Design of a Short Reference Differential Chaotic Shift Keying Communication System Based on Reference Signal Scrambling Transformation

Round 1

Reviewer 1 Report

Firstly, I congratulate the authors for their work, even though it is tremendously specialized, their proposal is interesting in several ways, highlighting among them that they were rigorous in their mathematical treatment and simulations. They must improve their English, for them I recommend that they seek advice from a professional who can give them the key terms and can make the article more fluid. Another aspect is that the font sizes for the equations do not change.

It is not very fluid to follow in general, it is recommended that someone specialized in English grammar review it to change terms in general that make it difficult to follow.

Author Response

We would like to thank Reviewer for carefully reading our paper and for the valuable comments for improving our paper. We have revised the paper with this reviewer's comments by using bold and colored text "in red". We have fixed certain grammatical errors accordingly, and also adjusted the font size of the formulas accordingly. The responses to the reviewer’s comments are listed as follows and we have improved the paper accordingly.

Point 1: Firstly, I congratulate the authors for their work, even though it is tremendously specialized, their proposal is interesting in several ways, highlighting among them that they were rigorous in their mathematical treatment and simulations. They must improve their English, for them I recommend that they seek advice from a professional who can give them the key terms and can make the article more fluid. Another aspect is that the font sizes for the equations do not change.

Response 1: We realized that we had used the wrong mathematical formula editor, and we have since edited the paper to make the formula size consistent throughout the text; in addition, we have re-examined the English expression throughout the text and revised it accordingly.

Author Response File: Author Response.pdf

Reviewer 2 Report

Authors have to compare the work in ref[8] with their presented work 

Sui, T.; Feng, Y.; Qian, B.; Liu, F.; Jiang, Q.; Li, X. Design and Analysis of a Multi−Carrier Orthogonal Double Bit Rate Differential 430 Chaotic Shift Keying Communication System. Electronics 2023, 12, 1785.

Also, no comparison with other references has been presented and analyzed

The computation complexity must be declared and justified

No flow chart/pesoducode  has been presented 

Also, the editing technique, font for the equations is so bad !!!!!!!!!!!!!!!!

There may be improved specific concern to be given to  conclusion and result analysis  subscetions 

Author Response

We would like to thank Reviewer for carefully reading our paper and for the valuable comments for improving our paper. We have revised the paper with this reviewer's comments by using bold and colored text "in red". We have fixed certain grammatical errors accordingly, and also adjusted the font size of the formulas accordingly. The responses to the reviewer’s comments are listed as follows and we have improved the paper accordingly.

Point 1: Authors have to compare the work in ref [8] with their presented work.

Response 1: We have modified the comparison with reference [8] and additionally we have included a comparison with reference [14] to clarify the communication system comparison. The relevant changes to this issue can be seen on page 16, Figure 14, and lines 430-439 of the revised manuscript.

Point 2: Also, no comparison with other references has been presented and analyzed

Response 2: We re-compare this with references [5] and [10]. The relevant changes to this issue can be seen on page 15, Figure 13, and lines 413-416 of the revised manuscript.

Point 3: The computation complexity must be declared and justified

Response 3: To address this issue, we cite the mathematical methods in the corresponding references and explain the mathematical methods The relevant revisions of this problem can be seen on page 8, line 255-257 and page 11, line 328-329 of the revised manuscript.

Point 4: No flow chart/pesoducode has been presented 

Response 4: We have included a signaling flowchart for the RSST-SR-DCSK system. The relevant revisions of this problem can be seen on page 9, figure 7 of the revised manuscript.

Point 5: Also, the editing technique, font for the equations is so bad !!!!!!!!!!!!!!!!

Response 5: We apologize for this phenomenon, and we have re-adjusted all editing techniques as well as formulas throughout the article accordingly.

Author Response File: Author Response.pdf

Reviewer 3 Report

The paper propose information-bit-driven scramblers at the transmission side to eliminate the  correlation between the reference signal and information signal. At the receiving side, a descrambler is used to restore correlation, thereby enhancing information transmission security.

The transmitter and the receiver block schematic are derived and theoretical analysis and simulations are conducted to demonstrate the system performances.  

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How the descrambler works? Is the descrambling sequence known at the receiver side? How this affect the security of the transmission?

Eq. (9)  -  correct the spelling for inter-user interference

Line 297-298: B, C, D … and G, H, … there is a “,” comma?

Eq. (26) second term:  is a B’ ?

Author Response

We would like to thank Reviewer for carefully reading our paper and for the valuable comments for improving our paper. We have revised the paper with this reviewer's comments by using bold and colored text "in red". We have fixed certain grammatical errors accordingly, and also adjusted the font size of the formulas accordingly. The responses to the reviewer’s comments are listed as follows and we have improved the paper accordingly.

Point 1: How the descrambler works?

Response 1: We re-describe the workings of the scrambler and descrambler in detail. The relevant revisions of this problem can be seen on page 5-6,line 175-196,and page7,line 235-247 of the revised manuscript.

Point 2: Is the descrambling sequence known at the receiver side?

Response 2: The receiver does not need to know the descrambler sequence. However, the receiver must preset in advance how the descrambler works. The descrambler sequence decodes the original code elements based on the degree of correlation between the reference and information signals. The relevant revisions of this problem can be seen on page 8,line 263-273, of the revised manuscript.

Point 3: How this affect the security of the transmission?

Response 3: For the problem of transmission security: this system improves the security of information transmission because the non-cooperating parties do not know how the descrambler works, so that the observed time series signals are not correlated, and the recovery of information bits is necessary to know the rules of descrambling. The relevant revisions of this problem can be seen on page 7,line 224-231of the revised manuscript.

Point 4: Eq. (9)-correct the spelling for inter-user interference

Response 4: We've made changes. The relevant revisions of this problem can be seen on page 8,Eq.(9) of the revised manuscript.

Point 5: Line 297-298: B, C, D … and G, H, … there is a “,” comma?

Response 5: Yes. The relevant revisions of this problem can be seen on page 12, line 345-347 of the revised manuscript.

Point 6: Eq. (26) second term : is a ’B’ ?

Response 6: It's ‘B’. The relevant revisions of this problem can be seen on page 9, Eq.(26) of the revised manuscript.

Author Response File: Author Response.pdf