kumoh national institute of technology
Networked Systems Lab.

V. S. Doan and D. S. Kim, "DOA Estimation of Multiple Non-coherent and coherent Signals Using Element Transposition of Covariance Matrix", ICT Express, vol. 6, no. 2, pp. 67-75, June 2020. DOI : doi.org/10.1016/j.icte.2020.03.008
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Date : 2019-11-11
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Up to date, investigation of direction of arrival (DOA) gains more effort on multiple signals rather than coherent signals, particularly coherent signals measured by non-uniform and circular arrays — which still remains room for exploration. In this study, a new approach using element transposition of the covariance matrix combined with the MUSIC algorithm was proposed to estimate DOAs of multiple coherent and non-coherent signals by an arbitrary symmetric antenna array. A balanced property of phase differences of the symmetric antenna array was discovered to de-correlate the received signals, and simulation was performed for linear and circular arrays. Here, we established a new method to estimate and distinguish the DOAs of both non-coherent and coherent signals with higher accuracy and resolution than other conventional methods.

Final review comments,
Reviewer #1:
-The authors propose a new approach using element transposition of the covariance
matrix combined with the MUSIC algorithm was proposed to estimate DOAs of
multiple coherent and non-coherent signals by an arbitrary symmetrical antenna array.
The manuscript is well-written and well-organized. The proposed technique sounds
reasonable and the key idea seems to be interesting. The authors verified the superiority
of their proposed scheme with extensive simulations. The reviewer recommends the
manuscript to be accepted for publication in ICT express after careful proofreading.
Response: We thank the reviewer for the valuable recommendation. All typos and
grammar errors in the manuscript were carefully corrected.

Reviewer #2:
- his paper proposes an element transposition of covariance matrix to estimate DOA of
coherent signals. Overall, the problem to solve is clearly written and the results seem
technically sound. However, this paper presents just simple and naive idea and shows
its gain via a simulation without any detailed analysis, which considerably limits the
contribution. Therefore, I think that the contribution of this paper is not deep enough
for a journal paper, so I cannot recommend this paper for publication at ICT Express.