From the course: 5G Architecture, Design, Protocols, Evolution, and Deployment

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Modulation and coding schemes

Modulation and coding schemes

From the course: 5G Architecture, Design, Protocols, Evolution, and Deployment

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Modulation and coding schemes

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(light music) - [Instructor] So we talked about the modulation where we have to modulation schemes such as QPSK, 16QAM, 64QAM and 256QAM. So the higher the modulation order is the more bits we can pack into each symbol. And hence, there is a faster data rate. But here's the catch, we cannot always use the highest modulation. Now to decide which modulation to use, the network relies on channel quality indicator which is CQI, so the UE in this case constantly monitors the quality of the signal it receives then sends a CQI value back to the gNodeB. If the channel quality is great, the network may use 256QAM in that case, but if the quality's poor, it may drop down to QPSK. Now modulation is just one part. We also need to protect the data from errors during transmission. That's where coding comes in. Every message we send isn't just raw data, it is encoded with additional bits to detect and correct the errors. So in that case, we have another term which is a code rate which is used and is…

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