What is the channel impulse response? In the channel estimation of OFDM.

The channel impulse response is h in y = x * h

Send x= 1, receive y=h, and the received value can be used as the value of channel estimation. Of course, the premise is that you need to know that the sender is 1, and this 1 is pilot. This is the simplest channel estimation based on pilot. Is that clear enough?

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