GEDOMIS®

GEneric DemOnstrator for Modular and agIle SDR Systems (GEDOMIS®)

GEDOMIS® is a highly customizable testbed comprising a number of software defined radio (SDR) platforms, which can be used to develop 5G and beyond wireless communication systems, targeting below 6 GHz applications. In addition, GEDOMIS® includes a real-time multi-channel channel emulator and other test & measurement (T&M) equipment to facilitate the validation of realistic radio communications scenarios, before conducting field trials. The hardware and software building blocks of GEDOMIS® can be configured, customized and programmed according to different prototyping or experimental needs.

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GEDOMIS_simplified_block_diagram

 

Featured integrated proof-of-concept

Starting from 2009, GEDOMIS® has been used to prototype and showcase a number of real-time SDR demonstrators. The most complex development carried out in GEDOMIS®, was a propriety implementation of the DL LTE PHY-layer (eNB and UE), which was interfaced with a suitably modified version of the ns-3 LTE extensions (LENA). The latter was hosted in a purpose-built customization of CTTC’s EXTREME® testbed.  The interfacing of the two testbeds and the key modifications applied to LENA were the following:

  1. The single software process of LENA was divided into three separate processes (i.e., for the eNB, UE and EPC), allowing to execute these processes in different computers/servers.
  2. The abstracted PHY-layer of LENA was substituted with the one developed in GEDOMIS®.
  3. The two testbeds were connected through a custom PHY-MAC interface, which guaranteed uninterrupted real-time connectivity between the two layers.

This joint end-to-end real-time demonstrator added over-the-air testing capabilities to LENA and helped to validate different RAN functional splits and KPIs.