Doc.: IEEE 802.11-10/1305r0 Submission November 2010 Emmanuel Monnerie (Landis+Gyr), John Buffington (Itron)Slide 1 IEEE 802.15.4g OFDM PHY Overview Date:

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doc.: IEEE /1305r0 Submission November 2010 Emmanuel Monnerie (Landis+Gyr), John Buffington (Itron)Slide 1 IEEE g OFDM PHY Overview Date: Authors:

doc.: IEEE /1305r0 Submission Design goals for SUN PHY for outdoor wireless communication High density deployment with up to 3 collocated networks. Low cost device Low power device Robust PHY Data rate up to 1Mbps and higher than 40kbps Frame size up to 1500 bytes 2 Emmanuel Monnerie (Landis+Gyr), John Buffington (Itron) November 2010

doc.: IEEE /1305r0 Submission OFDM Options g OFDM Option 1Option 2Option 3Option 4Unit Sampling Rate Samp/sec FFT size Tone Spacing Hz FFT Duration96 microsec Guard Interval24 microsec Symbol Duration120 microsec Symbol Rate8.333 kSym/sec Active Tones # Pilots tones8422 # Data Tones # DC null tones1111 Approximate Signal BW kHz Modulation TypeMCS #Data Rates BPSK 1/2 rate coded and 4x repetition kbps BPSK 1/2 rate coded and 2x repetition kbps QPSK 1/2 rate coded and 2x repetition kbps QPSK 1/2 rate coded kbps QPSK 3/4 rate coded kbps 16-QAM 1/2 rate coded kbps 16-QAM 3/4 rate coded kbps 3 Emmanuel Monnerie (Landis+Gyr), John Buffington (Itron) November 2010

doc.: IEEE /1305r0 Submission Similarities with Same bit-to-symbol mapping Same convolutional encoder (1/2 rate, constraint length K=7, generator polynomial g0=133 and g1 = 171) Same puncturer for ¾ rate coding Same interleaver Option 2 has the same number of active tones (52) and same number of pilot tones (4) Similar STF, LTF, Header, Tail and Pad structure 4 Emmanuel Monnerie (Landis+Gyr), John Buffington (Itron) November 2010

doc.: IEEE /1305r0 Submission Differences with OFDM narrow band options are based on operating clock shrink: tone spacing reduction, guard interval increase g options are based on different FFT sizes: constant tone spacing and cyclic prefix 5 Active Tones Tone SpacingGuard Interval kHz0.8 us MHz 54Mbps kHz1.6 us MHz 27Mbps kHz3.2 us MHz 13.5Mbps kHz6.4 us MHz 6.75Mbps kHz24 us g 200kHz 300kbps g 300kHz 600kbps g 600kHz 800kbps g 1.2MHz 800kbps ah ? Emmanuel Monnerie (Landis+Gyr), John Buffington (Itron) November 2010

doc.: IEEE /1305r0 Submission Next steps to work on… Analyze and resolve potential issues around MAC and TG4g PHY interface (CRC, PHY settings, etc.) Explore some new options with data rates between 800kbps and 6.75Mbpses? Further scaling down of and/or scaling up TG4g options with data rates above 800kbps. Slide 6Emmanuel Monnerie (Landis+Gyr), John Buffington (Itron) November 2010

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