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Sub Working Group 2.3 - Reference Channel Modeling

Chairman: Prof. Claude Oestges, Université catholique de Louvain, Belgium

The focus of this SWG is to establish reference models to be used by system designers and researchers. This implies that an unified model should be proposed, which is simple and accurate. To this end, this SWG has identified two main tasks in the area of reference channel modeling

The first task is the completion of the COST 273 channel model. This relies mostly on measurement campaigns and extractions of parameters. Finally, the validation is also a crucial step, along the lines of the arguments of Ernst Bonek in COST273: "What makes a good model and how to quantify that?". The following detailed objectives have been proposed.

  • Investigate the temporal behavior caused by moving scatterers,
  • Include diffuse scattering in the model.
  • Investigate the frequency robustness and dependence.

The second task is to extend the reference model by considering several aspects. Two main aspects have been identified.

  • Polarization model. Many models use very simplistic assumptions. Among others, is depolarization a matter of rotation only? What is the phase behavior in dual-polarized transmission? How does the co-polar ration vary in different environments? These are very important questions, to which this SWG could bring much needed answers.
  • Multi-link channel modeling. This research axis deals with large scale spatial correlations, considering what might be called macro-MIMO or MU-MIMO schemes, including interference aspects. Whereas the COST 273 formalism is multi-user by essence, this aspect was not really verified by measurements. Also, ad-hoc and cooperative networks have come to play a big role in communications, and such scenarios have not been considered so far by a well-established reference model.