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Cooperative sensing among cognitive radios (2006)
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| Venue: | In Proc. of the IEEE International Conference on Communications (ICC |
| Citations: | 289 - 15 self |
BibTeX
@INPROCEEDINGS{Mishra06cooperativesensing,
author = {Shridhar Mubaraq Mishra and Anant Sahai and Robert W. Brodersen},
title = {Cooperative sensing among cognitive radios},
booktitle = {In Proc. of the IEEE International Conference on Communications (ICC},
year = {2006},
pages = {1658--1663}
}
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Abstract
Abstract — Cognitive Radios have been advanced as a technology for the opportunistic use of under-utilized spectrum since they are able to sense the spectrum and use frequency bands if no Primary user is detected. However, the required sensitivity is very demanding since any individual Radio might face a deep fade. We propose light-weight cooperation in sensing based on hard decisions to mitigate the sensitivity requirements on individual radios. We show that the “link budget ” that system designers have to reserve for fading is a significant function of the required probability of detection. Even a few cooperating users (∼10-20) facing independent fades are enough to achieve practical threshold levels by drastically reducing the individual detection requirements. Hard decisions perform almost as well as soft decisions in achieving these gains. Shadowing correlation limits these gains and hence a few independent users perform better than many correlated users. Unfortunately, cooperative gain is very sensitive to adversarial/failing Cognitive Radios. Radios that fail in a known way (always report the presence/absence of a Primary user) can be compensated for by censoring them. On the other hand, radios that fail in unknown ways or may be malicious, introduce a bound on achievable sensitivity reductions. As a rule of thumb, if we believe that 1
Keyphrases
cognitive radio cooperative sensing hard decision individual radio primary user individual detection requirement presence absence independent fade independent user system designer sensitivity requirement light-weight cooperation cooperative gain achievable sensitivity reduction many correlated user required sensitivity cooperating user opportunistic use significant function abstract cognitive radio required probability unknown way deep fade use frequency band soft decision link budget correlation limit known way under-utilized spectrum practical threshold level
