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ICACT20210238 Question.2
Questioner: tetsuya-iye@kke.co.jp    2021-02-09 오후 4:14:34 		ICACT20210238 Answer.2
Answer by Auhor kawano.masahiro959@mail.kyutech.jp   2021-02-09 오후 4:14:34
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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.
ICACT20210238 Question.3
Questioner: kenta-suzuki@atr.jp    2021-02-09 오후 5:46:29 		ICACT20210238 Answer.3
Answer by Auhor kawano.masahiro959@mail.kyutech.jp   2021-02-09 오후 5:46:29
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Thank you for your interesting presentation. I'm Kenta Suzuki from ATR. I understand that the clock synchronization among devices is important for the proposed method in order to cancel the self interference. My question is following. Does the malti-path delay of the desired signal which will occur in a realistic environment affect to the canceling process? Thank you for your question. Even if the multipath delay of the target signal is large, that is, the delay profile is large, it does not affect the self-interference (SI) canceling process. In the proposed method, the transmitter is adjusted so that the null beam is directed toward the self-channel matrix from AP to AP. As a result, SI is automatically canceled when it reaches the antenna of the AP for which want to cancel SI. Therefore, when the target signal arrives, the SI has already been canceled, and the desired signal does not interfere with the SI cancellation.
ICACT20210238 Question.4
Questioner: kenta-suzuki@atr.jp    2021-02-09 오후 6:05:11 		ICACT20210238 Answer.4
Answer by Auhor kawano.masahiro959@mail.kyutech.jp   2021-02-09 오후 6:05:11
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I have another question. In this presentation, there are two APs in the experiment environment . How many APs the proposed method can process? Thank you for another question. There is no theoretical limit to the number of APs that can cooperate in the proposed method. However, in reality, we think that the number of APs will be about several due to some restrictions. Examples of constraints include the difficulty of completely synchronizing the clocks of many APs and the increased load on the backbone network. Furthermore, as the number of APs increases, the number of transmitting antennas and the number of transmitting streams increase, and the amount of calculation of the precoding matrix for applying the proposed method increases explosively, which is also considered to be a constraint.