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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [4 33 MHz PHY Enhancements ] Date Submitted: [05 May , 2011] Source: [Dalibor Pokrajac] Company [Guard RFID Solutions] Address [#8 – 1600 Derwent Way, Delta, BC, V3M 6M5, Canada]

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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

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  1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [433 MHz PHY Enhancements] Date Submitted: [05 May, 2011] Source: [Dalibor Pokrajac] Company [Guard RFID Solutions] Address [#8 – 1600 Derwent Way, Delta, BC, V3M 6M5, Canada] Voice:[604-998-4018], E-Mail:[dalibor.pokrajac@guardrfid.com] Contributors: [Dalibor Pokrajac (GuardRFID)] Abstract: [433 MHz PHY Channel Plan Changes] Purpose: [To be considered during 802.15.4f standard development process] Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15. Dalibor Pokrajac, Guard RFID Solutions

  2. 433 MHz PHY Proposed Channel Plan Changes Dalibor Pokrajac, Guard RFID Solutions

  3. Current Channel Plan for 433 MHz PHY • Data Rate: • 250 kb/s (3 channels, 580 kHz wide) • 31.25 kb/s (7 chanels, 60 kHz wide) • Modulation: MSK 1.74 MHz 500 kHz 433.05 433.67 434.17 434.79 434.04 433.34 434.10 433.80 433.86 433.98 433.74 434.50 433.92 f [MHz] Dalibor Pokrajac, Guard RFID Solutions

  4. Shortfalls of Current Channel Plan • Channel width for 31.25 kb/s channels is only 60 kHz • This allows 20 dB stop band attenuation but not much more • There is a sufficient bandwidth within 433 MHz band to increase 31.25 kb/s channel width to more • The entire allowable 433 MHz band is not fully occupied by 31.25 kb/s channels • Only 500 kHz out of 1.74 GHz is occupied • More channels could be added to provide better in-band coexistence, especially when 250 kb/s channels need to co-exist with 31.25 channels • There is a significant difference between “Slow” and “Fast” data rate channels (31.25 kbps and 250 kb/s) • Addition of “intermediate” data rate (100 kb/s) provides optimum between channel occupancy time vs. RX sensitivity Dalibor Pokrajac, Guard RFID Solutions

  5. Proposed Channel Plan for 433 MHz PHY • Data Rate: • 250 kb/s (3 channels, 580 kHz channel width) • 100 kb/s (5 channels, 348 kHz channel width) • 31.25 kb/s (15 channels, 108 kHz channel width) • Modulation: MSK Additional 60 kHz guard band to allow for more stringent regulatory requirements for out-of-band emissions 580 kHz 348 kHz 108 kHz 250 kbps 100 kbps 433.92 31.25 kbps 433.05 434.79 f [MHz] 434.730 433.110 1.74 MHz Dalibor Pokrajac, Guard RFID Solutions

  6. Summary Channel Plan Dalibor Pokrajac, Guard RFID Solutions

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