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Communications Technology Laboratory

Public Safety Communications Research Division

Propagation Channel Models & System Performance

Propagation Channel Models and System Performance_On-Demand Session — The next generation of emergency responder systems will be based on LTE, as the use of commercial oﬀ-the-shelf components will lead to a dramatic decrease in cost. However, since PSOs (Public Safety Organizations) often need to operate in areas where there is no cellular infrastructure (either by design, or because the infrastructure is nonoperative after a natural disaster), it is essential that DMO (Direct Mode Operation), also known as Device-to-Device (D2D) communication is fully operational and reliable. At the current time, the D2D mode of LTE is still under development, and no proper testing has been done yet.A key requirement is testing in realistic channels; it is not suﬃcient to analyze performance with the 3GPP (or similar) channel models, as those are intended to compare diﬀerent systems, not to evaluate absolute performance and reliability.The key goal of this project is thus to perform extensive measurement campaigns for D2D channels, in particular concentrating on channels that are most important for PSOs, namely (i) channels for vehicle-to-vehicle (V2V) communications, including convoys, and (ii) indoor-to-outdoor (I2O) channels, where one mobile device is outdoors at street level, and the other indoors, possibly at a higher ﬂoor. For those scenarios, existing measurements are missing critical components such as (i) suﬃcient number of measurements to provide statistical viability, (ii) directional channel characteristics (which are needed to evaluate multi-antenna terminals), and (iii) evolution of channel characteristics when the device moves on a trajectory.

Speakers

Andreas Molisch, University of Southern California
Hussein Hammoud, University of Southern California

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Created May 19, 2020, Updated October 27, 2020