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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Bibliographic Details
Published in:IEEE transactions on wireless communications Vol. 13; no. 5; pp. 2478 - 2489
Main Authors: Ubaidulla, P., Aissa, Sonia
Format: Journal Article
Language:English
Published: New York, NY IEEE 01.05.2014
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
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
Online Access:Get full text
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Description
Summary: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.
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ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2014.031714.130082