[[https://www.youtube.com/watch?v=rKy5dOl3Et4|
 2.3 - OFDM/ OFDMA IN 4G LTE - PART 1 ]]

[[https://www.youtube.com/watch?v=MBcGO3EC3Qs|
 2.4 - OFDMA/SC-FDMA IN 4G LTE - PART 2 ]]