Background

In May 2010, part of the UHF frequency range has been auctioned off to mobile network operators in Germany for the new mobile radio technology (LTE). This part of the spectrum is no longer available for wireless audio equipment at cultural-, sports- and music events, at TV shows, musicals, and so on. Organizers and PMSE manufacturers are concerned about this situation and fear bold implications on the events and the used technical equipment.

The auctioning of the frequency range 790 - 862 MHz to the mobile radio industry, the so called Digital Dividend, that was  one of the major frequency ranges for professional wireless microphone systems (PWMS) in Germany, restricts the overall usable frequency range for PWMS. This restrictions concerns many fixed installations, e.g. at theatres, opera houses, churches and sports facilities, but also mobile touring equipment used by event organizers.

Begin of May 2011, the research project C-PMSE - „Cognitive Program Making and Special Event“ has been started, to work on solutions to improve the frequency utilization and coexistence for PMSE Systems by Cognitive Methods.

Independent from a political solution for the considerable restrictions of the PMSE users due to the Digital Dividend, the C-PMSE project is studying – with wireless microphones as example application - cognitive methods for the effective utilization of the frequency spectrum.

The most important objective in this project is the preservation and possibly increase of the operational reliability under the conditions of dynamic and heterogeneous frequency utilization. The basic idea is, to scan continuously the usable frequency range against potential risks. As soon as potential interferers are detected, countermeasures will be initiated. The basic principle sounds quite easy, but it requires very complex interactions between different components, which are currently - with the required specifications - not available on the market or are still under research.

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