Suboptimal Techniques for Spatial Processing of the Partially Coherent Signals in Multimode Waveguides.

Saved in:

Bibliographic Details
Title:	Suboptimal Techniques for Spatial Processing of the Partially Coherent Signals in Multimode Waveguides.
Authors:	Malekhanov, A. I.¹ (AUTHOR) almal@ipfran.ru, Smirnov, A. V.¹ (AUTHOR)
Source:	Radiophysics & Quantum Electronics. Mar2025, Vol. 67 Issue 10, p766-787. 22p.
Subjects:	Multimode waveguides, Antenna arrays, Spatial analysis (Statistics), Signal processing, Signal-to-noise ratio, Waveguides, Numerical calculations
Abstract:	We perform a comparative study of the techniques for spatial processing of partially coherent signals with discrete spatial spectrum, which are received by a large antenna array in a randomly inhomogeneous multimode waveguide. The array gain in conventional terms of the signal-tonoise-plus-interference ratio is used as a criterion of the processing effectiveness. Our main attention has been paid to consideration of heuristically motivated suboptimal array processors, which, unlike the optimal processors, do not require complete information about the coherence functions (matrices) the useful signal and the interference at the array input. The key issue here is to estimate the range of the problem parameters where suboptimal processors turn out to be the most effective with an appropriate choice of their implementation parameters. Numerical calculations are carried out on the basis of a previously developed physical model of the partially coherent multimode signals, which corresponds to their formation at the input of a horizontal acoustic array arranged in a shallow-water acoustic channel (for a channel from typical of the Barents Sea in the summer season). It is shown that in the most complicated scenario where a relatively weak and coherence-degraded multimode signal is received against the background of intense multimode interference under conditions of a significant overlapping of their spatial (modal) spectra, the array gain for the proposed suboptimal techniques can reach values close to the maximum possible ones and significantly exceed the gain level determined by the total number of receiving-array elements. [ABSTRACT FROM AUTHOR]
	Copyright of Radiophysics & Quantum Electronics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database:	Engineering Source

Description
Abstract:	We perform a comparative study of the techniques for spatial processing of partially coherent signals with discrete spatial spectrum, which are received by a large antenna array in a randomly inhomogeneous multimode waveguide. The array gain in conventional terms of the signal-tonoise-plus-interference ratio is used as a criterion of the processing effectiveness. Our main attention has been paid to consideration of heuristically motivated suboptimal array processors, which, unlike the optimal processors, do not require complete information about the coherence functions (matrices) the useful signal and the interference at the array input. The key issue here is to estimate the range of the problem parameters where suboptimal processors turn out to be the most effective with an appropriate choice of their implementation parameters. Numerical calculations are carried out on the basis of a previously developed physical model of the partially coherent multimode signals, which corresponds to their formation at the input of a horizontal acoustic array arranged in a shallow-water acoustic channel (for a channel from typical of the Barents Sea in the summer season). It is shown that in the most complicated scenario where a relatively weak and coherence-degraded multimode signal is received against the background of intense multimode interference under conditions of a significant overlapping of their spatial (modal) spectra, the array gain for the proposed suboptimal techniques can reach values close to the maximum possible ones and significantly exceed the gain level determined by the total number of receiving-array elements. [ABSTRACT FROM AUTHOR]
ISSN:	00338443
DOI:	10.1007/s11141-025-10417-z