Power control of spectrum-sharing in fading environment with partial channel state information

Abdoulaye Bagayoko (1) , Inbar Fijalkow (2) , Patrick Tortelier (3)

1 NEC HPC Europe
2 ETIS - UMR 8051 - Equipes Traitement de l'Information et Systèmes
3 Orange Labs [Issy les Moulineaux]

This paper addresses the spectrum-sharing for wireless communication where a cognitive or secondary user shares a spectrum with an existing primary user (and interferes with it). We propose two lower bounds, for the primary user mean rate, depending on the channel state information available for the secondary-user power control and on the type of constraint for spectrum access. Several power control policies are investigated and the achieved primary-user mean rates are compared with the lower bounds. Specially, assuming all pairs of transmitter-receiver are achieving real-time delay-sensitive applications, we propose a novel secondary-user power control policy to ensure for both users, at a given occurrence, predefined minimum instantaneous rates. This power control uses only the secondary-user direct links gains estimations (secondary-to-secondary link and secondary-to-primary link). We take into account all links in the network.

Mots clés: cognitive radio; spectrum sharing; power allocation; partial channel state information

Domaines: Traitement du signal et de l'image [eess.SP]; Traitement du signal et de l'image [eess.SP]

Abdoulaye Bagayoko, Inbar Fijalkow, Patrick Tortelier. Power control of spectrum-sharing in fading environment with partial channel state information. IEEE Transactions on Signal Processing, 2011, 59 (5), pp.2244 - 2256. ⟨10.1109/TSP.2011.2107905⟩. ⟨hal-00664183⟩