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Sidebar 1.1 A Brief History of OFDM
Although OFDM has become widely used only recently, the concept
dates back some 40 years. This brief history of OFDM cites some
landmark dates.
1966: Chang shows that multicarrier modulation can solve the multipath problem without reducing data rate [4]. This is generally considered the first official publication on multicarrier modulation. Some earlier work was Holsinger's 1964 MIT dissertation [5] and some of Gallager's early work on waterfilling [6].
1971: Weinstein and Ebert show that multicarrier modulation can be ac_complished using a DFT [7].
1985: Cimini at Bell Labs identifies many of the key issues in OFDM tra_nsmission and does a proof-of-concept design [8].
1993:
DSL adopts OFDM, also called discrete multitone, following succe_ssful
field trials/competitions at Bellcore versus equalizer-based systems.
1999: The IEEE 802.11 committee on wireless LANs releases the 802.11a standard for OFDM operation in 5GHz UNI band.
2002:
The IEEE 802.16 committee releases an OFDM-based standard for wireless
broadband access for metropolitan area networks under revision 802.16a.
2003: The IEEE 802.11 committee releases the 802.11g standard for operation in the 2.4GHz band.
2003: The multiband OFDM standard for ultrawideband is developed, showing OFDM's usefulness in low-SNR systems.
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