Compressive quantization in software defined receivers

Modern analog-to-digital converters (A/Ds) are composite structures that contain one or more internal A/Ds. The composite A/Ds carry out significant amount of mixed-signal processing in addition to the quantization performed by the internal A/Ds. Exploiting specific features of mixed-signal processing and/or specific properties of digitized signals enables improvement in performance of the composite A/Ds without increasing the burden imposed on their internal A/Ds. In this paper, this approach to the A/D development is named “compressive quantization” by analogy with “compressive sampling” that allows sampling rate reduction for sparse signals below the Nyquist rate.

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