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Orthogonal Frequency Division Multiplexing

OFDM is a multi carrier transmission technique capable of supporting high speed services whilst still being bandwidth efficient. It achieves this by ?forcing? multiple sub-carriers together thereby reducing the bandwidth required when compared to more traditional FDM (Frequency Division Multiplexing) methods. However, to ensure these adjacent sub-carriers do not cause excessive interference, they must be ?orthogonal? or 90? to one another.

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