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For eg. Using a length of 8 pilot samples can we detect a channel of 20 taps? If your OFDM system is sensibly designed, then, no, you need a pilot on every subcarrier. They don't necessarily have to be sent in the same OFDM symbol. "Sensible" OFDM design means that you choose your subcarrier spacing no smaller than you have to. The reason that you're doing ...

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