Robust Two-Way Cognitive Relaying: Precoder Designs under Interference Constraints and Imperfect CSI

We present various robust precoder designs for two-way relaying in a cognitive radio network, where a pair of cognitive (or secondary) transceiver nodes communicate with each other assisted by a set of cognitive two-way relays. The secondary nodes share the spectrum with a licensed primary user (PU)...

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Veröffentlicht in:	IEEE transactions on wireless communications Jg. 13; H. 5; S. 2478 - 2489
Hauptverfasser:	Ubaidulla, P., Aissa, Sonia
Format:	Journal Article
Sprache:	Englisch
Veröffentlicht:	New York, NY IEEE 01.05.2014 Institute of Electrical and Electronics Engineers The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:	Antennas Applied sciences Channels Cognitive radio cognitive radio networks Convex functions Cooperative networks Errors Exact sciences and technology Interference Plutonium Radiocommunication specific techniques Radiocommunications Receivers Relaying Relays robust precoder design Robustness Systems, networks and services of telecommunications Telecommunications Telecommunications and information theory Transceivers Transmission and modulation (techniques and equipments) Transmitters. Receivers two-way relaying Vectors Performance evaluation Relaying Parameter estimation Relay Coding circuit Cooperative systems Cooperative networks robust precoder design Convex programming Transceiver cognitive radio networks Transmitting antenna Channel estimation Numerical simulation two-way relaying Receiving antenna Antenna array Radio communication Software radio
ISSN:	1536-1276, 1558-2248
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Abstract	We present various robust precoder designs for two-way relaying in a cognitive radio network, where a pair of cognitive (or secondary) transceiver nodes communicate with each other assisted by a set of cognitive two-way relays. The secondary nodes share the spectrum with a licensed primary user (PU) node while keeping the interference to the PU below a specified threshold. The PU node and the cognitive transceivers employ single transmit/receive antennas whereas the secondary relay nodes employ multiple transmit/receive antennas. The proposed precoder designs ensure robust performance in the presence of errors in the channel state information (CSI). Such robust designs are of significant interest since in practice it is very difficult to obtain perfect CSI. We consider CSI errors with two different types of characterization and corresponding robust designs. First, we consider robust relay precoder designs that are applicable when CSI errors have known first and second moments. Next, we consider robust designs that are applicable when the CSI error can be characterized in terms of spherical uncertainty region. We show that the proposed designs can be reformulated as convex optimization problems that can be solved efficiently. Through numerical simulations and comparisons we illustrate the performance of the proposed designs.
AbstractList	We present various robust precoder designs for two-way relaying in a cognitive radio network, where a pair of cognitive (or secondary) transceiver nodes communicate with each other assisted by a set of cognitive two-way relays. The secondary nodes share the spectrum with a licensed primary user (PU) node while keeping the interference to the PU below a specified threshold. The PU node and the cognitive transceivers employ single transmit/receive antennas whereas the secondary relay nodes employ multiple transmit/receive antennas. The proposed precoder designs ensure robust performance in the presence of errors in the channel state information (CSI). Such robust designs are of significant interest since in practice it is very difficult to obtain perfect CSI. We consider CSI errors with two different types of characterization and corresponding robust designs. First, we consider robust relay precoder designs that are applicable when CSI errors have known first and second moments. Next, we consider robust designs that are applicable when the CSI error can be characterized in terms of spherical uncertainty region. We show that the proposed designs can be reformulated as convex optimization problems that can be solved efficiently. Through numerical simulations and comparisons we illustrate the performance of the proposed designs.
Author	Aissa, Sonia Ubaidulla, P.
Author_xml	– sequence: 1 givenname: P. surname: Ubaidulla fullname: Ubaidulla, P. email: ubaidulla.p@iiit.ac.in organization: Signal Process. & Commun. Res. Center (SPCRC), Int. Inst. of Inf. Technol. (IIIT), Hyderabad, India – sequence: 2 givenname: Sonia surname: Aissa fullname: Aissa, Sonia email: aissa@emt.inrs.ca organization: Inst. Nat. de la Rech. Sci., Univ. of Quebec, Montreal, QC, Canada
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Keywords	Performance evaluation Relaying Parameter estimation Relay Coding circuit Cooperative systems Cooperative networks robust precoder design Convex programming Transceiver cognitive radio networks Transmitting antenna Channel estimation Numerical simulation two-way relaying Receiving antenna Antenna array Radio communication Software radio
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SubjectTerms	Antennas Applied sciences Channels Cognitive radio cognitive radio networks Convex functions Cooperative networks Errors Exact sciences and technology Interference Plutonium Radiocommunication specific techniques Radiocommunications Receivers Relaying Relays robust precoder design Robustness Systems, networks and services of telecommunications Telecommunications Telecommunications and information theory Transceivers Transmission and modulation (techniques and equipments) Transmitters. Receivers two-way relaying Vectors
Title	Robust Two-Way Cognitive Relaying: Precoder Designs under Interference Constraints and Imperfect CSI
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