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1st and 3rd from last OFDM symbol in each slot, 6 subcarrier difference between them in the symbol : These pilot subcarriers are used for channel estimation by UE : DM-RS : Used in the Uplink : fourth SC-FDMA symbol of the slot : Channel estimation : SRS : Used in the uplink: Zadoff Chu : transmitted on last SC-FDMA symbol of each subframe or . semibola77 slot . soda slot 888