OFDM Orthogonal Frequency Division Multiplexing

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OFDM is widely used in emerging technologies such as LTE, 4G, and 5G. Basically,  OFDM (orthogonal Frequency Division Multiplexing) is a modulation scheme that enables high bandwidths.

As of now, it is the most efficient modulation scheme that has been made available.

Check out the following articles:
http://rfmw.em.keysight.com/wireless/helpfiles/89600B/webhelp/subsystems/wlan-ofdm/Content/ofdm_basicprinciplesoverview.htm
http://mobiledevdesign.com/learning-resources/orthogonal-frequency-division-multiplexing-ofdm-faq-tutorial