Channel State Prediction in Cognitive Radio, Part I: Response Delays in Practical Hardware Platforms

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Executive Summary

Cognitive radio has been put forward to make efficient use of scarce radio frequency spectrum. Spectrum sensing is the cornerstone of cognitive radio. As a part of the effort toward building a cognitive radio network testbed, the authors have demonstrated real-time spectrum sensing. However, current hardware platforms for cognitive radio introduce time delays that actually undermine the accuracy of spectrum sensing. The time delay, named response delay, incurred by hardware and software can be measured at the receiving antenna and the transmitting antenna co-located at a Secondary User (SU).

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