Orthogonal Frequency Division Multiplexing

5G air interface is designed based on orthogonal frequency division multiplexing (OFDM). OFDM simplifies the transmitter and receiver design for broadband communication which is characterised by frequency selective channels. Furthermore, it facilitates easy time and frequency division multiplexing. The details about the modulation and demodulation is provided in upcoming sections.


Current implementation of OFDM assume that the cyclic prefix for OFDM is same for all the OFDM symbols. In 5G, the cyclic prefix size varies for different OFDM symbols.