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doc.: IEEE 802.15-<doc#>
<month year> doc.: IEEE <doc#> Mar 2013 Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [FSK PHY Channelization and Data Rate Proposal] Date Submitted: [March 19th, 2013] Source: [Andy Bottomley] Company [Microsemi] Address [15822 Bernardo Center Dr, Ste B, San Diego, CA, 92127] Voice:[ ] FAX :[ ] ] Re: [In response to TG4n PAR] Abstract: [] Notice: This document has been prepared to assist the IEEE P 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 P Andy Bottomley (Microsemi) Rick Powell (Microsemi)
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FSK PHY Recommendation
<month year> doc.: IEEE <doc#> Mar FSK PHY Recommendation To facilitate ultra low power battery powered n devices for hospital sensor applications and other medical low power applications it is recommended that an FSK PHY is adopted. Adoption of an FSK PHY would be in-line with current PHY amendments ( g & k) An FSK PHY is also being proposed for q where power consumption is critical (# q) This presentation proposes channel spacing, data rates and modulation indexes for n Andy Bottomley <author>, <company>
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doc.: IEEE 802.15-<doc#>
<month year> doc.: IEEE <doc#> Mar Channel Spacing Proposal Channel spacing of 500kHz can support data rates of 400kbps facilitating low energy per bit data transfer Channel spacing of 250kHz can support 200kbps & offers more channels and improved sensitivity modes Both 500kHz & 250kHz channel spacing coexist well with O- QPSK 2MHz channel spacing Andy Bottomley <author>, <company>
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doc.: IEEE 802.15-<doc#>
<month year> doc.: IEEE <doc#> Mar Modulation Index Definition fd = max peak deviation frequency h = modulation index M = 2 or 4 (2-FSK or 4-FSK) Example of 2-FSK & 4-FSK with the same modulation index and same data rate Andy Bottomley <author>, <company>
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doc.: IEEE 802.15-<doc#>
<month year> doc.: IEEE <doc#> Mar 2-FSK or 4-FSK? 2-FSK or 4-FSK could both be used for the 400kbps ‘Low Energy Mode’ The 99% occupied bandwidth of 2-FSK or 400kbps is approximately the same with a modulation index of 0.7 The Eb/No is the same with a modulation index of 0.7 The digital timing recovery may consume a little less current for a 4-FSK symbol rate of 200ksps compared to a 2-FSK symbol rate of 400ksps but this may be offset by the extra digital required to support a multi-level demodulator As there appears to be no significant performance benefit in using 4-FSK over 2-FSK it is proposed that 2-FSK is used for all modes Andy Bottomley <author>, <company>
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doc.: IEEE 802.15-<doc#>
<month year> doc.: IEEE <doc#> Mar Eb/No Sweep of Modulation Index for 2-FSK 400kbps ‘Low Energy Mode’ Channel filter 3dB bandwidth = 500kHz 3rd order Butterworth channel filter BT = 1 0.7 is the optimal modulation index for an Eb/No of 9.2dB at 0.1% BER Andy Bottomley <author>, <company>
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doc.: IEEE 802.15-<doc#>
<month year> doc.: IEEE <doc#> Mar Eb/No Sweep of Modulation Index for 2-FSK 200kbps Mode Channel filter 3dB bandwidth = 250kHz 3rd order Butterworth channel filter BT = 1 0.7 is the optimal modulation index for an Eb/No of 9.2dB at 0.1% BER Andy Bottomley <author>, <company>
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doc.: IEEE 802.15-<doc#>
<month year> doc.: IEEE <doc#> Mar Occupied Bandwidth vs Modulation Index for 2-FSK 400kbps mode Occupied bandwidth increases with modulation index Andy Bottomley <author>, <company>
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doc.: IEEE 802.15-<doc#>
<month year> doc.: IEEE <doc#> Mar Occupied Bandwidth vs Modulation Index for 2-FSK 200kbps mode Occupied bandwidth increases with modulation index Andy Bottomley <author>, <company>
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doc.: IEEE 802.15-<doc#>
<month year> doc.: IEEE <doc#> Mar Modulation Index Summary & Proposal Modulation index of 0.7 provides best Eb/No performance: 9.2dB Eb/No at 1e-3 BER for 2-FSK 200kbps mode 9.2dB Eb/No at 1e-3 BER for 2-FSK 400kbps mode 2-FSK, 400kbps, Modulation Index 0.7 2-FSK, 200kbps, Modulation Index 0.7 Andy Bottomley <author>, <company>
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doc.: IEEE 802.15-<doc#>
<month year> doc.: IEEE <doc#> Mar Adjacent Channel & Alternate Channel Rejection Requirements specifies 0dB & 24dB ACR & ALTCR using a modulated interferer k draft v3 specifies 10dB & 30dB ACR & ALTCR using a modulated interferer g draft v7 specifies 10dB & 30dB ACR & ALTCR using a CW at centre of channel Simulation results in the next slide are used to guide the requirement chosen for n Andy Bottomley <author>, <company>
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doc.: IEEE 802.15-<doc#>
<month year> doc.: IEEE <doc#> Mar ACR & ALTCR Simulation Results for 2-FSK 200kbps Mode, 250kHz Channelization BT = 1 Modulation index 0.7 99% occupied bandwidth 291kHz 3rd order Butterworth channel filter with 250kHz +/-10% The modulated interferer is the same as the wanted signal Channel Filter BW (kHz) CW Interferer ACR (dB) ALTCR(dB) Modulated Interferer ACR (dB) ALTCR(dB) 225 - 250 4.5 36 275 21.8 56 2.8 34.6 Andy Bottomley <author>, <company>
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doc.: IEEE 802.15-<doc#>
<month year> doc.: IEEE <doc#> Mar Proposal for Channel Rejection Specification Based on the simulation results it is recommended that the g rejection specification is used: ACR 10dB & ALTCR 30dB using a CW interferer This facilitates a simple 3rd order channel filter with +/-10% bandwidth tolerance and offers some margin in meeting the requirements Andy Bottomley <author>, <company>
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doc.: IEEE 802.15-<doc#>
<month year> doc.: IEEE <doc#> Mar Overall FSK PHY Proposal 500kHz channelization to support 400kbps ‘Low Energy Mode’ 250kHz channelization to support greater number of channels Spreading option to provide extra robustness to interference Gaussian filter (BT=1) on TX Symbol Rate (ksps) Mod Index Data Rate (kbps) Modulation Type Channelization (kHz) 400 0.7 4001 2-FSK 500 200 2001 250 100 50 25 Note 1: A spreading factor of 8, 4 & 2 to be offered for this mode as an alternative way to generate lower data rates and spread the spectrum Andy Bottomley <author>, <company>
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doc.: IEEE 802.15-<doc#>
<month year> doc.: IEEE <doc#> Mar Supporting Slides Andy Bottomley <author>, <company>
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doc.: IEEE 802.15-<doc#>
<month year> doc.: IEEE <doc#> Mar Comparing Occupied Bandwidth vs Modulation Index for 2-FSK 400kbps & 4-FSK 400kbps At a modulation index of 0.7 the 99% emission bandwidth is similar Andy Bottomley <author>, <company>
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doc.: IEEE 802.15-<doc#>
<month year> doc.: IEEE <doc#> Mar 4-FSK 400kbps (200ksps) Modulation Index Sweep Andy Bottomley <author>, <company>
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doc.: IEEE 802.15-<doc#>
<month year> doc.: IEEE <doc#> Mar 4-FSK 400kbps (200ksps) Occupied Bandwidth with Modulation Index Andy Bottomley <author>, <company>
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