Chapter 18. Spectrum Sensing Based on Spectral Correlation
Chad M. Spooner
NorthWest Research Associates, Monterey, California
Richard B. Nicholls
Tektronix Incorporated, Beaverton Oregon

18.1. Introduction

Within the animal kingdom, the eye is an excellent sensor of the visible-light portion of the electromagnetic spectrum—it is sensitive to total received energy, the relative contributions from distinct spectral subbands, and temporal variations indicative of motion. The eye evolved in the context of the Earth's atmosphere and the Sun's radiation, which combine to provide a window of relative transparency called the visible spectrum. The eye operates within its external constraints to perform sensing that is used by the brain to build a picture of ...

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