015-04-27 Created: 2015-03-04 Last updated: 2018-01-11Bibliographically approved
Kabiri, C., Sibomana, L. & Zepernick, H.-J. (2015). Symbol Error Probability and Effective Capacity of an Underlay CRN over alpha-mu Fading Channels. In: 2015 9TH INTERNATIONAL CONFERENCE ON SIGNAL PROCESSING AND COMMUNICATION SYSTEMS (ICSPCS): . Paper presented at 9th International Conference on Signal Processing and Communication Systems (ICSPCS), DEC 14-16, 2015, Cairns, AUSTRALIA. IEEE Communications Society
Open this publication in new window or tab >>Symbol Error Probability and Effective Capacity of an Underlay CRN over alpha-mu Fading Channels
2015 (English)In: 2015 9TH INTERNATIONAL CONFERENCE ON SIGNAL PROCESSING AND COMMUNICATION SYSTEMS (ICSPCS), IEEE Communications Society, 2015Conference paper, Published paper (Refereed)
Abstract [en]

This paper analyses the performance of an underlay cognitive radio network (CRN) over alpha-mu fading channels in terms of symbol error probability (SEP) and effective capacity (EC). The alpha-mu distribution allows for a more general fading model with an increased level of generality compared to well-known models such as Nakagami-m and Rayleigh fading. The SEP and EC at the secondary user receiver are therefore evaluated for different fading parameters alpha and mu In the considered underlay CRN, the secondary user transmit power is subject to a peak interference power constraint in order to limit the interference to the primary user receiver. Given this setting, analytical expressions for the SEP and EC are derived for the general case of alpha-mu fading channels. Numerical results are provided to illustrate the performance of the considered underlay CRN on different fading channels.

Place, publisher, year, edition, pages
IEEE Communications Society, 2015
Keywords
WIRELESS; ENVIRONMENTS; RAYLEIGH; QUALITY; SERVICE; POWER; MODEL
National Category
Signal Processing Communication Systems
Identifiers
urn:nbn:se:bth-12965 (URN)000380405700008 ()978-1-4673-8118-5 (ISBN)
Conference
9th International Conference on Signal Processing and Communication Systems (ICSPCS), DEC 14-16, 2015, Cairns, AUSTRALIA
Available from: 2016-08-31 Created: 2016-08-30 Last updated: 2017-05-23Bibliographically approved
Kabiri, C., Zepernick, H.-J. & Hung, T. (2014). On Power Consumption of Wireless Sensor Nodes with Min(N,T) Policy in Spectrum Sharing Systems. In: IEEE Vehicular Technology Conference Proceedings: . Paper presented at IEEE 79th Vehicular Technology Conference (VTC-Spring),Seoul, Korea. IEEE
Open this publication in new window or tab >>On Power Consumption of Wireless Sensor Nodes with Min(N,T) Policy in Spectrum Sharing Systems
2014 (English)In: IEEE Vehicular Technology Conference Proceedings, IEEE , 2014Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, we analyze the power consumption of wireless sensor nodes with min(N, T) policy and M/G/1 queue in the presence of Nakagami-m fading. In particular, this system setting is applied to a wireless sensor node operating in a cognitive radio system as secondary user in the presence of a primary user. As such, not only the queue policy influences the power consumption but also the interference power constraint imposed on the wireless sensor node by the primary user. Thus, a queued sleep/wake-up strategy is analyzed in order to mitigate the average power consumption of a sensor node using min(N, T) policy in the context of an M/G/1 queue and a spectrum sharing environment in the presence of signal fading. Numerical examples are presented to illustrate the impact of queuing parameters and fading channel on the power consumption of a wireless sensor node.

Place, publisher, year, edition, pages
IEEE, 2014
Series
IEEE Vehicular Technology Conference Proceedings, ISSN 1550-2252
Keywords
Power Consumption, Wireless Sensor Nodes, Min(N, T) Policy, Spectrum Sharing Systems
National Category
Telecommunications
Identifiers
urn:nbn:se:bth-6557 (URN)000368161900244 ()978-1-4799-4482-8 (ISBN)
Conference
IEEE 79th Vehicular Technology Conference (VTC-Spring),Seoul, Korea
Available from: 2014-11-18 Created: 2014-11-17 Last updated: 2016-06-22Bibliographically approved
Kabiri, C., Zepernick, H.-J. & Hung, T. (2014). On Power Consumption of Wireless Sensor Nodes with Min(N,T) Policy in Spectrum Sharing Systems. Paper presented at Swedish Communication Technologies Workshop. Paper presented at Swedish Communication Technologies Workshop. Västerås, Sweden : SweCTW
Open this publication in new window or tab >>On Power Consumption of Wireless Sensor Nodes with Min(N,T) Policy in Spectrum Sharing Systems
2014 (English)Conference paper, Oral presentation only (Other academic) Published
Abstract [en]

In this paper, we analyze the power consumption of wireless sensor nodes with min(N,T) policy and M/G/1 queue in the presence of Nakagami-m fading. In particular, this system setting is applied to a wireless sensor node operating in a cognitive radio system as secondary user in the presence of a primary user. As such, not only the queue policy influences the power consumption but also the interference power constraint imposed on the wireless sensor node by the primary user. Thus, a queued sleep/wake-up strategy is analyzed in order to mitigate the average power consumption of a sensor node using min(N,T) policy in the context of an M/G/1 queue and a spectrum sharing environment in the presence of signal fading. Numerical examples are presented to illustrate the impact of queuing parameters and fading channel on the power consumption of a wireless sensor node.

Place, publisher, year, edition, pages
Västerås, Sweden : SweCTW, 2014
Keywords
Power Consumption, Wireless Sensors, Spectrum Sharing Systems
National Category
Telecommunications
Identifiers
urn:nbn:se:bth-6529 (URN)oai:bth.se:forskinfoC2F8C756F7F45409C1257D970057980C (Local ID)oai:bth.se:forskinfoC2F8C756F7F45409C1257D970057980C (Archive number)oai:bth.se:forskinfoC2F8C756F7F45409C1257D970057980C (OAI)
Conference
Swedish Communication Technologies Workshop
Available from: 2014-11-24 Created: 2014-11-21 Last updated: 2015-06-30Bibliographically approved
Kabiri, C., Zepernick, H.-J. & Tran, H. (2013). Ergodic Capacity of Cognitive Relay Networks over α-µ fading Channels. In: : . Paper presented at Global Wireless Summit. Atlantic City, USA: IEEE
Open this publication in new window or tab >>Ergodic Capacity of Cognitive Relay Networks over α-µ fading Channels
2013 (English)Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, we investigate the ergodic capacity for an underlay cognitive relay network over α-µ fading channels. In particular, we assume the channels to be independent non-identically distributed α-µ random variables and analyze the system performance subject to a peak interference power constraint. Numerical results are presented to evaluate the effect of fading parameters on the ergodic capacity of the system.

Place, publisher, year, edition, pages
Atlantic City, USA: IEEE, 2013
Keywords
Ergodic Capacity, Cognitive Relay Networks
National Category
Telecommunications
Identifiers
urn:nbn:se:bth-6371 (URN)000332186700077 ()oai:bth.se:forskinfo9832C11044640743C1257BD9004DE7E8 (Local ID)oai:bth.se:forskinfo9832C11044640743C1257BD9004DE7E8 (Archive number)oai:bth.se:forskinfo9832C11044640743C1257BD9004DE7E8 (OAI)
External cooperation:
Conference
Global Wireless Summit
Available from: 2015-05-25 Created: 2013-09-01 Last updated: 2016-09-08Bibliographically approved
Sibomana, L., Tran, H., Zepernick, H.-J. & Kabiri, C. (2013). On Non-zero Secrecy Capacity and Outage Probability of Cognitive Radio Networks. In: : . Paper presented at Global Wireless Summit. Atlantic City, USA: IEEE
Open this publication in new window or tab >>On Non-zero Secrecy Capacity and Outage Probability of Cognitive Radio Networks
2013 (English)Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, we consider a spectrum sharing cognitive radio network (CRN) in the presence of an eavesdropper (EAV) who illegally listens to the primary user (PU) communication. Under the PU outage and the secondary user (SU) peak transmit power constraints, the adaptive transmit power policy of the SU transmitter (SU-Tx) is obtained. Then, expressions for the probability of existence of a non-zero secrecy capacity of the primary network and the outage probability of the secondary network are derived. Numerical results are provided to investigate the impact of the SU-Tx peak transmit power, PU average transmit power and channel mean powers among users on the outage probability and probability of existence of a nonzero secrecy capacity. Our results illustrate that the probability of existence of a non-zero secrecy capacity strongly depends on the channel conditions among users and SU-Tx adaptive transmit power policy.

Place, publisher, year, edition, pages
Atlantic City, USA: IEEE, 2013
Keywords
Cognitive Radio Networks, Secrecy Capacity, Outage Probability
National Category
Telecommunications
Identifiers
urn:nbn:se:bth-6659 (URN)000332186700076 ()oai:bth.se:forskinfo16AD14246DACA87BC1257BD9004D9634 (Local ID)oai:bth.se:forskinfo16AD14246DACA87BC1257BD9004D9634 (Archive number)oai:bth.se:forskinfo16AD14246DACA87BC1257BD9004D9634 (OAI)
Conference
Global Wireless Summit
Available from: 2014-07-17 Created: 2013-09-01 Last updated: 2017-05-22Bibliographically approved
Kabiri, C., Zepernick, H.-J., Sibomana, L. & Tran, H. (2013). On the Performance of Cognitive Radio Networks with DF Relay Assistance Under Primary Outage Constraint Using SC and MRC. In: : . Paper presented at IEEE Internationl Conference on Advanced Technologies for Communications. Ho Chi Minh City, Vietnam: IEEE
Open this publication in new window or tab >>On the Performance of Cognitive Radio Networks with DF Relay Assistance Under Primary Outage Constraint Using SC and MRC
2013 (English)Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, we analyze the performance of a cognitive radio network (CRN) that is assisted by a single relay. In particular, the secondary user (SU) transmitter (SU-Tx) and the secondary relay (SR) utilize the licensed frequency band of the primary user (PU). To protect the PU from harmful interference, the SU-Tx and SR must regulate their transmit power to satisfy the outage probability constraint of the PU. System performance in terms of outage probability is analyzed for selection combining (SC) and maximal ratio combining (MRC). Specifically, a power allocation policy and analytical expressions for the outage probability with SC and MRC are derived. Our results show that the upper bound of the outage probability corresponding to MRC is equal to the exact expression for the outage probability for SC.

Place, publisher, year, edition, pages
Ho Chi Minh City, Vietnam: IEEE, 2013
Keywords
Outage Probability, Cognitive Radio Network, Decode-and-Forward Relay, Primary Outage Constraint, Selection Combining, Maximal Ratio Combining
National Category
Telecommunications
Identifiers
urn:nbn:se:bth-6657 (URN)000331178400003 ()oai:bth.se:forskinfoEC016C2D08189412C1257C0B002A004C (Local ID)978-1-4799-1086-1 (ISBN)oai:bth.se:forskinfoEC016C2D08189412C1257C0B002A004C (Archive number)oai:bth.se:forskinfoEC016C2D08189412C1257C0B002A004C (OAI)
Conference
IEEE Internationl Conference on Advanced Technologies for Communications
Available from: 2014-07-17 Created: 2013-10-21 Last updated: 2017-05-22Bibliographically approved
Kabiri, C., Zepernick, H.-J. & Tran, H. (2013). Outage Analysis of Cognitive Relay Networks over alpha-mu Fading Channels. In: : . Paper presented at International Wireless Communications and Mobile Computing Conference. Sardinia, Italy: IEEE
Open this publication in new window or tab >>Outage Analysis of Cognitive Relay Networks over alpha-mu Fading Channels
2013 (English)Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, we investigate the performance of an underlay cognitive relay network over α-μ fading channels. In particular, we assume non-identical fading parameters and derive an analytical expression for the outage probability of a dual-hop underlay system subject to a peak interference power constraint. Numerical and simulation results are presented to evaluate the effect of fading parameters on the outage probability of the system.

Place, publisher, year, edition, pages
Sardinia, Italy: IEEE, 2013
Keywords
Outage analysis, cognitive relay networks, α-μ fading channels
National Category
Telecommunications
Identifiers
urn:nbn:se:bth-6783 (URN)10.1109/IWCMC.2013.6583656 (DOI)000327357800129 ()oai:bth.se:forskinfo9A28AA593A102AAEC1257BD7005B06A3 (Local ID)978-1-4673-2479-3 (ISBN)oai:bth.se:forskinfo9A28AA593A102AAEC1257BD7005B06A3 (Archive number)oai:bth.se:forskinfo9A28AA593A102AAEC1257BD7005B06A3 (OAI)
Conference
International Wireless Communications and Mobile Computing Conference
Available from: 2014-01-07 Created: 2013-08-30 Last updated: 2017-03-07Bibliographically approved
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