Passive Location for 5G OFDM Radiation Sources Based on Virtual Synthetic Aperture
Round 1
Reviewer 1 Report
This paper presents a noval location method for OFDM source based on virtual synthetic aperture. But it has some problems need to be clarify:
(1)What if the phase between different slot duration is not coherent? Is the equation (2) need to consider it?
(2)In the simulation of section 4, if the parameters in table 2 is not exact known but has some small error? Please consider the effect of these errors.
Author Response
Dear Reviewer,
Thank you for your valuable comments, which are very helpful for our work. We have carefully studied and made revisions. The details are in the attached PDF.
Kind Regards.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
1. Since this paper is concerning on source localization, more recent works concerning localization should be introduced in the Introduction section. Maybe the following references are helpful: A). Traffic target location estimation based on tensor decomposition in intelligent transportation system, IEEE TITS; B). 3D positioning method for anonymous UAV based on bistatic polarized MIMO radar, IEEE IOT;
2. What does t in (1) mean? Besides, the defination of rect{} is inconsist with the format in (2). All the symbols in the equations should be double-checked and make sure that they have given full explanations;
3. 'The principle of the algorithm' should be 'The principle of the proposed localization algorithm';
4. The format of the text in Fig3 and Fig4 are different. Please check;
5. More details on (25) should be given;
6. Theoretical analyses of various methods should be highlighted in a new subsection;
Author Response
Dear Reviewer,
Thank you for your valuable comments, which are very helpful for our work. We have carefully studied and made revisions. The details are in the attached PDF.
Kind Regards.
Author Response File: Author Response.pdf
Reviewer 3 Report
1. The range resolution presented in the paper is very bad for OFDM signal. In the simulations, the range resolution of 50MHz bandwidth signal is only 16.79km. Obviously the author should improve their method to achieve a higher range resolution which should be inversely proportional to signal bandwidth.
2. Please check the attached PDF file for some typos and remarks.
Comments for author File: Comments.pdf
Author Response
Dear Reviewer,
Thank you for your valuable comments, which are very helpful for our work. We have carefully studied and made revisions. The details are in the attached PDF.
Kind Regards.
Author Response File: Author Response.pdf
Reviewer 4 Report
1) Please collect all the acronyms employed throughout the manuscript in a given table for readers’ convenience.
2) The related work discussion should be complemented with a table categorizing the closely-related works along their main distinctive axes so as to better categorize the proposed contribution.
3) Please add a paper notation paragraph at the end of Sec. I.
4) Please discuss the computational complexity involved in the proposed approach.
5) At the end of conclusion section, please enrich more the paragraph on future research directions. One interesting option may be trying to provide a theoretical performance analysis for the proposed localization approach, following e.g.
"Performance analysis of the total least squares ESPRIT algorithm." IEEE transactions on signal processing 39.5 (1991): 1122-1135.
"Performance analysis of time-reversal MUSIC." IEEE Transactions on Signal Processing 63.10 (2015): 2650-2662.
Author Response
Dear Reviewer,
Thank you for your valuable comments, which are very helpful for our work. We have carefully studied and made revisions. The details are in the attached PDF.
Kind Regards.
Author Response File: Author Response.pdf
Round 2
Reviewer 2 Report
No
Author Response
Dear Reviewer,
Thank you for your comments and suggestions in our paper revision,
and we are very happy to get your approval.
Kind regards.
Reviewer 3 Report
No more comments.I still suggest the author should improve their method to achieve a higher range resolution.
Author Response
Dear Reviewer,
Thank you for your comments and suggestions in our paper revision.
This algorithm has poor range resolution at the high center frequency, which is determined by the nature of the algorithm. I'm sorry that it cannot be modified to your satisfaction in a short time. To further improve the range resolution, a new improved algorithm needs to be proposed, and we will further improve the algorithm performance including range resolution in the follow-up study.
Thank you again for your valuable advice which is of great significance to our follow-up research.
Kind regards.
Reviewer 4 Report
Please mention the suggested references as sound examples in performing theoretical analysis of localization performance, e.g.
"Performance analysis of the total least squares ESPRIT algorithm." IEEE transactions on signal
processing 39.5 (1991): 1122-1135.
"Performance analysis of time-reversal MUSIC." IEEE Transactions on Signal Processing 63.10 (2015):
2650-2662.
Author Response
Dear Reviewer,
Thank you for your comments and suggestions in our paper revision.
We have added reference citations in Chapter 2, which gives the theoretical analyses of typical source localization methods and added references [24]-[27] as support.
The revision has been highlighted in yellow in Chapter 2 of the paper.
Thank you again for your suggestion and we hope to meet with approval.
Kind regards.
