Implementation challenges of UWB for works.ppt

UWB4SN – November 2005 Implementation challenges of UWB for works Laurent Chalard, Didier H é lal , Gian-Mario Maggio, Yinqwei Qiu, Lucille Verbaere-Rouault, Armin Wellig, Julien Zory STMicroelectronics, Geneva, Switzerland UWB4SN – November 2005 Content ? Introduction ? Market/Application requirements ? Regulation ? Standardization ? Wireless Sensor Mote – Link budget – MAC – Synchronization – FEC ? Conclusions UWB4SN – November 2005 A problem under constraints Innovative WSN solutions Ready for market Market plete mote solution ST ’ s patibility Standard petitive advantage UWB4SN – November 2005 Major Limitations to Global Wireless Sensor Adoption Source ON-World 2004 Ease/install Reliability Interference Battery Cost Interoperability Security Bit rate No need Size UWB4SN – November 2005 Application requirements expressed at IEEE Applications' requirements 1 10 100 1000 1 10 100 1000 10000 Range (meter) Data rate (kbps) + ranging with accuracy inside 5% of range Low data rate does not mean simple ! UWB4SN – November 2005 Regulation ? No harmonization done by ITU-R so far …? EC f inal decision in March 2006 ? Low data rate is still under discussions – duty cycle ? Minimum average burst repetition period over an hour 1 sec ? Minimum instantaneous burst repetition period over 1 second 30 to 200ms – emission level limitation - or -45dBm/MHz UWB4SN – November 2005 Standardization (1) ? Standards has exhibited limitations up to know for wireless work applications ? : poor reliability ? Zigbee: plex ? WiFi: too expensive ? BT: limited in number of nodes ? Now appear 3 different alternate PHY options in IEEE ? Low-band UWB [DC-960MHz] ? Chirp Spread Spectrum [ ISM band] ? High band UWB [-] UWB4SN – November 2005 Standardization (2) IEEE status ? Band plan defined ? PRF will be a multiple of ? Perfect Balanced Ternary Sequences (PBTS) of length 31 and 127 have been agree