1. doc.: IEEE 15-08-0797-00-004d Submission November 2008 M. Schmidt and F. Poegel, AtmelSlide 1 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: Receiver Jamming Resistance for Japanese 950 MHz Low Power Active Radio Systems Date Submitted: November 11th, 2008 Source: Michael Schmidt and Frank Poegel, Atmel Contact: Michael Schmidt, michael.schmidt@atmel.com Voice: +49 351 6523 436 Re: Abstract:Technical requirements on the receiver jamming resistance for 950 MHz low power radio systems. Purpose: To encourage discussion. 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.

2. doc.: IEEE 15-08-0797-00-004d Submission November 2008 M. Schmidt and F. Poegel, AtmelSlide 2 Receiver Jamming Resistance for Japanese 950 MHz Low Power Active Radio Systems Michael Schmidt and Frank Poegel Atmel

3. doc.: IEEE 15-08-0797-00-004d Submission November 2008 M. Schmidt and F. Poegel, AtmelSlide 3 Problem Requirements on the Receiver Jamming Resistance as specified in P802.15.4d/D2 are presumably too stringent.

4. doc.: IEEE 15-08-0797-00-004d Submission November 2008 M. Schmidt and F. Poegel, AtmelSlide 4 Alternate Channel Rejection IEEE-802.15.4-2006 @ 915 MHz channel spacing: 2 MHz IEEE P802.15.4d/D2 channel spacing: 0.4 MHz GFSK 0.6 MHz BPSK

5. doc.: IEEE 15-08-0797-00-004d Submission November 2008 M. Schmidt and F. Poegel, AtmelSlide 5 RX-Filter Attenuation (3-rd order Butterworth)

6. doc.: IEEE 15-08-0797-00-004d Submission November 2008 M. Schmidt and F. Poegel, AtmelSlide 6 Ω c [MHz] (cut-off) dΩ AAC / Ω c BW-3rd-order attenuation O-QPSK-250-kbit/s @915MHz0.66.549 BPSK-40-kbit/s @915 MHz0.66.549 GFSK-100-kbit/s @950 MHz0.2436 BPSK-20-kbit/s @950 MHz0.3436 RX-Filter Attenuation (3r-order Butterworth)

7. doc.: IEEE 15-08-0797-00-004d Submission November 2008 M. Schmidt and F. Poegel, AtmelSlide 7 Based on a 3-rd order Butterworth filter, the relative attenuation loss is approx 13 dB Counteract by: –Decrease the cut-off frequency: Prone to filter tuning Hard to implement for low-IF receiver architectures –Increased filter order: Additional die size Increased power consumption –Relax minimum receiver jamming resistance by approx 10 …15 dB RX-Filter Attenuation (3rd-order Butterworth)

8. doc.: IEEE 15-08-0797-00-004d Submission November 2008 M. Schmidt and F. Poegel, AtmelSlide 8 Attenuation will further degrade due to: Frequency offset Tolerances regarding filter tuning Allow sufficient design margin! RX-Filter Attenuation (3rd-order Butterworth)

9. doc.: IEEE 15-08-0797-00-004d Submission November 2008 M. Schmidt and F. Poegel, AtmelSlide 9 Suggested Requirements BPSK-20-kbit/s @ 950 MHz –Lower SNR required compared to GFSK-PHY. Adjacent channel rejection Alternate channel rejection 0 dB20 dB GFSK-100-kbit/s @ 950MHz –Higher SNR required compared to BPSK-PHY. –It is desirable to use a common receive filter for both PHYs, BPSK and GFSK. Adjacent channel rejection Alternate channel rejection 0 dB10..15 dB