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1 MHz STF Issues

`. 1 MHz STF Issues. Authors:. Date: 2012-03-12. Abstract. This document highlights issues with the current 1 MHz STF design and recommends discussion/work to improve the signal to enable better coarse timing acquisition. 802.11 ah preamble specification for 1 MHz. STF Sequence:

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1 MHz STF Issues

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  1. ` 1 MHz STF Issues Authors: • Date:2012-03-12 InterDigital Communications

  2. Abstract • This document highlights issues with the current 1 MHz STF design and recommends discussion/work to improve the signal to enable better coarse timing acquisition. InterDigital Communications

  3. 802.11 ah preamble specification for 1 MHz • STF Sequence: • Tone Index: [-12 -8 -4 4 8 12]: 5 repetitions in 1 OFDM symbol. • Values: [0.5 -1 1 -1 -1 0.5]*(1 + i) • 3 dB power boost only for MCS0-Rep2 • Low PAPR: 0.46 dB InterDigital Communications

  4. Correlation of 2 MHz STF • STF correlation has >10 dB difference between peaks and next highest value InterDigital Communications

  5. Correlation of Current 1 MHz STF • Proposed STF has worse correlation than 2 MHz STF: will perform poorly even with 3 dB power boost. InterDigital Communications

  6. Conclusions • Current 1 MHz STF issues: • Poor correlation properties compared to existing structures. • Unnecessarily complex (3 dB boost, reduced shoulders to reduce PAPR). InterDigital Communications

  7. Straw Poll • Consider re-work of current STF or a new STF that has correlation properties similar in performance to the 2 MHz STF. InterDigital Communications

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