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Modulation Scheme used in downlink channel in LTE?

+1 vote
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What are the modulation schemes used for the Downlink Channel in LTE?

posted Jul 9, 2013 by anonymous

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2 Answers

+5 votes
 
Best answer

There are 3 modulation schemes are used in lte .
1. QPK
2. 16 QAM
3. 64 QAM

Based on the Channel Quality Indicaiton reported by UEs to eNB. Enodeb MAC scheduler chooses appropriate modulation scheme to send data. As usual if radio conditions are good scheduler would like to send more data(more bits over the one resource element) so it will use 64 QAM. Similarly for other two. I am just telling about PDSCH which is mainly used for data so modulation schemes varies. But some channels like PDCCH and PBCH are in LTE system which mainly focus on reliable delivery of control data UE/UEs,so QPSK is used to send control information.

answer Jul 9, 2013 by Vimal Kumar Mishra
For Data Transmission : QPSK, 16QAM, 64QAM for PDSCH, PMCH
For Normal Control Information : QPSK for PDCCH, PCFICH, PBCH
For HARQ : BPSK for PHICH
+1 vote

Modulation scheme used in DL are QPSK, 16QAM And 64 QAM. Depending on the radio condition as main criteria it is decided.

answer Jul 15, 2013 by anonymous
Similar Questions
+2 votes

Hi all

Downlink TFTs is used just for P-GW to decide which bearer that packet should go.
It is not useful for UE (or i miss something?)

Therefore, why PGW sends Downlink TFTs to UE?

thanks

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Find the answer. The answer is include in comment.

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+1 vote

why QPSK modulation scheme is used for all control channels in LTE ?

+2 votes

I'm a little confused about the description of RNTI values used for scrambling DL-SCH data in Section 7.1 of 36.213. My questions are the following,

a) From the Transmitter(eNB) perspective, how do we pick the right RNTI value for scrambling DL-SCH data as part of the PDSCH processing ?. To elaborate, Is the choice between C-RNTI, SI-RNTI, P-RNTI for c_init made based on Transmission Scheme ? How ?

b) What is the range ( in decimal values) corresponding to each of the above mentioned RNTI choices ?

+7 votes

I have search through the android official (http://developer.android.com/sdk/index.html) website but I cloud not find the proper link to install android SDK.


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