Robert W. Chang
In order to mitigate?multipath fading?of the desired signal in metropolitan area, Orthogonal Frequency Division Multiplexing, aka OFDM, is utilized.? In 1966, Chang introduced OFDM at Bell Labs.? OFDM increased spectral efficiency, lower multipath fading, and immunity to narrow band RF interference. ??It also reduces the complexity of receiver equalizer significantly. OFDM technique has played key role in ADSL, WLAN, DVB-T, UWB, DAB, SDARS, and ISDB standards so far, and will be likely to be evolve into Filter Bank Multi Carrier, aka FBMC, or Orthogonal Time Frequency Space, aka OTFS, for 5G technology.