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

1. July, 2009 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title:FPP-SUN: Performance Results of Option 1 in Scalable OFDM PHY. Date Submitted: July, 2009 Source: Sangsung Choi & Cheolho Shin Electronics and Telecommunications Research Institute(ETRI) Voice: +82 42 860 6722, +82 42 860 6831 Fax: +82 42 860 5218 E-maill: sschoi@etri.re.kr, chshin@etri.re.kr Re: IEEE 802.15 Task Group 4g Call for Proposals (CFP) on 22 January, 2009 Abstract: This presentation summarizes the performance results of the Option 1. Purpose: Proposal for consideration by the TG4g 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. Slide 1

2. A Future Proof Platform for SUN: Performance Results of Option 1 in Scalable OFDM PHY. July, 2009 IEEE 802 Plenary Session San Francisco July 2009 Supporters: Emmanuel Monnerie [Landis & Gyr], Partha Murali [Redpine], Steve Shearer [Independent], Shusaku Shimada [Yokogawa Electric Co.], Bob Fishette [Trilliant], Rishi Mohindra [MAXIM], Roberto Aiello [Independent], Kendall Smith [Aclara], David Howard [On-Ramp] Sangsung Choi & Cheolho Shin Slide 2

3. Overview of FPP OFDM PHY Proposal Overview of FPP OFDM Proposal Option-1 SUN Channel Using TV White Space Tx Model for Scalable OFDM PHY Channel Model Used Simulation Results - AWGN Simulation Results - Multipath Simulation summary and Link Margin Calculations Conclusion Outline July, 2009 Slide 3

4. Overview of FPP OFDM PHY Proposal July, 2009 • The Merged OFDM PHY proposal for Future Proof Platform • has 5 option modes according to signal bandwidth. • The Performance of Future Proof OFDM Proposal Option-1 • is simulated in ETRI Slide 4

5. Overview of FPP OFDM Proposal Option-1 July, 2009 • Frequency: TV white space • UHF (CH 14 ~ CH 51) : 512 - 608MHz / 614-698MHz • TX power limit: 20 dBm (assume) • Modulation • - OFDM/BPSK or QPSK • Data rates: 98/195/391/781 kbps • Convolutional encoder • - constraint length 7, ½ rate code • - generator polynomials G1,2 = [133, 171] • Interleaving • - i = (Ncbps/20)(k mod 20) + floor(k/20), k = 0, 1, 2, … Ncbps -1 • - Ncbps = 100(BPSK), 200(QPSK) • 128 IFFT/FFT Slide 5

6. Example: SUN Channel Using TV White Space July, 2009 • Can use 4 SUN Channels per 1 TV Channel • Can configure 4 piconets simultaneously. Slide 6

7. Tx Model for Simulation July, 2009 Slide 7

8. July, 2009 Tx Model for Simulation - Continued Interleaving - i = (Ncbps/20)(k mod 20) + floor(k/20), k = 0, 1, 2, … Ncbps -1 - Ncbps = 100(BPSK), 200(QPSK) Slide 8

9. Data rates in Option 1 July, 2009 Tx Model for Simulation - Continued • FDS: Frequency-Domain Spreading • TDS: Time-Domain Spreading Slide 9

10. Timing-related parameter July, 2009 Tx Model for Simulation - Continued Slide 10

11. Structure of OFDM Symbol July, 2009 Tx Model for Simulation - Continued Slide 11

12. packet structure July, 2009 Tx Model for Simulation - Continued STF(16*20) LTF(160*2) Preamble Header Slide 12

13. FDS: Frequency-Domain Spreading TDS: Time-Domain Spreading July, 2009 Tx Model for Simulation - Continued Slide 13

14. 128 IFFT July, 2009 Tx Model for Simulation - Continued • Total of 128 tones: • 100 data tones used to transmit information • (constellation: BPSK/QPSK). • - 8 pilot tones used for carrier and phase tracking. • - Remaining 20 tones including DC are NULL tones. Slide 14

15. Channel Model for Simulation July, 2009 Slide 15

16. Simulation Results – AWGN July, 2009 AWGN Channel Slide 16

17. Simulation Results – Typical Urban July, 2009 Frequency Selective Channel • Frequency Selective Channel depends on relative power and relative delay. • relative delay : 5 • relative power : -22.3 • . Slide 17

18. Simulation Results – Bad Urban July, 2009 Frequency Selective Channel relative delay : 5 relative power : -3 Slide 18

19. Simulation Results – Hilly Terrain July, 2009 Frequency Selective Channel relative delay : 15 relative power : -8.6 Slide 19

20. Summary of Simulation Results July, 2009 • Use 1,000 Packets for simulation • SNRs for 10% Packet Error Rate • Channel Models used are from ETSI EN 300 392-2 v3.2.1 • -> just focus on effects of multipath reflections in these simulations. Slide 20

21. Link Margin Calculations July, 2009 • TX Power: 20dBm • Noise floor: -114 dBm/MHz * 10*log(1.25MHz) = -113dBm • 4 dB noise figure & implementation loss (Assumed) • Link Margin(dB) = TX Power – (Noise floor + required SNR + (NF + IL)) Slide 21

22. Conclusion July, 2009 • Multipath reflections make the frequency selective channel. • - Channel Models taken from ETSI ETSI EN 300 392-2 V3.2.1 • The simulation results of FPP OFDM Proposal Option-1 for SUN show the robustness of OFDM method against the multipath • reflections. • - Superior performance outdoor channels defined in the PAR • - Excellent link margin and efficiency Slide 22