The Impact of Opportunistic User Scheduling on Outage Probability of CR-MIMO Systems

Donghun LEE  Byung Jang JEONG  

IEICE TRANSACTIONS on Communications   Vol.E97-B   No.3   pp.686-690
Publication Date: 2014/03/01
Online ISSN: 1745-1345
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
cognitive radio (CR),  multiple-input multiple-output (MIMO),  outage probability,  opportunistic user scheduling,  diversity order,  SNR gain,  multi-user diversity (MUD),  

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In this paper, we study the impact of opportunistic user scheduling on the outage probability of cognitive radio (CR) multiple-input multiple-output (MIMO) systems in the high power region where the peak transmit power constraint is higher than the peak interference constraint. The primary contributions of this paper are the derivation of exact closed-form expressions of the proposed scheduled CR-MIMO systems for outage probability and asymptotic analysis to quantify the diversity order and signal to noise ratio (SNR) gain. Through exact analytical results, we provide the achievable outage probability of the proposed scheduled systems as a function of SNR. Also, through asymptotic analysis, we show that the scheduled CR-MIMO systems provide some diversity order gain over the non-scheduled CR-MIMO systems which comes from multi-user diversity (MUD). Also, the SNR gain of the proposed scheduled systems is identical to that of the non-scheduled CR-MIMO systems.