ePrints@IIScePrints@IISc Home | About | Browse | Latest Additions | Advanced Search | Contact | Help

Optimal Relay and Antenna Selection in MIMO Cognitive Relay Network with Imperfect CSI

Das, P and Sarvendranath, R (2020) Optimal Relay and Antenna Selection in MIMO Cognitive Relay Network with Imperfect CSI. In: 2020 IEEE Wireless Communications and Networking Conference, 25 May 2020, South Korea.

[img] PDF
iee_wir_com_net_con_2020.pdf - Published Version
Restricted to Registered users only

Download (207kB) | Request a copy
Official URL: https://dx.doi.org/10.1109/WCNC45663.2020.9120550


Cooperative relaying and multiple-input multiple-output (MIMO) transmission technologies exploit spatial diversity to improve the performance of the secondary users in an underlay cognitive radio network. We consider a MIMO cognitive relay network in which a secondary source and multiple relays have imperfect channel state information (CSI) of the interference links to the primary receiver. They sufficiently back-off their transmit powers on the basis of such CSI in order to adhere to an interference outage constraint. We propose an optimal relay and antenna selection scheme, which jointly selects a relay between the source and destination, a transmit antenna at the source, and a receive antenna at the destination to maximize the end-to-end signal-to-interference-plus-noise ratio (SINR) at the destination. To demonstrate the advantages of our proposed framework, we derive closed-form expression for the outage probability of the secondary network under non-identically distributed Rayleigh fading channels. We also derive an insightful expression for the asymptotic outage probability for high SINR and show that the diversity gain is lost when the interference power constraint is fixed. We then consider a practical scenario where the secondary users have only the mean channel power gains of the interference links. Under such CSI, we also derive an expression for the outage probability, and show that this can be used as a better performance/complexity tradeoff for high SINR. © 2020 IEEE.

Item Type: Conference Paper
Publication: IEEE Wireless Communications and Networking Conference, WCNC
Publisher: Institute of Electrical and Electronics Engineers Inc.
Additional Information: The copyright of this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords: Cognitive radio; Fading channels; MIMO systems; Outages; Probability; Rayleigh fading; Receiving antennas; Relay control systems; Signal interference; Signal to noise ratio, Asymptotic outage probabilities; Closed-form expression; Cognitive relay networks; Imperfect channel state information; Interference power constraints; Multiple input multiple output transmissions; Signal to interference plus noise ratio; Underlay cognitive radios, Channel state information
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 18 Aug 2020 10:14
Last Modified: 18 Aug 2020 10:14
URI: http://eprints.iisc.ac.in/id/eprint/65987

Actions (login required)

View Item View Item