Document Type
Article
Publication Date
2009
First Page
1
Last Page
4
DOI
10.1109/ICCCN.2009.5235213
Abstract
Cognitive radios aim to coexist in the unused spectrum bands which are licensed to primary users without harming the primary transmission/reception. For a cognitive radio, it is important to detect the band in which the primary is operating as fast as possible and with high reliability in order to adapt its transmission. In this work, we propose P-partitioning method in combination with energy detectors for the search of the band that the primary user is operating. In the P-partitioning method, the spectrum bands are categorized into P groups and the group that the primary band belongs to is detected in a recursive fashion. The energy detector operates on each group and the test statistics is the total energy received in the bands belonging to the group. The proposed search technique has detection time PlogP(N), where N is the number of bands in the spectrum. When P = N, the proposed scheme is equivalent to linear search with detection time N. We study the performance of the proposed scheme for a single non-cooperative radio and also for multiple cooperating radios. For a single cognitive radio, we provide an upper bound on the probability of correct detection which presents two different regimes of operation. In the low SNR regime, although it is counter-intuitive the partitioning improves the probability of detection. This is due an averaging effect when the signal energy in different bands are accumulated to obtain the energy contribution from a group. In the high SNR regime, performance degrades with partitioning. In addition, we observe that user cooperation improves the performance in the high SNR regimes.
Recommended Citation
Birsen Sirkeci-Mergen, Vishal Sawant, and Robert H. Morelos-Zaragoza. "A Trade-off Analysis of Energy Detectors and Partitioned Search for Primary Detection" Faculty Publications (2009): 1-4. https://doi.org/10.1109/ICCCN.2009.5235213
Comments
Published in Proceedings of 18th International Conference on Computer Communications and Networks, 2009. ICCCN 2009.
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