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Wideband double directional propagation channel mode (WDDCM)

Concerning the physical issues that inherently and transversally determine the performance of several standards, especially in their simultaneous application, work has evolved from the generation of a Wideband Double Directional Propagation Channel Model (WDDCM). After having defined its parameters, and going forth with an assessment stage, its simulator implementation has been provided to partners within other WPs. The flexibility that the IST-TUL WDDCM involves allows for its implementation within MIMO frameworks. Additionally, although being a physically-based single-bounce scatterer/cluster model, work has explicitly shown how such model closely relates to the FTW MIMO model, also presented in FLOWS WP2.

For the use at the propagation level, several propagation scenarios have been defined. These were anyhow related to issues at other levels, e.g., traffic or simultaneous use of standards.

Finally, it has been shown, together with the produced simulator, that including coupling effects within the antenna array elements does not significantly affect the array radiation pattern. Such study has been possible due to the flexibility in the use of the WDDCM simulator. Results were provided considering both coupling and no-coupling among antenna array elements. For this purposes, a real dual-band (UMTS and HIPERLAN/2 frequency bands) microstrip patch antenna linear array, developed within the scope of FLOWS (WP3), was considered. Generally, for the given antenna array, no significant differences in the radio channel characteristics were observed when considering coupling effects.

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