Abstract:
A multi-dimensional noise-shaping method based
on delta-sigma modulation has been proposed. This method
extends delta-sigma modulation into the two-dimensional (2-D)
case (space, time). The proposed noise-shaping method employs
lossless discrete integrators for realization in microwave and mmwave
array processing systems. The paper shows that 2-D noiseshaping
reduces the spectral overlap of a desired array signal
with that of noise. By reducing the overlap of the ROSs, 2-
D filtering can be used to improve the overall noise figure of
the array receiver. A noise figure improvement of 2.6 dB could
be simulated for a 4-times spatially over-sampled array with 65
simulated elements for an input signal to noise ratio of 10 dB and
LNA noise figure of 5 dB. Simulation results based on wideband
signals on 33, 65, 129 and 257 element antenna arrays with
2, 4 and 8 times oversampling show the potential capability of
the proposed system in improving overall noise figure. Although
mathematical modeling shows potential improvements in receiver
noise figure, RF integrated circuit realizations are challenging
and have not been attempted yet.
Citation:
S. Handagala, A. Madanayake, L. Belostotski and L. T. Bruton, "Delta-sigma noise shaping in 2D spacetime for uniform linear aperture array receivers," 2016 Moratuwa Engineering Research Conference (MERCon), 2016, pp. 114-119, doi: 10.1109/MERCon.2016.7480125.