2026-04-14T05:36:49Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/1019122026-01-27T02:22:01Zcom_2072_1033col_2072_452950

Sparse multiple relay selection for network beamforming with individual power constraints using semidefinite relaxation Blanco, Luis Nájar Martón, Montserrat Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions Universitat Politècnica de Catalunya. SPCOM - Grup de Recerca de Processament del Senyal i Comunicacions Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Processament del senyal::Processament de matrius (arrays) Signal processing Wireless communication systems Combinatorial optimization Wireless relay network Multiple relay selection Distributed beamforming Sparsity-promoting norms Semidefinite relaxation Tractament del senyal Comunicació sense fil, Sistemes de This paper deals with the multiple relay selection problem in two-hop wireless cooperative networks with individual power constraints at the relays. In particular, it addresses the problem of selecting the best subset of K cooperative nodes and their corresponding beamforming weights so that the signal-to-noise ratio (SNR) is maximized at the destination. This problem is computationally demanding and requires an exhaustive search over all the possible combinations. In order to reduce the complexity, a new suboptimal method is proposed. This technique exhibits a near-optimal performance with a computational burden that is far less than the one needed in the combinatorial search. The proposed method is based on the use of the l1-norm squared and the Charnes-Cooper transformation and naturally leads to a semidefinite programming relaxation with an affordable computational cost. Contrary to other approaches in the literature, the technique exposed herein is based on the knowledge of the second-order statistics of the channels and the relays are not limited to cooperate with full power. Peer Reviewed Postprint (author's final draft) 2016-02 Article Blanco, L., Najar, M. Sparse multiple relay selection for network beamforming with individual power constraints using semidefinite relaxation. "IEEE transactions on wireless communications", Febrer 2016, vol. 15, núm. 2, p. 1206-1217. 1536-1276 https://hdl.handle.net/2117/101912 10.1109/TWC.2015.2487439 eng http://ieeexplore.ieee.org/document/7299322/ info:eu-repo/grantAgreement/EC/FP7/318306/EU/Network of Excellence in Wireless COMmunications #/NEWCOM# Open Access 12 p. application/pdf