Title :
The effects of ADC nonlinearities on digital beamformers
Author :
Ucci, Donald R. ; Petroit, Robert G.
Author_Institution :
Dept. of Electr. & Comput. Eng., Illinois Inst. of Technol., Chicago, IL, USA
Abstract :
The output beam pattern of a digital beamformer (DBF) using the full dynamic range of a high-speed (HS) analog-to-digital converter (ADC) was investigated. A simple model for the full-range HS ADC nonlinearity was developed. It is shown that the nonlinearities in an HS ADC can cause substantial degradation in a digital beamforming array when interference is present. This degradation is caused by the appearance of `phantom´ interferers created by the nonlinearity of the ADCs. These phantom interferers are harmonics of the original interferer and signal
Keywords :
analogue-digital conversion; antenna arrays; antenna radiation patterns; interference (signal); ADC nonlinearities; digital beamformers; digital beamforming array; dynamic range; harmonics; high speed ADC; interference; output beam pattern; phantom interferers; Chromium; Delay effects; Distortion measurement; Frequency measurement; Gain measurement; Interference; Jamming; Performance gain; Phased arrays; Power measurement;
Conference_Titel :
Military Communications Conference, 1989. MILCOM '89. Conference Record. Bridging the Gap. Interoperability, Survivability, Security., 1989 IEEE
Conference_Location :
Boston, MA
DOI :
10.1109/MILCOM.1989.103939
