Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [ Consideration for Radio Specification Comments ] Date Submitted: [ 14 January 2011 ] Source: [ Steve Jillings ] Company [ Semtech ] Address [ 200 Flynn Rd, Camarillo, CA, 93012 ]

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

Submission Title: [Consideration for Radio Specification Comments]

Date Submitted: [14 January 2011]

Source: [Steve Jillings] Company [Semtech]

Address [200 Flynn Rd, Camarillo, CA, 93012]

Voice:[+1-805-480-2196], FAX: [+1-805-498-3804], E-Mail:[[email protected]]

Re: []

Abstract: []

Purpose: [To assist with comment resolution for LB #59 for MR-FSK Radio Specifications]

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.

Steve Jillings, Semtech


Consideration of mr fsk radio specification comments

Consideration of MR-FSK Radio Specification Comments Area Networks (WPANs)

Steve Jillings, Semtech


Receiver jamming resistance
Receiver Jamming Resistance Area Networks (WPANs)

  • 6.12a.4.3

    • The adjacent channel rejection shall be measured as follows: the desired signal shall be a compliant MR-FSK PHY signal... of pseudo-random data at the center frequency of the desired channel. The desired signal is input to the receiver at a level 3 dB above the receiver sensitivity...

    • In either the adjacent or the alternate channel, an un-modulated carrier in the center of that channel is input at the level specified...

    • The adjacent channel rejection shall be greater or equal to 10 dB

    • The alternate channel rejection shall be greater or equal to 30 dB

Steve Jillings, Semtech


Receiver jamming resistance1
Receiver Jamming Resistance Area Networks (WPANs)

  • 951/r1 (Le Khanh)

    • Recommendation is to change the interfering signal in the adjacent channel to a modulated signal to achieve a more realistic evaluation of the receiver performance

    • The adjacent channel rejection shall be greater or equal to 10 dB

    • The alternate channel rejection shall be greater or equal to 30 dB

    • The interfering signal should be MR-FSK compliant…

Steve Jillings, Semtech


Receiver jamming resistance2
Receiver Jamming Resistance Area Networks (WPANs)

  • GFSK BT = 1.0 is MR-FSK Compliant

Steve Jillings, Semtech


Receiver jamming resistance3
Receiver Jamming Resistance Area Networks (WPANs)

  • “Filtered FSK” is also MR-FSK Compliant

Steve Jillings, Semtech


Receiver jamming resistance4
Receiver Jamming Resistance Area Networks (WPANs)

  • GFSK Adjacent Channel Interferer

Steve Jillings, Semtech


Receiver jamming resistance5
Receiver Jamming Resistance Area Networks (WPANs)

  • “Filtered FSK” Adjacent Channel Interferer

Steve Jillings, Semtech


Receiver jamming resistance6
Receiver Jamming Resistance Area Networks (WPANs)

  • The spectral characteristics of the unwanted signal depend upon the FSK “filtering” mechanism

  • No easy method to provide a true figure of merit comparison of receiver jamming resistance if the characteristics of the unwanted signal is not accurately defined

  • Use a well defined signal to represent the jamming signal

  • An un-modulated carrier is well defined and provides for an easy comparison of the relative merits of the receiver’s linear interference characteristics

Steve Jillings, Semtech


Receiver jamming resistance7
Receiver Jamming Resistance Area Networks (WPANs)

  • CID #465

    • The ACR numbers for the MR-FSK PHY are too stringent. Use 0 dB for the adjacent channel and 10 dB for the alternate

  • 958/r0 (Popa, Van Wyk)

    • Proposal: A/P

    • The values for adjacent channel rejection have been discussed during many occasions and technical (face to face and call) meetings. TG4g experts have been involved in these discussions

    • Values in the draft are the the results of these discussions

    • No change required (in the standard)

Steve Jillings, Semtech


Transmit spectral mask
Transmit Spectral Mask Area Networks (WPANs)

  • 6.12a.4.1

    • The transmit spectral content is defined as the ratio of the total transmitted out-of-channel power in a given frequency interval, compared to the total transmitted in-channel power in the same frequency interval

    • In-channel and out-of-channel power shall be measured using a frequency interval equal to 1.5 R, where R is the symbol rate, expressed in units of hertz

    • Out-of-channel power shall be measured at the offset frequencies M1 = 1.5×R×(1+h) and M2 = 3×R×(1+h), where h is the modulation index for 2-level modulation and 3×the modulation index for 4-level modulation.

    • The transmit spectral content at M1 and M2 shall be less than –25 dB and –35 dB, respectively.

    • The modulated signal shall use a PN data pattern.

    • The spectrum analyzer settings for this measurement shall be as follows: the resolution bandwidth is 1 kHz, the video bandwidth is 1 kHz or greater and the detector is RMS.

    • In addition, a SUN device shall also satisfy regulatory requirements applicable to the transmit spectral mask

Steve Jillings, Semtech


Transmit spectral mask1
Transmit Spectral Mask Area Networks (WPANs)

  • Case BR = 50 kb/s, h = 1, channel spacing = 200 kHz

    • R = 25 kHz

    • M1 = 1.5*R*(1+h) = 1.5*25*(1+1) = ±75 kHz

    • M2 = 3*R*(1+h) = 3*25*(1+1) = ±150 kHz

  • Case BR = 200 kb/s, h = 0.5, channel spacing = 400 kHz

    • R = 100 kHz

    • M1 = 1.5*R*(1+h) = 1.5*100*(1+0.5) = ±225 kHz

    • M2 = 3*R*(1+h) = 3*100*(1+0.5) = ±450 kHz

  • Case BR = 200 kb/s, h = 0.5, channel spacing = 400 kHz

  • Regulatory requirements in both the EU and Japan ISM bands are more stringent than proposed standard

  • N.A. ISM Band?

    • FCC Test Methodology (DA 00-705 "Filing and Measurement Guidelines for Frequency Hopping Spread Spectrum Systems“)

    • Similar rules for Industry / Industrie Canada…

Steve Jillings, Semtech


Transmit spectral mask2
Transmit Spectral Mask Area Networks (WPANs)

  • Case BR = 50 kb/s, h = 1, channel spacing = 200 kHz

    • R = 25 kHz

    • M1 = 1.5*R*(1+h) = 1.5*25*(1+1) = ±75 kHz

    • M2 = 3*R*(1+h) = 3*25*(1+1) = ±150 kHz

FCC Spectral Mask

15.4g Spectral Mask

< 5 dB Margin to FCC Limits

> 10 dB Margin to 15.4g Mask

Steve Jillings, Semtech


Transmit spectral mask3
Transmit Spectral Mask Area Networks (WPANs)

  • Case BR = 200 kb/s, h = 0.5, channel spacing = 400 kHz

    • R = 100 kHz

    • M1 = 1.5*R*(1+h) = 1.5*100*(1+0.5) = ±225 kHz

    • M2 = 3*R*(1+h) = 3*100*(1+0.5) = ±450 kHz

FCC Spectral Mask

15.4g Spectral Mask

20 dB Margin to 15.4g Mask

< 15 dB Margin to FCC Limits

Steve Jillings, Semtech


Transmit spectral mask4
Transmit Spectral Mask Area Networks (WPANs)

  • Proposal

  • Amend 6.12a.4.1 to read:

  • A SUN device shall satisfy all regulatory requirements applicable to the transmit spectral mask

Steve Jillings, Semtech


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