A Sparse Design for Aperture-Level Simultaneous Transmit and Receive Arrays

The aperture-level simultaneous transmit and receive (ALSTAR) system uses full digital architecture with an observation channel to achieve remarkably effective isotropic isolation (EII). However, the number of observation channels must be the same as the number of transmit channels, which increases...

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Bibliographic Details
Published in:Electronics (Basel) 2022-10, Vol.11 (20), p.3381
Main Authors: Hu, Dujuan, Wei, Xizhang, Xie, Mingcong, Tang, Yanqun
Format: Article
Language:English
Subjects:
Algorithms
Antenna arrays
Antennas
Apertures
Arrays
Beamforming
Channels
Convex analysis
Design and construction
Genetic algorithms
Mathematical optimization
Methods
Optimization
Radiation
Receivers & amplifiers
Signal processing
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Summary:The aperture-level simultaneous transmit and receive (ALSTAR) system uses full digital architecture with an observation channel to achieve remarkably effective isotropic isolation (EII). However, the number of observation channels must be the same as the number of transmit channels, which increases the system’s complexity. To balance the system cost and performance of the ALSTAR, this paper proposes a joint design of sparse arrays and beamforming, which are achieved by a genetic algorithm and an alternating optimization algorithm, respectively. In the sparse design, we introduce beamforming technology to guarantee the EII while decreasing the corresponding elements of observation channel that contribute slightly to the EII. The simulation results are presented for a 32-element array that achieves 185.87 dB of the EII with 1000 W of transmit power. In the cases of sparsity rates at 0.875 and 0.75 (≥0.6), i.e., the number of observation channels decreases by 12.5% (2/16) and 25% (4/16), the reductions in EII do not exceed 1 dB and 3 dB, respectively. However, the EII decreases rapidly with a sparsity rate less than 0.25. Results demonstrate that our proposed joint design of sparse arrays and beamforming can reduce the system cost with little performance loss of EII.
ISSN:2079-9292
2079-9292
DOI:10.3390/electronics11203381