State-Of-The-Art PMSE

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Presentation transcript:

State-Of-The-Art PMSE C-PMSE – Improving frequency utilization and coexistence for PMSE systems by cognitive procedures Demonstration 2: State-Of-The-Art PMSE Dr. Axel Schmidt Sennheiser electronic GmbH & Co. KG

Introduction to PMSE PMSE: Programme Making and Special Event Services ancillary to programme making (SAP) Services ancillary to broadcasting (SAB) Electronic news gathering (ENG) Outside broadcasting (OB) Professional Wireless Microphone System unidirectional wireless audio link Dr. Axel Schmidt, Sennheiser electronic GmbH & Co. KG

Professional Wireless Microphone System Requirements High audio quality Low latency (analogue audio in -> analogue audio out) Robustness Technology Analogue FM / several digital transmission schemes 200kHz channel bandwidth (according to ETSI EN 300422) Typical maximum output power of 17dBm (50mW) IrDA interface for synchronization audio link settings between RX and TX over short distances (not during operation) Frequency range Secondary user in UHF (470MHz – 790MHz) 1.8GHz (in Germany only) Dr. Axel Schmidt, Sennheiser electronic GmbH & Co. KG

Multi-Channel Application Available frequency range is divided into useable wireless audio channels which must not interfere each other One audio channel occupies 200kHz bandwidth It needs a minimum distance to its neighbour channel of e. g. 600kHz Dr. Axel Schmidt, Sennheiser electronic GmbH & Co. KG

Multi-Channel Application Two audio transmitters produce intermodulation products when coming close to each other Spectrum potentially occupied by IM3 products is not usable for high quality audio transmission Dr. Axel Schmidt, Sennheiser electronic GmbH & Co. KG

Multi-Channel Application Similar problem at receiver side on first intermediate frequency when front end has low intercept point Two strong signals produce intermodulation products and reduce SNR of wanted signal Dr. Axel Schmidt, Sennheiser electronic GmbH & Co. KG

Multi-Channel Application N audio channels generate N*(N+1) IM3 products Dr. Axel Schmidt, Sennheiser electronic GmbH & Co. KG

Multi-Channel Application But there are some more intermodulation products IM5 products IM3 products of 3 transmitter … which all reduce the usable frequency range Frequency planning is necessary to make multi-channel applications possible Software tools for initial planning, monitoring and controlling wireless systems (WSM) Dr. Axel Schmidt, Sennheiser electronic GmbH & Co. KG

Current Limitations Static frequency assignment Predefined spare frequencies / links in case of emergency No / limited remote control of audio mobile terminal during operation No possibility to react on dynamical changes in spectrum allocation Dr. Axel Schmidt, Sennheiser electronic GmbH & Co. KG