Abstract
The technique used for radio transmission and reception in long‐term evolution (LTE) is known as orthogonal frequency division multiple access (OFDMA). OFDMA carries out the same functions as any other multiple access technique, by allowing the base station to communicate with several different mobiles at the same time. This chapter describes the basic principles of OFDMA and shows the benefits that arise when it is used in a mobile cellular network. It covers a modified radio transmission technique, known as single carrier frequency division multiple access (SC‐FDMA), which is used for the LTE uplink. OFDMA is also used by several other radio communication systems, such as wireless local area networks and WiMAX (IEEE 802.16), as well as in digital television and radio broadcasting. However, LTE is the first system to have made use of SC‐FDMA. LTE uses a slightly more complex technique known as cyclic prefix insertion .
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