This paper focuses on channel estimation in single-user and multi-user MIMO systems with multi-antenna base stations equipped 1-bit spatial sigma-delta analog-to-digital converters (ADCs). A careful selection of the quantization voltage level phase shift used feedback loop ADCs is critical to improve its effective resolution. We first develop a noise model for ADCs. Using developed model, we th...

The article considers the issue of increasing spatial resolution during registration digital holograms. In practice, discretization is carried out by measuring signal samples using sensors with a certain finite aperture. determined size aperture area over which averaging takes place. enhancement method based on sampling equation for signals obtained subpixel shift generalized functions. A value...