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Channel model need for 802.11ah

Channel model need for 802.11ah. Authors:. Date: 2010-11-08. Summary. System performance depends on channel measurement/modeling Existing measurements and models do not include the combination of applications and environments envisioned by 802.11ah

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Channel model need for 802.11ah

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  1. Channel model need for 802.11ah Authors: Date: 2010-11-08 Roberto Aiello, Jim Lansford

  2. Summary • System performance depends on channel measurement/modeling • Existing measurements and models do not include the combination of applications and environments envisioned by 802.11ah • We are evaluating measurements both for single and multi-antenna (MIMO) propagation channels Roberto Aiello, Jim Lansford

  3. Existing channel model • Existing IEEE 802.11n channel model • based on (single-antenna) measurements at 2.4GHz (Medbo et al.) • augmented by spatial dispersion characteristics (Erceg et al.) • Main parameters included • Path loss • shadowing • delay dispersion • angular dispersion • Doppler effect Roberto Aiello, Jim Lansford

  4. Issues • Unclear if model is applicable to 900MHz • Channel characteristics and interference are significantly different • Path loss scales with frequency • Many objects are smaller than a wavelength at 900MHz (~30cm) but larger than a wavelength at 5GHz (5 cm) • Shadowing and specular reflection effects will be very different • Delay spread shows a large difference (almost factor of 5) between 5.8 GHz and 900 MHz, and even more to 400MHz • Will almost certainly see big differences in delay spread (and coherence bandwidth) • Significant degradation for incorrect guard interval and symbol time • Deployment scenario in the 900MHz band will be different from 2.4GHz and 5GHz (i.e. placed against wall instead of portable) • Significantly larger AP footprint will create challenging congestion issues • Existing 2.4 GHz access point to client channel model is not sufficient for the 900MHz band deployment • New measurement and model is required Roberto Aiello, Jim Lansford

  5. Channel model plan • Collaboration with University of Colorado at Boulder • Plan • Perform measurements at 900MHz in different environments • Extract relevant parameters (path loss, delay spread, etc.) • Establish generic channel model • Schedule • Jan 2011 – present preliminary results • Mar 2011 – present final results • Advantages • Allow comparison platform for various proposal • Ensure that new 802.11ah PHY performs well in real environments Roberto Aiello, Jim Lansford

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