Abstract
The quadrature sampling method is very common in radar, sonar and communication applications. In this paper, an adaptive method for the retrieval and enhancement of sinusoids in a quadrature sampling system is developed from a decomposed notch filter structure, consisting of cascaded or parallel first order complex notch filter modules. The proposed ALE (Adaptive Line Enhancer) can be optimized module by module individually using an identical adaptive algorithm. This adaptive algorithm is a steepest descent version designed to find a maximum. The idea behind the proposed method is that the complex representation of a sinusoid has a constant modulus or envelope.
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