Digital Predistortion Combined with Iterative Method for MIMO Transmitters

Round 1

Reviewer 1 Report

 

In this manuscript, an auxiliary module is proposed to mitigate the crosstalk effect in multiple input-multiple output (MIMO) transmitters and actual experimental platform is provided. This manuscript can be accepted after major modification listed as follows:

 

_ Abstract should be reported with numbers and performance improvement percentages. Provide some quantitative results with numbers in the abstract.

- In the Abstract line 13 it is mentioned that “ we need not consider other branches…”

Kindly avoid using “I” and “We” in the manuscript  and provide passive voice sentences in the manuscript.

 -In line 12 in the mentioned that compared with the “Traditional method of linearization” …. Provide structure or block diagram of the Traditional method and compared with the proposed method.

- In Fig.6 the written number 1,2,...6 are not clear at all. Add high quality photo.

- Provide separate photo (in Fig.6) for applied MIMO array.

- In the proposed actual experimental platform, which depicted in Fig 6 and Fig 7, coupler is used, add briefly explanations about applied coupler and provide sufficient explanation about coupler design in 5G, maybe below paper is helpful: Design of a miniaturized branch line microstrip coupler with a simple structure using artificial neural network. Frequenz. 2022 Jun 1;76(5-6):255-63.

-Comparison table should be added and proposed methods should be compared with other related works.

In this manuscript only ACLR is reported. Both The EVM (error vector magnitude) and ACLR should be reported.

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 2 Report

The proposed iterative process is not very well presented in the paper. In section 3B, what is the configuration for the PH and CPWL model? The memory polynomial (MP) model needs to be explicitly defined in the paper.

The quality of Figure 6 needs to be improved, the label number is not clear.

In the experimental setup, the authors only considered the crosstalk in the PAs input, while the effect of crosstalk at the output is usually stronger in the MIMO system. The scenario is too simple. Have the authors tested the method by, for example, putting the coupler on the PAs output?

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Round 2

Reviewer 1 Report

The authors have been addressed most of my concerns the paper can be accepted in this form.

Reviewer 2 Report

Thanks for addressing the comments.