Thank you for your presentation. I have two questions. You have mentioned a fast channel estimation is required because the channel varies rapidly. My first question is, what is the order of channel variation (fading) in magnitude (in dB, power) and also time (in seconds, or OFDM subframes, slot)? And my second question is how fast the channel should be estimated (in seconds, OFDM subframes, slots, etc.)? Do you have any recommendations about the channel estimation rate? Thank you in advance for your time.
Thank you for your question.
We assume mobility in nano-area is less than 10mm per one OFDM frame(10msec) is less than 10mm.
With the assumption above, and consider the mmWave's wave length, it is required to estimate fading channel every 10msec. Regarding blockage, the time constraints is much reluxed, such as 0.1sec or longer.
