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The design of the analog demodulator for receivers with low-resolutionanalog-to-digital converters (ADC) is investigated. For infinite ADCresolution, demodulation to baseband with M = 2 orthogonal sinusoidal functions(quadrature demodulation) is an optimum design choice. For receive systemswhich are restricted to ADC with low amplitude resolution we show here thatthis classical demodulation approach is suboptimal. To this end we analyze thetheoretical channel parameter estimation performance based on a simplepessimistic characterization of the Fisher information measure when forming M >2 analog demodulation channels prior to an ADC with 1-bit amplitude resolution.In order to emphasize that this inside is also true for communication problems,we provide an additional discussion on the behavior of the Shannon informationmeasure under overdemodulation and 1-bit quantization.

Overdemodulation for High-Performance Receivers with Low-Resolution ADC