Robust Symbol Level Precoding for Overlay Cognitive Radio Networks

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Robust Symbol Level Precoding for Overlay Cognitive Radio Networks

Liu, Lu; Masouros, Christos; Swindlehurst, A Lee; (2024) Robust Symbol Level Precoding for Overlay Cognitive Radio Networks. IEEE Transactions on Wireless Communications , 23 (2) pp. 1403-1415. 10.1109/twc.2023.3289190. Green open access

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Abstract

This paper focuses on designing robust symbol-level precoding (SLP) in an overlay cognitive radio (CR) network, where the primary and secondary networks transmit signals concurrently. When the primary base station (PBS) shares data and perfect channel state information (CSI) with the cognitive base station (CBS), we derive an SLP approach that minimizes the CR transmission power and satisfies symbol-wise Safety Margin (SM) constraints of both primary users (PUs) and cognitive users (CUs). The resulting optimization has a quadratic objective and linear inequality (LI) constraints, which can be solved by standard convex methods. For the case of imperfect CSI from the PBS, we propose robust SLP schemes. First, with a norm-bounded CSI error model to approximate the uncertain channels, we adopt a max-min philosophy to conservatively achieve robust SLP constraints. Second, we use the additive quantization noise model (AQNM) to describe the quantized PBS CSI and employ a stochastic constraint to formulate the problem. Both robust approaches also result in a quadratic objective with LI constraints. Simulation results show that, rather than simply trying to eliminate the network’s cross-interference, the proposed robust SLP schemes enable the primary and secondary networks to aid each other in meeting their quality of service constraints.

Type:	Article
Title:	Robust Symbol Level Precoding for Overlay Cognitive Radio Networks
Open access status:	An open access version is available from UCL Discovery
DOI:	10.1109/twc.2023.3289190
Publisher version:	https://doi.org/10.1109/twc.2023.3289190
Language:	English
Additional information:	This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords:	Cognitive radio, symbol-level precoding, constructive interference, robust precoding, quantization
UCL classification:	UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI:	https://discovery.ucl.ac.uk/id/eprint/10173142