Radar Waveform Optimization for Joint Radar Communications Performance

Round 1

Reviewer 1 Report

The paper addresses a problem of topical importance, i.e. joint radar-communications (JRC). Specifically, it presents a method for waveform design that satisfies joint metrics of estimation rate and communications rates. Constraints such as side lobe ratios and spectral leakage are imposed on the optimization problem. The paper is well-written. However, I have a few concerns that I would like the authors to address:

Nearly 10 out of 15 pages (references excluded) review existing concepts and try to set the problem up. The actual new research is limited to only solving the problem in eq. (11). Then, only one method has been used to solve this problem. The whole paper has very limited new content compared to previous works by the same authors.  The comparison with some state-of-the-art is also very minimal. In the numerical experiments, most of the comparisons are with respect to a "standard chirp". However, there is plenty of existing state-of-the-art on coexisting radar mask shaping and waveform design (e.g. paper from Hugh Griffiths group in IET RSN cognitive radar special issue), joint radar-communications (see 2019 TAES paper from Bjorn Ottersten's group which discusses two JRC waveforms), etc. In fact, the literature review is very limited in the Intro. A number of above-mentioned relevant, recent works are neither compared or reviewed in this paper at all. The paper uses pharses such as "References [3,5–7] presented ...", "In Reference [8], ... ", "presented in References [6,10,12]", etc. The term Reference is unnecessary in these cases and should be dropped. How does using the estimation rate for the radar problem connected with its detection performance? The paper does not explicitly show a case where the target parameters (range, Doppler, angle) are extracted using the new waveform and their estimation errors are lower. Similarly, BER for a standard comm system is not compared as in other studies (see many works by Shannon Blunt and the recent paper by A. Ayyar in RadarConf 2019). In the paper communications data rate has been compared with the estimation rate. Please also include curves of BER, Pd and parameter RMSEs.

Overall, the paper has potential and makes a good contribution. But, the novelty is incremental compared to earlier, similar works by the same authors. The performance evaluation and literature review are non-comprehensive.

 

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 2 Report

Authors presented the continuous WF spectral-mask shaping radar waveform design technique which maximizes the performance of a cooperative spectrum sharing radar-communications system, which is basically an extension to a spectral-mask shaping waveform design method.

The proposed technique claim novelty by utilizing the continuous spectral WF algorithm in the previous work. constraints regarding the spectral leakage and radar autocorrelation peak side-lobe to main-lobe ratio are discussed. The proposed waveform design problem and the waveform design method is also made further computationally efficient.

Simulations are provided in this regard and performance comparisons are discussed in detail.

The proposed manuscript is a good addition in scientific literature and worthy to publish in its current form.



 

Author Response

We appreciate the reviewer's comments/feedback and would like to thank you for your time and effort in reviewing our paper.

Round 2

Reviewer 1 Report

This is the first revision of this manuscript. The authors have addressed most of my comments. However, a comparison of the proposed method with some other methods must be carried out before the manuscript is accepted for publication. Otherwise, it is not clear how does this method improves upon the existing state-of-the-art. 

Author Response

Please see the attachment

Author Response File: Author Response.pdf