[Discuss-gnuradio] OFDM block in GRC

i'm working on wlan system wich is 802.11a/g it use OFDM mod . in GRC i found a ofdm mod block wich contains mod type ,ifft , cyclic prefix but i think it doesn't support the number of subcarrier pilots and there position wich are 4 pilots . so i ask if smeone can explain to me if there is any solution to fix this

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