Title :
Optimal power allocation in opportunistic relaying with outdated CSI
Author :
Vicario, Jose ; Morell, Antoni ; Bel, Albert ; Seco-Granados, Gonzalo
Author_Institution :
Group of Signal Process. for Commun. & Navig. (SPCOMNAV), Univ. Autonoma de Barcelona (UAB), Barcelona
Abstract :
In this paper, we study the impact of outdated channel state information (CSI) on a cooperative system based on opportunistic relay selection (ORS). The study is carried out by obtaining an analytical expression for the outage probability, defined as the probability that the instantaneous mutual information is lower than a target rate. Besides, we propose the optimal power allocation aimed at minimizing the outage probability when the available CSI is subject to impairments. As shown in the paper, the proposed strategy provides significant gains when compared with uniform power allocation.
Keywords :
cooperative systems; diversity reception; resource allocation; cooperative system; opportunistic relay selection; optimal power allocation; outage probability; outdated channel state information; AWGN; Channel state information; Decoding; Delay; Navigation; Power system modeling; Power system relaying; Relays; Signal processing; System performance;
Conference_Titel :
Sensor Array and Multichannel Signal Processing Workshop, 2008. SAM 2008. 5th IEEE
Conference_Location :
Darmstadt
Print_ISBN :
978-1-4244-2240-1
Electronic_ISBN :
978-1-4244-2241-8
DOI :
10.1109/SAM.2008.4606822
