[Reference: https://www.cnrood.com/en/media/solutions/Wi-Fi_Overview_of_the_802.11_Physical_Layer.pdf, According to the 802.11 standard, OFDM channels in the 2.4 GHz band are 20 MHz wide., , According to the Lecture 3 - Radio Frequency and Antenna Fundamentals - Part 2 document2, OFDM channels in the 2.4 GHz band are 20 MHz wide according to the 802.11 standard., References: http://faculty.georgebrown.ca/~jolenewa/courses/comp3049-intermediate-wirel/lecture-3—radio-frequency.pdf, , , ]