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2017 | OriginalPaper | Chapter

3. Bandwidth-Efficient Modulation With OFDM

Author : Wei Gao

Published in: Energy and Bandwidth-Efficient Wireless Transmission

Publisher: Springer International Publishing

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Abstract

An orthogonal frequency division multiplexing (OFDM) technique has been developed for wideband data transmission through multipath fading channels without the need for complex equalizers. The concept of OFDM dates back to the 1960s, when Chang [1] first proposed the synthesis of orthogonal signals for multichannel data transmission in 1968. Wideband transmission systems are more vulnerable to multipath fading because the fading notches have a higher chance of dropping into the transmission bandwidth. As its name implies, OFDM is a scheme of splitting a single data sequence at a high bit rate into many parallel sub-data streams at a low symbol rate to conventionally modulate orthogonal subcarriers in order to space these subcarriers close together in a certain bandwidth. OFDM has continuously developed into a very popular scheme for wideband digital communication systems, such as 802.11a/g/n/ac-based wireless local area networks (WLANs), digital television, audio broadcasting, and 4G mobile LTE communication standards.

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Title: Bandwidth-Efficient Modulation With OFDM
Author: Wei Gao
Publisher: Springer International Publishing
Book: Energy and Bandwidth-Efficient Wireless Transmission
Print ISBN: 978-3-319-44220-4

Electronic ISBN: 978-3-319-44222-8

Copyright Year: 2017
DOI: https://doi.org/10.1007/978-3-319-44222-8_3