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Unformatted text preview: than the delay spread of the wireless channel. The data rate is limited by this restriction for single-carrier Time-Division Multiple Access (TDMA) systems. In  Claude Shannon suggested that the highest data rate can be achieved for frequency selective channels by using a multicarrier system with an infinitely dense set of subcarriers and adapting transmission powers and data rates according to the signal-to-noise ration (SNR) at different subcarriers. In general, multicarrier modulation schemes divide the available bandwidth into many subcarriers and transmit multiple data streams in parallel over them. Orthogonal Frequency Division Multiplexing (OFDM) is a type of multicarrier transmission that divides the entire channel into many narrow band subcarriers. These subcarriers are transmitted in parallel...
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- Spring '09