- TITLE:
-
Spatio-Temporal Delta-Sigma Modulation
for Shared Wideband Transmit Arrays
- AUTHORS:
- Dan P. Scholnik and Jeffrey O. Coleman, Donald Bowling, and Michael Neel
- ABSTRACT:
-
Future array-based RF systems will require linear
amplification to preserve the spectral integrity of
simultaneously transmitted signals. Classical
delta-sigma modulation, paired with an emerging class
of high-power switches, can provide this linearity by
using a high-speed, low-resolution quantizer and
shaping the resulting quantization errors out of the
signal band. The drawback is that high clock rates
are required to achieve high SNR. Recently we have
proposed jointly shaping quantization errors in
temporal and spatial frequency, pushing quantization
errors both out of band and to non-propagating spatial
frequencies. This provides greater SNR for a given
clock rate or the same SNR at a reduced clock rate
relative to conventional delta-sigma modulation, while
retaining its characteristic high linearity. In this
paper we present an overview of the spatiotemporal
delta-sigma array architecture and present the results
of some preliminary hardware experiments with a small
linear array.
- DOWNLOADABLE PREPRINT:
-
PDF (876005 bytes),
- STATUS:
- Presented to the 2004 IEEE Radar Conference (RADAR 2004), Philadelphia
PA, USA, April 26-29, 2004,
- DATE OF ENTRY:
-
June 2004.