OFDM transmission
Erik Dahlman, Stefan Parkvall, Johan Skold and Per Beming
In this chapter, a more detailed overview of OFDM or Orthogonal Frequency Division Multiplexing will be given. OFDM has been adopted as the downlink transmission scheme for the 3GPP Long-Term Evolution (LTE) and is also used for several other radio technologies, e.g. WiMAX and the DVB broadcast technologies.
4.4.1 Basic principles of OFDM
Transmission by means of OFDM can be seen as a kind of multi-carrier transmission. The basic characteristics of OFDM transmission, which distinguish it from a straightforward multi-carrier extension of a more narrowband transmission scheme as outlined in Figure 4.3-5 in the previous chapter, are:
• The use of a relatively ...
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