Underlay Cognitive Radio Systems with Improper Gaussian Signaling: Outage Performance Analysis

Osama Amin, Walid Abediseid, Mohamed-Slim Alouini

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


Improper Gaussian signaling has the ability over proper (conventional) Gaussian signaling to improve the achievable rate of systems that suffer from interference. In this paper, we study the impact of using improper Gaussian signaling on the performance limits of the underlay cognitive radio system by analyzing the achievable outage probability of both the primary user (PU) and secondary user (SU). We derive the exact outage probability expression of the SU and construct upper and lower bounds of the PU outage probability which results in formulating an approximate expression of the PU outage probability. This allows us to design the SU signal by adjusting its transmitted power and the circularity coefficient to minimize the SU outage probability while maintaining a certain PU quality-of-service. Finally, we evaluate the derived expressions for both the SU and the PU and the corresponding adaptive algorithms by numerical results.
Original languageEnglish (US)
Pages (from-to)4875-4887
Number of pages13
JournalIEEE Transactions on Wireless Communications
Issue number7
StatePublished - Mar 29 2016


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