Optimum signal processing for adaptive arrays with broadband signals and interferers
Abstract
The customary technique used to combine the output signals in an adaptive array is to use frequency-independent complex weighting and summing. This technique suffers degraded performance in the presence of broadband signals and multiple broadband interferers. In this paper, the optimum frequency-dependent weighting network for adaptive arrays is derived. Expressions are obtained for the optimum transfer function and the resulting signal-to-noise (SNR) ratio. These SNR expressions are performance bounds for any frequency-independent weighting network. A practical realization of a broadband combining network which approximates this optimum is also described. Examples are given which compare the performance of this suboptimum combining technique with classical I/Q processing and the optimum structure.
- Publication:
-
NTC 1981; National Telecommunications Conference, Volume 2
- Pub Date:
- 1981
- Bibcode:
- 1981ntc.....2....7P
- Keywords:
-
- Adaptive Control;
- Antenna Arrays;
- Signal Processing;
- Broadband;
- Linear Arrays;
- Signal To Noise Ratios;
- Communications and Radar