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

1. 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:[sjillings@semtech.com] 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

2. Consideration of MR-FSK Radio Specification Comments Steve Jillings, Semtech

3. Receiver Jamming Resistance • 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

4. Receiver Jamming Resistance • 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

5. Receiver Jamming Resistance • GFSK BT = 1.0 is MR-FSK Compliant Steve Jillings, Semtech

6. Receiver Jamming Resistance • “Filtered FSK” is also MR-FSK Compliant Steve Jillings, Semtech

7. Receiver Jamming Resistance • GFSK Adjacent Channel Interferer Steve Jillings, Semtech

8. Receiver Jamming Resistance • “Filtered FSK” Adjacent Channel Interferer Steve Jillings, Semtech

9. Receiver Jamming Resistance • 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

10. Receiver Jamming Resistance • 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

11. Transmit Spectral Mask • 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

12. Transmit Spectral Mask • 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

13. Transmit Spectral Mask • 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

14. Transmit Spectral Mask • 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

15. Transmit Spectral Mask • 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