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LTE actual(?) signal?

2014-03-11
2014-03-17
  • Claudio de Castro Coutinho Filho

    Hello, friends! At first I'd like to thank all the involved in this project's development for their work.

    I'd like to ask if it's possible to generate a .bin file with an actual information-carrying signal. As I noticed from the Octave code, the Resource Elements (RE) are not being used when the .bin file is generated.

    As you can see in the plots below (Slot 0 and Slot 1), at the receiver, some symbols seem not to transmit any data at all. They seem to keep only the PBCH info etc.

    Slot 0

    Slot 1

    Am I making any mistake, or is that a way to carry actual information?

    (I plan to use this as part of my Masters thesis)

    Thanks in advance!

     
    • bwojtowi

      bwojtowi - 2014-03-17

      When a downlink LTE signal is constructed, any unused subcarriers transmit
      0's. This is what you have observed above and is what actual eNodeBs
      transmit over the air. There is a parameter called percent_load in
      LTE_fdd_dl_file_gen to produce up to 66% of dummy load. This will fill up
      to 66% of the unused subcarriers with random values.

      Hope this helps,
      Ben

      On Tue, Mar 11, 2014 at 10:49 AM, Claudio de Castro Coutinho Filho coutinhoware@users.sf.net wrote:

      Hello, friends! At first I'd like to thank all the involved in this
      project's development for their work.

      I'd like to ask if it's possible to generate a .bin file with an actual
      information-carrying signal. As I noticed from the Octave code, the
      Resource Elements (RE) are not being used when the .bin file is generated.

      As you can see in the plots below (Slot 0 and Slot 1), at the receiver,
      some symbols seem not to transmit any data at all. They seem to keep only
      the PBCH info etc.

      [image: Slot 0]

      [image: Slot 1]

      Am I making any mistake, or is that a way to carry actual information?

      (I plan to use this as part of my Masters thesis)

      Thanks in advance!

      LTE actual(?) signal?https://sourceforge.net/p/openlte/discussion/general/thread/8e6c730f/?limit=25#8ec4

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