Cognitive Radio Networks by Ahmed Khattab Dmitri Perkins & Magdy Bayoumi

Author:Ahmed Khattab, Dmitri Perkins & Magdy Bayoumi
Language: eng
Format: epub
Publisher: Springer New York, New York, NY

Recent works exploited the bidirectional nature of some primary networks to enable SUs to infer the existence or the absence of a neighboring primary receiver [6, 7]. However, such schemes do not provide a way to measure the cumulative interference at the primary receiver. Another potential approach to collect information about nearby primary receivers is to detect the local oscillator leakage power emitted by the RF front-end of the primary receivers. Since such leakage power is typically weak, implementing a reliable detector is challenging. As per existing transceiver technologies, primary receiver detection through tracking the RF leakage power is only feasible for the detection of TV receivers. A more detailed discussion of the related work was presented in Chap. 3. Alternatively, cognitive user cooperation could be used to improve the accuracy of spectrum sensing. Collecting the spectrum sensing information from multiple cognitive radio nodes minimizes the uncertainty about the spectral opportunities. However, such cooperative techniques significantly reduce the goodput of the CRN due to the associated overhead traffic required for node cooperation and further complicate the CRN design (e.g., it might necessitates the need for an overlay subnetwork that is only responsible for coordinating the cooperation process). We conclude that there does not exist a practical—yet accurate—way to measure the interfere at the primary receivers based on today’s sensing technologies.

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