Working Group 2 – Radio Channel
Chairman: Prof. Alain Sibille, ENSTA-ParisTech, France
The "radio channel" comprises all parts of the physical medium between the input port(s) of the transmitting antenna(s) and the output port(s) of the receiving antenna(s). Based on this definition, a key feature of WG2 is the recognition that the radio channel is a limiting factor of all wireless networks, but also that its full assessment enables the improvement of performances or capabilities through a suitable design of the communication systems. The separation between the contribution of antennas and that of the propagation medium, but also the identification of non separable phenomena are of particular interest. Accordingly, WG2 activities are carried out with respect to their impact on such systems, which implies awareness about physical and higher layer issues. In this respect WG 2 also plays a linking role between the activities of the various sub-working groups (SWG) and special interest groups (SIG), as regards the radio channel.
All topics on propagation, channels and antennas relevant to communications, which are not better covered by the other WGs, SWGs and SIGs, are in principle of interest for WG 2. However two approaches are preferentially targeted:
The first is a “traditional” approach where the goal is an improvement in the understanding and the modelling of the essential and universal features of radio propagation and of single/multiple antenna systems.
The second approach is more “proactive” and addresses the new requirements put on the assessment of radio channel properties, for the successful development of novel wireless communication systems & services. This implies analysing the specific scenarios, parameters, and system configurations having a consequence on radio channel issues, and to specify accordingly the investigations to be carried out. This also implies to identify the future scientific and technical challenges incurred by the development of these new systems, in the area of propagation and antennas. As a consequence one important goal of WG 2 is to critically discuss, enrich and promote novel, unconventional or far advanced ideas and methods, in this area.
The main topics include:
- Physical propagation mechanisms, at specific bands of the radio spectrum in the micro- and millimetre-wave bands;
- Radio propagation modelling techniques, for faster simulations or greater accuracy;
- Measurements and advanced analysis of the polarised, double directional radio channels, for meaningful parameter extraction;
- Advanced MIMO channel sounding techniques
- Identification of the propagation specificities of multihop and relay networks, muti-user access, and sensor networks;
- Frequency dependence of the propagation, and consequences on radio channels for multi standard and cognitive radio systems;
- Statistical antenna models and UWB antenna models, taking into account antenna dispersions and antenna environment variability;
- Analysis/modelling of antenna performance in unfavourable environments;
- Propagation in unusal materials/environments relevant to new wireless communications applications.