11
2
orthogonal
frEquEncy Division
MultiplExing thEory
2.1 Introduction
It is clear from the previous chapter that orthogonal frequency division
multiplexing (OFDM) achieves high spectral efficiency, high data
rates, and dynamic allocation of bandwidth to users without com-
plex implementation. As a result, various current and future wireless
systems such as IEEE 802.11g, s, n (WiFi); Long-Term Evolution
(LTE); Worldwide Interoperability for Microwave Access (WiMAX);
and Digital Video Broadcast (DVB) have adopted OFDM as their
modulation technique. Among all these technologies, WiMAX is the
most popular because of its high bandwidth (i.e., >10 MHz), cover-
age, cost effectiveness, and ability to match to any network type. One
important part of the ...