March 2012 doc IEEE 802 11 120348 r

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March 2012 doc. : IEEE 802. 11 -12/0348 r 2 1 MHz STF Issues

March 2012 doc. : IEEE 802. 11 -12/0348 r 2 1 MHz STF Issues ` Date: 2012 -03 -12 Authors: Submission Slide 1 Inter. Digital Communications

March 2012 doc. : IEEE 802. 11 -12/0348 r 2 Abstract This document highlights

March 2012 doc. : IEEE 802. 11 -12/0348 r 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. Submission Slide 2 Inter. Digital Communications

March 2012 doc. : IEEE 802. 11 -12/0348 r 2 802. 11 ah preamble

March 2012 doc. : IEEE 802. 11 -12/0348 r 2 802. 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 d. B power boost only for MCS 0 -Rep 2 Low PAPR: 0. 46 d. B Submission Slide 3 Inter. Digital Communications

March 2012 doc. : IEEE 802. 11 -12/0348 r 2 Correlation of 2 MHz

March 2012 doc. : IEEE 802. 11 -12/0348 r 2 Correlation of 2 MHz STF • STF correlation has >10 d. B difference between peaks and next highest value Submission Slide 4 Inter. Digital Communications

March 2012 doc. : IEEE 802. 11 -12/0348 r 2 Correlation of Current 1

March 2012 doc. : IEEE 802. 11 -12/0348 r 2 Correlation of Current 1 MHz STF • Proposed STF has worse correlation than 2 MHz STF: will perform poorly even with 3 d. B power boost. Submission Slide 5 Inter. Digital Communications

March 2012 doc. : IEEE 802. 11 -12/0348 r 2 Conclusions • Current 1

March 2012 doc. : IEEE 802. 11 -12/0348 r 2 Conclusions • Current 1 MHz STF issues: • • Submission Poor correlation properties compared to existing structures. Unnecessarily complex (3 d. B boost, reduced shoulders to reduce PAPR). Slide 6 Inter. Digital Communications

March 2012 doc. : IEEE 802. 11 -12/0348 r 2 Straw Poll • Consider

March 2012 doc. : IEEE 802. 11 -12/0348 r 2 Straw Poll • Consider re-work of current STF or a new STF that has correlation properties similar in performance to the 2 MHz STF. Submission Slide 7 Inter. Digital Communications