From the course: Telecom Network Evolution: 2G-to-6G Technologies, Architecture, and Key Concepts

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Orthogonal frequency division multiple access

Orthogonal frequency division multiple access

From the course: Telecom Network Evolution: 2G-to-6G Technologies, Architecture, and Key Concepts

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Orthogonal frequency division multiple access

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(soft pulsing music) - [Instructor] Imagine you are at a party and everyone is talking to one another at the same time. Usually you would ask people to give each other some space so that their voices don't overlap, right? And that space is like the guard bands in traditional systems, which waste precious airtime and spectrum. But what if instead everyone spoke in a way that their voices perfectly lined up? There is no overlapping, no interference, even when they are close together. That's what the OFDMA, Orthogonal Frequency-Division Multiple Access does in 5G. Now we have a term which is OFDM, which is Orthogonal Frequency-Division Multiplexing, which says that when sending data over multiple carriers in frequency domain, typically you would leave some spaces, normally called as guard bands between subcarriers to avoid interface. But these guard bands waste some precious spectrum, which is one of the most expensive resources for telcos. So OFDM, what it does is it solves this by…

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