Outage analysis of causal cognitive radio channel

Faheem A. Khan, T. Ratnarajah, M. Sellathurai, S. Prakriya

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

In this paper, we first analyze the outage performance of two user cognitive radio channel where the cognitive user causally obtains primary user's message knowledge. Specifically, we consider cognitive rayleigh fading channel where the cognitive user uses superposition coding to relay the primary user's message to compensate for the interference caused by its own transmission to the primary receiver. We find the mutual information expressions at primary and cognitive receivers by classifying it in different cases. Results show that non-zero capacity is obtained at cognitive receiver while maintaining outage rate of the primary unchanged. It is also shown that additional diversity is obtained at primary receiver due to relaying by the cognitive user. We then extend the single user case to multiple cognitive users. It is shown that using multiuser diversity effect and cognitive users cooperation, significant increase in the mutual information at cognitive receiver for a given outage probability is achieved.

Original languageEnglish
Title of host publicationProceedings - 2009 1st UK-India International Workshop on Cognitive Wireless Systems, UKIWCWS 2009
DOIs
Publication statusPublished - 1 Dec 2009
Externally publishedYes
Event1st UK-India International Workshop on Cognitive Wireless Systems - New Delhi, India
Duration: 11 Dec 200912 Dec 2009
Conference number: 1
https://www.scimagojr.com/journalsearch.php?q=19700202704&tip=sid&clean=0

Conference

Conference1st UK-India International Workshop on Cognitive Wireless Systems
Abbreviated titleUKIWCWS 2009
CountryIndia
CityNew Delhi
Period11/12/0912/12/09
Internet address

Fingerprint

Cognitive radio
Outages
radio
recipient
Rayleigh fading
Fading channels
coding
interference

Cite this

Khan, F. A., Ratnarajah, T., Sellathurai, M., & Prakriya, S. (2009). Outage analysis of causal cognitive radio channel. In Proceedings - 2009 1st UK-India International Workshop on Cognitive Wireless Systems, UKIWCWS 2009 [5749415] https://doi.org/10.1109/UKIWCWS.2009.5749415
Khan, Faheem A. ; Ratnarajah, T. ; Sellathurai, M. ; Prakriya, S. / Outage analysis of causal cognitive radio channel. Proceedings - 2009 1st UK-India International Workshop on Cognitive Wireless Systems, UKIWCWS 2009. 2009.
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Khan, FA, Ratnarajah, T, Sellathurai, M & Prakriya, S 2009, Outage analysis of causal cognitive radio channel. in Proceedings - 2009 1st UK-India International Workshop on Cognitive Wireless Systems, UKIWCWS 2009., 5749415, 1st UK-India International Workshop on Cognitive Wireless Systems, New Delhi, India, 11/12/09. https://doi.org/10.1109/UKIWCWS.2009.5749415

Outage analysis of causal cognitive radio channel. / Khan, Faheem A.; Ratnarajah, T.; Sellathurai, M.; Prakriya, S.

Proceedings - 2009 1st UK-India International Workshop on Cognitive Wireless Systems, UKIWCWS 2009. 2009. 5749415.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

TY - GEN

T1 - Outage analysis of causal cognitive radio channel

AU - Khan, Faheem A.

AU - Ratnarajah, T.

AU - Sellathurai, M.

AU - Prakriya, S.

PY - 2009/12/1

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N2 - In this paper, we first analyze the outage performance of two user cognitive radio channel where the cognitive user causally obtains primary user's message knowledge. Specifically, we consider cognitive rayleigh fading channel where the cognitive user uses superposition coding to relay the primary user's message to compensate for the interference caused by its own transmission to the primary receiver. We find the mutual information expressions at primary and cognitive receivers by classifying it in different cases. Results show that non-zero capacity is obtained at cognitive receiver while maintaining outage rate of the primary unchanged. It is also shown that additional diversity is obtained at primary receiver due to relaying by the cognitive user. We then extend the single user case to multiple cognitive users. It is shown that using multiuser diversity effect and cognitive users cooperation, significant increase in the mutual information at cognitive receiver for a given outage probability is achieved.

AB - In this paper, we first analyze the outage performance of two user cognitive radio channel where the cognitive user causally obtains primary user's message knowledge. Specifically, we consider cognitive rayleigh fading channel where the cognitive user uses superposition coding to relay the primary user's message to compensate for the interference caused by its own transmission to the primary receiver. We find the mutual information expressions at primary and cognitive receivers by classifying it in different cases. Results show that non-zero capacity is obtained at cognitive receiver while maintaining outage rate of the primary unchanged. It is also shown that additional diversity is obtained at primary receiver due to relaying by the cognitive user. We then extend the single user case to multiple cognitive users. It is shown that using multiuser diversity effect and cognitive users cooperation, significant increase in the mutual information at cognitive receiver for a given outage probability is achieved.

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KW - Complementary cumulative distribution function

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Khan FA, Ratnarajah T, Sellathurai M, Prakriya S. Outage analysis of causal cognitive radio channel. In Proceedings - 2009 1st UK-India International Workshop on Cognitive Wireless Systems, UKIWCWS 2009. 2009. 5749415 https://doi.org/10.1109/UKIWCWS.2009.5749415