NDLI: Joint beamforming and scheduling scheme for underlay MIMO cognitive radio networks with imperfect channel knowledge

Content Provider	IEEE Xplore Digital Library
Author	Massaoudi, A. Sellami, N. Siala, M.
Copyright Year	2014
Description	Author affiliation: MEDIATRON Lab., Univ. of Carthage, Ariana, Tunisia (Massaoudi, A.; Siala, M.) \|\| LETI Lab., Univ. of Sfax, Sfax, Tunisia (Sellami, N.)
Abstract	Cognitive radio is a promising technique for efficient spectrum utilization in wireless systems. In this paper, we consider a multiple-input multiple-output (MIMO) underlay cognitive radio system where a large number of secondary users (SUs) can share the spectrum with a primary user (PU). We assume that the cognitive base station (CBS) does not have the full channel state information (CSI) from secondary users (SUs) and has imperfect CSI of the interference channel between the CBS and the primary receiver. We study the problem of secondary users scheduling under the constraint of interference to the PU while maximizing the throughput of the secondary system. In order to minimize the amount of required feedback, we propose a scheduling algorithm based on opportunistic beamforming (OB) and consisting of two steps. In the first step, in order to minimize the interference to the PU, we propose to generate orthogonal beams to the estimate of the interference channel. In the second step, the $N_{s}$ cognitive users (or antennas) having the highest signal to interference and noise ratios (SINRs) are selected for transmission. Since each SU is equipped with multiple antennas, we consider different possibilities of feeding back the SINRs from the SUs to the CBS and also consider the case where optimal combining based on Minimum Mean Square Error (MMSE) criterion is used.
Sponsorship	IEEE
Starting Page	1
Ending Page	5
File Size	452898
Page Count	5
File Format	PDF
ISBN	9781479937622
e-ISBN	9781479937646
DOI	10.1109/ComNet.2014.6840921
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-03-19
Publisher Place	Tunisia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Array signal processing Gram-Schmidt orthogonalization Secondary users scheduling Transmitting antennas Receiving antennas Imperfect channel state information Interference Opportunistic beamforming Vectors MIMO Cognitive radio Signal to noise ratio
Content Type	Text
Resource Type	Article

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