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Virual Oral Question and Answer


IEEE/ICACT20210238 Question.2 Questioner: tetsuya-iye@kke.co.jp 2021-02-09 오후 4:14:34	IEEE/ICACT20210238 Answer.2 Answer by Auhor kawano.masahiro959@mail.kyutech.jp 2021-02-09 오후 4:14:34
Thank you for your interesting presentation. Since the risk of overwritten unintentionally by another questioner is high in Q&A Number 1, I ask a question here in Q&A Number 2, although my question may be the first one. The experiment was performed in the carrier frequency of 5.64 GHz, as shown in your slide No.13. What do you think will be a new challenge in cooperative MIMO for full-duplex communication if the frequency goes higher, for example, in the millimeter-wave band?	Thank you for your questions. We think that the problem when performing cooperative MIMO communication for full-duplex wireless communication at high frequencies such as millimeter waves is that the required accuracy of clock synchronization between multiple APs required for cooperative MIMO becomes high. For example, when communicating with millimeter waves with a carrier frequency of 30 [GHz], need accuracy is simply 6 times higher than when communication is performed at 5 [GHz]. Therefore, We think that it is necessary to use a clock with higher accuracy than when using microwaves, and to introduce a compensation mechanism that realizes clock synchronization between APs with high accuracy.

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