doc.: IEEE 802.15-09-0114-00-004g-Trends-in-SUN-capacity <month year> doc.: IEEE 802.15-09-0114-00-004g-Trends-in-SUN-capacity 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 Emmanuel Monnerie, Landis+Gyr

doc.: IEEE 802.15-<doc# > Sangsung Choi & Cheolho Shin <month year> doc.: IEEE 802.15-<doc# > July, 2009 A Future Proof Platform for SUN: Performance Results of Option 1 in Scalable OFDM PHY. Sangsung Choi & Cheolho Shin 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] Slide 2 <author>, <company>

Outline Overview of FPP OFDM PHY Proposal <month year> doc.: IEEE 802.15-<doc#> July, 2009 Outline 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 Slide 3 Page 3 <author>, <company>

Overview of FPP OFDM PHY Proposal July, 2009 Overview of FPP OFDM PHY Proposal 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

Overview of FPP OFDM Proposal Option-1 July, 2009 Overview of FPP OFDM Proposal Option-1 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

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

Tx Model for Simulation July, 2009 Tx Model for Simulation Slide 7

Tx Model for Simulation - Continued 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

Tx Model for Simulation - Continued July, 2009 Tx Model for Simulation - Continued Data rates in Option 1 Data rate (Kbps) Modulation Coding Rate (R) FDS TDS 98 BPSK 1/2 YES 195 NO 391 No 781 QPSK FDS: Frequency-Domain Spreading TDS: Time-Domain Spreading Slide 9

Tx Model for Simulation - Continued July, 2009 Tx Model for Simulation - Continued Timing-related parameter Parameter Description Value fs Sampling frequency 1250 KHz NFFT FFT Size 128 ∆f Subcarrier frequency spacing 9.765625 KHz TFFT IFFT and FFT period 102.4 us NCP Number of samples in cyclic prefix 32 TCP Cyclic prefix duration in time 25.6 us NSYM Total Number of samples per symbol 160 TSYM Symbol interval 128 us Slide 10

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

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

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

Tx Model for Simulation - Continued July, 2009 Tx Model for Simulation - Continued 128 IFFT 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

Channel Model for Simulation July, 2009 Channel Model for Simulation Channel Models taken from ETSI EN 300 392-2 V3.2.1 (2007-09) Propagation Model Tap Number Relative delay (us) Average relative power (dB) Rural Area (Rax) 1 Typical Urban (Tux)   2 5 -22.3 Bad Urban (Bux) -3 Hilly Terrain (HTx) 15 -8.6 Slide 15

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

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

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

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

Summary of Simulation Results July, 2009 Summary of Simulation Results 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. Data-Rate (Kbps) AWGN 1KByte (dB) Typical Urban 1KByte (dB) Bad Urban 1KByte (dB) Hilly Terrain 1KByte (dB) 781 4.9 6.2 7.3 8.5 391 1.8 3.4 3.8 4.8 195 -0.1 0.8 0.9 1.9 98 -0.2 Slide 20

Link Margin Calculations July, 2009 Link Margin Calculations 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)) Data-Rate (Kbps) AWGN 1KByte (dB) Typical Urban 1KByte (dB) Bad Urban 1KByte (dB) Hilly Terrain 1KByte (dB) 781 124.1 122.8 121.7 120.5 391 127.2 125.6 125.2 124.2 195 129.1 128.2 128.1 127.1 98 129.2 Slide 21

Conclusion Multipath reflections make the frequency selective channel. July, 2009 Conclusion 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