OFDM – 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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