Question: what are subcarriers in ofdm?
Answer: OFDM divides a given channel into many narrower subcarriers. The spacing is such that the subcarriers are orthogonal, so they won't interfere with one another despite the lack of guard bands between them. ... Each 20 MHz channel, whether it's 802.11a/g/n/ac, is composed of 64 subcarriers spaced 312.5 KHz apart.