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If it is for 700 to 720MHz with bandwidth 20MHz , so where do UE finds the DC subcarrier?

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If it is for 700 to 720MHz with bandwidth 20MHz so it finds DC subcarrier at 710Mhz?

LTE: How do the UE knows that a particular subcarrier is a DC subcarrier?

Please do clear my doubt

posted Jan 28, 2015 by Shivaraj Kenche

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1 Answer

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UE sweeps through all supported band one by one in a order. Sweeping is done in a steps of 100KHz (Channel raster for LTE)

Suppose UE supports 600 800 2100 and 2300 bands then one by one UE will scan all the Frequency in the steps of 100 KHz. PSS and SSS synchronization helps UE to know the center 1.08MHz ie in this case close to 710MHz. Now UE reads PBCH which tells the range ie 20 MHz in your case.

DC sub-carrier is in the center of 1.08MHz or 72 RBs, see the following figure -

SubFrame Structure

answer Jan 28, 2015 by Salil Agrawal
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