Abstract:This paper presents a compact, low-cost spectrum sensor with very large dynamic range, to detect arbitrarily modulated input signals with respect to identifying the spectrum holes available for cognitive radio applications. The sensing technique is based on the combination of a tunable pre-selector filter with a four-port circuit consisting of logarithmic detectors. Since the four-port is a passive circuit, the sensed signal is processed without requiring additional power consuming nonlinear circuits (like mix… Show more
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