Δ – Σ noise-shaping in 3-D space–time for 2-D wideband antenna array receivers
Article
Wang, Y, Liang, J, Belostotski, L et al. (2019). Δ – Σ noise-shaping in 3-D space–time for 2-D wideband antenna array receivers
. MULTIDIMENSIONAL SYSTEMS AND SIGNAL PROCESSING, 30(3), 1609-1631. 10.1007/s11045-018-0620-2
Wang, Y, Liang, J, Belostotski, L et al. (2019). Δ – Σ noise-shaping in 3-D space–time for 2-D wideband antenna array receivers
. MULTIDIMENSIONAL SYSTEMS AND SIGNAL PROCESSING, 30(3), 1609-1631. 10.1007/s11045-018-0620-2
A novel delta–sigma (Δ–Σ) modulation method is proposed for extending noise-shaping to three dimensions: 2-D space and time. We show that a spatially-oversampled Nx× Ny 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.
