A new cognitive radio strategy for SWIPT system

Autor:	Minli Yao, Feifei Gao, Fengchao Zhu
Rok vydání:	2014
Předmět:	Mathematical optimization Cognitive radio Duality gap business.industry MIMO Wireless Relaxation (approximation) Maximization Covariance business Upper and lower bounds Mathematics
Zdroj:	HMWC
DOI:	10.1109/hmwc.2014.7000217
Popis:	In this paper, we consider the rate maximization of a new cognitive ratio (CR) scenario when multiple primary users (PU) are operating under the simultaneous wireless information and power transfer (SWIPT) mode. Since the rate maximization problem is NP-hard, we separate the derivation approach into the following two steps: (i) we prove that the optimal transmit covariance is of rank-one; (ii) we apply the semi-definite programming (SDP) relaxation. Two suboptimal algorithms that provide the upper bound and the lower bound of the original solutions are proposed to cope with this NP-hard problem. The duality gap is demonstrated to be very small by Monte Carlo simulations.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d58152c8358c1c4ee2917b852e1019da https://doi.org/10.1109/hmwc.2014.7000217 Zobrazit plný text záznamu