Abstract
A novel delta–sigma (\(\varDelta \)–\(\varSigma \)) modulation method is proposed for extending noise-shaping to three dimensions: 2-D space and time. We show that a spatially-oversampled \(N_{x}\times N_{y}\) antenna array coupled to a noise-shaped low-noise amplifier and analog-to-digital converter can diminish in-band additive noise and distortion by shaping the multi-dimensional spectrum towards higher spatial frequencies that are outside the space–time regions of support of all possible propagating electromagnetic waves. Detailed circuit simulations in a 65 nm CMOS process with wideband RF inputs at a center frequency of 4 GHz confirm that the proposed 3-D noise-shaping approach provides significant improvements in noise figure and resolution for 2-D array receivers.
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This project is sponsored by the National Science Foundation under Grants ECCS-1730946 and ECCS-1731722.
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Wang, Y., Liang, J., Belostotski, L. et al. \(\varvec{\varDelta }\)–\(\varvec{\varSigma }\) noise-shaping in 3-D space–time for 2-D wideband antenna array receivers. Multidim Syst Sign Process 30, 1609–1631 (2019). https://doi.org/10.1007/s11045-018-0620-2
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DOI: https://doi.org/10.1007/s11045-018-0620-2