Chapter 4. OFDM Transmission

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 [116] and the DVB broadcast technologies [17].

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 3.5 in the previous chapter, are:

  • The use of a relatively large number of narrowband subcarriers. In contrast, ...

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