Spatial Σ-Δ Signal Acquisition for Wideband Beamforming Arrays

Konferenz: WSA 2016 - 20th International ITG Workshop on Smart Antennas
09.03.2016 - 11.03.2016 in München, Deutschland

Tagungsband: ITG-Fb. 261: WSA 2016

Seiten: 7Sprache: EnglischTyp: PDF

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Corey, Ryan M.; Singer, Andrew C. (University of Illinois at Urbana-Champaign, USA)

We consider spatial and spatio-temporal σ-δ modulation structures for wideband signal acquisition with dense sensor arrays. Using closely arranged sensors, the array oversamples the signal in space and applies coarse quantization to each sensor output. A σ-δ structure propagates quantization noise between sensors to shape the noise in space, just as a time-domain σ-δ converter shapes noise in frequency. The spatially shaped noise is then filtered by a delayand-sum beamformer. In this work, we also introduce higherorder σ-δ structures and hybrid space-time architectures that can achieve greater noise shaping in both space and time. The coarsely quantized σ-δ structure can be used to build high-resolution arrays with lower power and complexity.