1 Comparison of FDMA and OFDM signals; (a) five FDMA channels with guard band and (b) 5 OFDM orthogonal channels. Orthogonal frequency division multiplexing (OFDM) is a communication technique that can be seen as either a modulation scheme or a multiplexing technique .
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Orthogonal frequency-division multiplexing is a method of data transmission where a single information stream is split among several closely spaced narrowband subchannel frequencies instead of a single Wideband channel frequency .
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