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LTE: Why we don't use SC-FDMA in downlink?

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LTE: Why we don't use SC-FDMA in downlink?
posted Sep 17, 2016 by Sneha Maganahalli

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1 Answer

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Intention of an eNodeB is to send as much as data possible in downlink. By using OFDMA technology, eNodeB can achieve this. OFDMA consumes more power compare to SC-FDMA. Since UE has limited power (battery) that's why it uses SC-FDMA technique to send data in uplink direction.
Conclusion is when eNodeB has more power and it can use OFDMA then why it would use SC-FDMA which provides less data rate.
If you check the LTE downlink and uplink data rate then you can easily make out due to SC-FDMA, uplink data rate is less.

answer Sep 17, 2016 by Harshita
How ofdma provide higher data rate than scfdma?
Similar Questions
+1 vote

I know the reason why OFMDA cannot be used for the uplink but I wonder why SC-FDMA is not used for the downlink. It is still a form of OFDMA technology.

+2 votes

SC-FDMA is kind of a variant of OFDMA so I wanted to know is it practically possible to deploy SC-FDMA for multiple access in downlink in LTE-A and what will be the negatives of deploying SC-FDMA for downlink instead of OFDMA?

+1 vote

PAPR is the major disadventage of OFDMA which require high resolution D/A and A/D or increasing Transmission Power.
I know that SC-FDMA used on Uplink becuase it has lower PAPR than OFDMA. On downlink direction, the high PAPR Problem of OFDMA solved by increasing eNB transmission power. This solution cannot be implemented on Uplink direction because UL is power limited link. so SC-FDMA used on UL instead of OFDMA, but why? why SC-FDMA has LOWER PAPR

0 votes

Please explain SC-FDMA and OFDMA in detail