1. doc.: IEEE 802.15-09-0114-00-004g-Trends-in-SUN-capacity
<month year>
doc.: IEEE g-Trends-in-SUN-capacity
July, 2009
Project: IEEE P 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: , Fax: l:
Re: IEEE 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 P 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 P
Slide 1
Emmanuel Monnerie, Landis+Gyr

2. doc.: IEEE 802.15-<doc# > Sangsung Choi & Cheolho Shin
<month year>
doc.: IEEE <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>

3. Outline Overview of FPP OFDM PHY Proposal
<month year>
doc.: IEEE <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>

4. 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

5. 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) : MHz / MHz
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
Example: SUN Channel Using TV White Space
Can use 4 SUN Channels per 1 TV Channel
Can configure 4 piconets simultaneously.
Slide 6

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

8. 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

9. 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

10. 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
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

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

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

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

14. 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

15. Channel Model for Simulation
July, 2009
Channel Model for Simulation
Channel Models taken from ETSI EN V3.2.1 ( )
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

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

17. 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

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

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

20. 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 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

21. 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

22. 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 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