eprintid: 10193634 rev_number: 7 eprint_status: archive userid: 699 dir: disk0/10/19/36/34 datestamp: 2024-06-20 09:31:47 lastmod: 2024-06-20 09:31:47 status_changed: 2024-06-20 09:31:47 type: article metadata_visibility: show sword_depositor: 699 creators_name: Yao, J creators_name: Jin, M creators_name: Wu, T creators_name: Li, Q creators_name: Wong, KK title: Joint Optimization for Over-the-Air Computation in AF Relay-Assisted Cognitive Radio Networks ispublished: inpress divisions: UCL divisions: B04 divisions: C05 divisions: F46 note: This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions. abstract: This paper investigates the over-the-air computation (AirComp) in a cognitive radio (CR) data network, which contains a primary network, a secondary network, and an amplifyand-forward (AF) relay. There are sensors in each network that transmit data to their corresponding access point (AP). The aim of the AF relay is to improve the computation performance of the two networks. We study the sum mean-square-error (MSE) minimization problem, named as SMSE-min problem, subject to the transmit power constraints at the AF relay and the sensors in the two networks. It is not trivial to obtain the optimal solution of the formulated non-convex problem due to the coupled optimization variables. We propose an alternating optimization algorithm for alternatively optimizing four sub-problems about the aggregation beamforming at two APs, transmit scaling factors at the sensors, and the AF matrix at the relay, and obtain the locally optimal solution, where the closed-form solution can be obtained in each sub-problem. Numerical results show the superior sum MSE performance of our proposed scheme date: 2024-06-04 date_type: published publisher: Institute of Electrical and Electronics Engineers (IEEE) official_url: http://dx.doi.org/10.1109/tvt.2024.3409366 oa_status: green full_text_type: other language: eng primo: open primo_central: open_green verified: verified_manual elements_id: 2286992 doi: 10.1109/TVT.2024.3409366 lyricists_name: Wong, Kai-Kit lyricists_id: KWONG98 actors_name: Flynn, Bernadette actors_id: BFFLY94 actors_role: owner full_text_status: public publication: Proceedings of the IEEE Transactions on Vehicular Technology pagerange: 1-6 citation: Yao, J; Jin, M; Wu, T; Li, Q; Wong, KK; (2024) Joint Optimization for Over-the-Air Computation in AF Relay-Assisted Cognitive Radio Networks. Proceedings of the IEEE Transactions on Vehicular Technology pp. 1-6. 10.1109/TVT.2024.3409366 <https://doi.org/10.1109/TVT.2024.3409366>. (In press). Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/10193634/1/Joint_Optimization_for_Over-the-Air_Computation_in_AF_Relay-Assisted_Cognitive_Radio_Networks.pdf