1. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
January, 2007
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [High rate OFDM system for 60 GHz WPAN]
Date Submitted: [January 2007]
Source: [P. Pagani, I. Siaud, A.M. Ulmer-Moll, W. Li] Company [France Telecom Research and Development Division]
Address [4 rue du Clos Courtel, BP 91226, F Cesson Sévigné, France]
Voice:[], FAX: [],
[{pascal.pagani ; isabelle.siaud ; annemarie.ulmermoll ;
Re: []
Abstract: []
Purpose: [Contribution to IEEE c Task Group]
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
France Telecom
France Telecom

2. High rate OFDM system for 60 GHz WPAN
<month year>
doc.: IEEE <doc#>
January, 2007
High rate OFDM system for 60 GHz WPAN
Pascal Pagani, Isabelle Siaud, Anne-Marie Ulmer-Moll, Wei Li
France Telecom Research and Development Division
France Telecom
France Telecom

3. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
January, 2007
Outline
Motivation
Application scenarios
OFDM system and PHY parameters
Technical features
Preliminary simulation results
Conclusion
France Telecom
France Telecom

4. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
January, 2007
Motivation
Large amount of available spectrum in the millimeter wave frequency band, alleviating interference and coexistence issues
IEEE c Task Group currently studying possible solutions for High Data Rate WPANs operating at 60 GHz
High data rate WPAN distribution among appealing applications: a robust and adapted system design is necessary
This contribution presents a complete high data rate system for 60 GHz WPAN applications, based on OFDM
Proposal built on 60 GHz UWB-MC PHY layer developed within the IST MAGNET project [1], derived from ECMA-368 standard [2]
Features over 2 Gbps data transmission [3], compatibility with existing UWB systems and flexible multiple access scheme
France Telecom
France Telecom

5. Application scenarios
<month year>
doc.: IEEE <doc#>
January, 2007
LiveBox
home gateway
Application scenarios
High data rate WPAN distribution
Multiple user high rate networking
Home or office video streaming
Express file transfer
Environments
Indoor environments (Residential / Office / Library)
Hot spots
Potential nomadic mode within coverage area
Cell mode coverage
Envisioned usage requires radio coverage within one (or more) rooms
Antennas with wide beamwidth are preferred (30° to 60° beamwidth)
Robust modulation scheme required to deal with channel distortion and related ISI
France Telecom
France Telecom

6. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
January, 2007
OFDM based design
Inherently robust to severe channel conditions
Effective ISI mitigation through Cyclic Prefix or Zero Padded suffix
Simple one-tap equalization
Low complexity implementation using FFT
Mature, widely used technology (WiFi, WiMax, DAB, DVB, ECMA UWB)
France Telecom
France Telecom

7. Backward compatibility
<month year>
doc.: IEEE <doc#>
January, 2007
Backward compatibility
Unit bandwidth of 528 MHz selected to ensure backward compatibility with the existing ECMA-368 WPAN standard
Frequency (GHz)
Single band
Dual band
528 MHz
Possibility to provide dual mode devices with a simple baseband reconfiguration
Concept already proposed and assessed within the IST Broadway project [4]
France Telecom
France Telecom

8. PHY parameters overview
<month year>
doc.: IEEE <doc#>
January, 2007
PHY parameters overview
Parameter
Single band mode
Dual band mode
RF bandwidth
528 MHz
1056 MHz
Number of subcarriers
512
1024
Data subcarriers (possibly including pilots)
496
992
Subcarrier spacing
MHz
Guard time
178 ns (CP or ZP)
FFT period
970 ns
Effective symbol duration
1048 ns
Modulation
QPSK, 16-QAM
Channel coding, rate
Convolutional code, K = 7, R = {½, 5/8, 2/3, ¾, 5/6}
Interleaver
Turbo-based interleaver over 6 OFDM symbols
France Telecom
France Telecom

9. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
January, 2007
Example data rates
OFDM Data rate (Mbps)
Code Rate
Single band mode
Dual band mode
QPSK
16QAM
1/3
242
484
968
1/2
367
733
1466
5/8
458
916
1833
2/3
489
977
1955
3/4
550
1100
2200
5/6
611
1222
2443
A wide range of data rates available, up to more than 2.4 Gbps
Selection of optimum modes of operation through simulations
France Telecom
France Telecom

10. Additional technical features
<month year>
doc.: IEEE <doc#>
January, 2007
Additional technical features
Advanced turbo-based interleaving [5, 6]
Two-stage interleaver: binary stage and sub-carrier stage
Flexible adaptive interleaving algorithm with turbo-based Tx structure
Time variant interleaving rule at the sub-carrier stage
Designed for an optimum exploitation of multipath diversity
Channel estimation
Scattered pilots: channel assessed for each OFDM symbol
Preamble symbol: a complete OFDM symbol used for channel estimation
Preamble acceptable due to the low channel time variability
France Telecom
France Telecom

11. Multiple user access and flexible data rates
<month year>
doc.: IEEE <doc#>
January, 2007
Multiple user access and flexible data rates
MC-SS-MA component as a possible candidate
A dedicated spreading code assigned to each user
Provides high bit rate granularity and flexibility
Increased robustness to channel impairments (tone notches)
Concept proposed and developed within the IST Magnet project [7] +
OFDM modulation
Multipath channel
AWGN
S/P
Tcp Insertion X
spreading .
Data
symbol
guard tones
code
time
frequency
Pilot insertion
MC-CDMA transmission
MC-SS-MA transmission
France Telecom
France Telecom

12. Multiple user access and flexible data rates
<month year>
doc.: IEEE <doc#>
January, 2007
Multiple user access and flexible data rates
Preamble
OFDM
Spreading
Frequency Spreading Block
Physical Layer Fragment
frequency
time
code …
Mixed TDMA and MC-SS-MA access schemes
Lc code length Lc={8,16, …}
MC-SS Data rate (Mbps)
n={1, …Lc} (Lc=16)
Code Rate
Single band mode
Dual band mode
QPSK
16QAM
1/3
15.12 n
30.25 n
60.5 n
1/2
22.93 n
45.81 n
45.82 n
91.63 n
5/8
28.63 n
57.25 n n
2/3
30.56 n
61.06 n n
3/4
34.37 n
68.75 n
137.5 n
5/6
38.19 n
76.37 n n
France Telecom
France Telecom

13. Preliminary simulation results
<month year>
doc.: IEEE <doc#>
January, 2007
Preliminary simulation results
TG3c channel models (Matlab code r0p85)
Office LOS (CM3.2), Office NLOS (CM4)
Library LOS (CM5), Library NLOS (CM6)
No spatial filtering applied
Simulation scenario
64 packets (payload 2048 bytes) for 100 different channel realizations (a total of about 108 transmitted bits)
Other simulation assumptions
No phase noise
No amplifier distortion
Perfect channel estimation (using a preamble OFDM symbol)
France Telecom
France Telecom

14. Preliminary simulation results
<month year>
doc.: IEEE <doc#>
January, 2007
Preliminary simulation results
Parameter
Value
RF bandwidth
1056 MHz
Number of subcarriers
1024
Data subcarriers
992
Guard time
178 ns (CP)
Modulation
16-QAM
Channel coding, rate
Convolutional code, R = 2/3
Interleaver
Turbo-based interleaver
Channel models tested
CM3.2, CM4, CM5, CM6
Data rate
1955 Mbps
France Telecom
France Telecom

15. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
January, 2007
Conclusion
Millimeter wave frequency band envisioned for high data rate WPAN systems
Multi-user high data rate distribution and networking seen as a key application in home / office environments
OFDM based system design presented, featuring
Wide range of available data rates up to over 2.4 Gbps
Backward compatibility with existing lower band WPAN standards
Robust modulation scheme for cell mode coverage
Advanced turbo-based interleaving
Possible flexible multi-user management using MC-SS-MA techniques
Simulation results show system robustness in multipath channel
Further study: inclusion of phase noise and amplifier impairments
France Telecom
France Telecom

16. January, 2007
References
[1] IST MAGNET Project, Update D3.2.2a “Candidate Air Interfaces and Enhancements” IST , My personal Adaptive Global Net, deliverable D3.2.2b, Dec. 2005,
[2] Standard ECMA-368, "High Rate Ultra Wideband PHY and MAC Standard", 1st Edition – Dec. 2005,
[3] Sadri, A., et al., " c Usage Model Document", IEEE Working Group for WPAN, no. IEEE c, January 2006.
[4] IST Broadway Project, "Architecture Proposal for RF Front End with special requirements on dual 60 GHz and 5 GHz solutions", deliverable WP4 - D4, Aug
[5] Siaud, .I & Ulmer-Moll, A.M, "A novel adaptive sub-carrier Interleaving application to millimeter-wave WPAN OFDM Systems" (IST MAGNET project), accepted to IEEE Portable 2007 Conf., to be published in March 2007.
[6] Cassiau, N., Siaud, I., Ulmer-Moll, A.M, Hunziker, T. & Schoo, K., "Coexistence Aspects of the MAGNET PAN-optimized Air Interface Targeting High Data Rates", WWRF#17, Helsinki, Nov
[7] Fazel, S., Cassiau, N., Siaud, I., Ulmer-Moll, A.M., Hunziker, T. & Westmeier, M., "Advanced algorithms for link level simulations of the MC-SS air-interface", IST MAGNET Beyond Project, deliverable IR 3.2.1, Dec
France Telecom

17. Thank you ! Questions ? pascal.pagani@orange-ftgroup.com
January, 2007
Thank you ! Questions ?
France Telecom