LTE Downlink Link Level Simulator

Welcome to the TU Wien's Institute of Telecommunications' LTE simulator page. Here you will be able to get the last available version of the in-house developed, Matlab-based Downlink Physical Layer (Link Level).

The simulators are released under the terms of an academic, non-commercial use license. Please read the license agreement in case of doubt.

If you are experiencing problems with downloading or using the simulator please contact Josep Colom Ikuno or Michal Šimko.

License

The LTE simulators are published under a non-commercial academic use license. Please make sure that you understand the terms and conditions of the license before you download any of the available software packages. Would you require a license different to a non-commercial academic one please contact Josep Colom Ikuno or Michal Šimko.

Downlink Link Level Simulator

The detailed license agreement for the LTE Link Level simulator can be found here. Please read the license agreement carefully, as parts of the code are under the GNU Lesser General Public License, and the MIT License.

Software requirements

The LTE simulators are implemented in Matlab and require the following packages:

Matlab 7.8.0 (R2009a)
Communications Toolbox 4.1
Signal Processing Toolbox 6.7

Newer versions of the above packages should be supported, however, this was not tested.

Since the LTE simulators make use of the new Object-Oriented capabilities of Matlab (available since R2008a), the simulators will not run under older Matlab releases without extensive changes.

Please read THIS if you have problems/questions about the C code/MEX files included with the release.

Questions

For questions please check our forum, where you will be able to post your questions/comments/bug reports.

LTE Downlink Link Level Simulator Package description

The main file of the LTE Downlink Link Level Simulator is LTE_sim_main.m, though you may normally run the simulation through a batch file such as LTE_sim_batch.m, which performs the following tasks:

Setting the SNR range for the simulation.
Loading a configuration file.
Executing the LTE_sim_main.m main simulation file.
Saving the results to a file.

The simulator allows for the following settings to be adjusted (please check the documentation for a complete list):

Number of User Equipments (UEs) attached to the eNodeB.
Uplink delay
Number of frames to simulate
SNR
transmit and receive antenna numbers
channel model
transmit mode (as defined by the standard)
scheduling algorithm

The released package also contains examples on how to use the simulator and plot its results.

A short note on sampling frequency: all LTE devices are required to work with 20MHz, thus they always sample with the 30.7MHz that are required in that case. Our simulator is working with the sampling frequency matched to the actual bandwidth. We are doing this to reduce the complexity of the simulation. If desired, a simulation with larger sampling frequency can be implemented easily.

LTE Downlink Link Level Simulator functionality

The LTE Link Level Simulation is still under development and as such, new features are planned to be added. For a complete list of all the functionalities, please refer to the documentation included with the simulator.

3rd party code

The LTE Downlink Link Level Simulator contains code from the following sources:

Iterative Solutions Coded Modulation Library (ISCML). An open source toolbox for simulating capacity approaching codes in Matlab. It is licensed as free software under the lesser GPL license.
pycrc. A free, easy to use Cyclic Redundancy Check (CRC) calculator and source code generator. pycrc and its generated code are licensed under the MIT license.

Version history

Please refer to the documentation for the changelog and version history.

If you want to receive information about future updates you can subscribe to our LTE simulator mailing list here. Note that you can change the display language to english in the selection panel to the right.

LTE Link Level Simulator Download

The last version of the simulator, as well as the previous ones can be downloaded from our download section.

You will be asked to enter your name, email address, affiliation and country. After entering this information and accepting the license agreement, you will be allowed to download the simulator.

LTE Link Level Simulator referencing

A version of the LTE Downlink Link Level Simulator paper is available in our publication data-base here.

If you are using the simulator for your scientific work, please use the refence below:

@InProceedings{EUSIPCO2009,
  author =        {Christian Mehlf\"uhrer and Martin Wrulich and Josep Colom Ikuno and Dagmar Bosanska and Markus Rupp},
  title =         {Simulating the Long Term Evolution Physical Layer},
  booktitle =     {Proc. of the 17th European Signal Processing Conference (EUSIPCO 2009)},
  month =         aug,
  year =          2009,
  address =       {Glasgow, Scotland},
  url =           {http://publik.tuwien.ac.at/files/PubDat_175708.pdf},
}

C. Mehlführer, M. Wrulich, J. C. Ikuno, D. Bosanska and M. Rupp, "Simulating the Long Term Evolution Physical Layer," in Proc. of the 17th European Signal Processing Conference (EUSIPCO 2009), Aug. 2009, Glasgow, Scotland. [Online].
Available: http://publik.tuwien.ac.at/files/PubDat_175708.pdf

The People (so far) behind the development of the Downlink LTE Link Level simulator

Dagmar Bosanska, Josep Colom Ikuno, Govinda Lilley, Christian Mehlführer, Markus Rupp, Stefan Schwarz, Michal Šimko, Qi Wang, and Martin Wrulich.

Publications

Relevant Publications (from publication database)

Acknowledgements

This work has been funded by A1 Telekom Austria AG and the Christian Doppler Laboratory for Design Methodology of Signal Processing Algorithms.