1. WWiSE IEEE 802.11n Proposal Authors: Date: 2005-03-04
Notice: This document has been prepared to assist IEEE 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 grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE
Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures < ieee802.org/guides/bylaws/sb-bylaws.pdf>, including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE Working Group. If you have questions, contact the IEEE Patent Committee Administrator at
Sean Coffey, Realtek, et al.

2. Additional authors: VK Jones Airgo Networks vkjones@airgonetworks.com
Richard van Nee
Ali Raissinia
Allert van Zelst
Bruce Edwards
Broadcom
Matthew Fischer
Chris Hansen
Tushar Moorti
Chris Young
Takashi Ishidoshiro
Buffalo
Masato Kato
Dave Hedberg
Conexant
Cenk Kose
Jim Petranovich
Sean Coffey, Realtek, et al.

3. Additional authors: Michael Seals Conexant michael.seals@conexant.com
Mark Webster
Menzo Wentink
Taehyun Jeon
ETRI
Sok-kyu Lee
Heejung Yu
Mustafa Eroz
Hughes Network Systems
Lakshmi Iyer
Lin-Nan Lee
Feng-Wen Sun
Marc de Courville
Motorola
Marcus Muck
Alexandre Ribeiro-Dias
Sean Coffey, Realtek, et al.

4. Additional authors: Stephanie Rouquette-Leveil Motorola
Sebastien Simoens
John Chang
Ralink
Sheng Lee
Tom Pare
David Tung
Stephan ten Brink
Realtek
Gabriella Convertino
STMicroelectronics
Mike Moreton
Fabio Osnato
Pratima Pai
Vincenzo Scarpa
Massimiliano Siti
Sean Coffey, Realtek, et al.

5. Additional authors: George Vlantis STMicroelectronics
Anuj Batra
Texas Instruments
Srikanth Gummadi
Dale Hocevar
Richard Williams
Keith Chugg
TrellisWare
Paul Gray
Bob Ward
Jeng-Hong Chen
Winbond Electronics
Pansop Kim
Alfred Lin
Wei-Chung Peng
Sean Coffey, Realtek, et al.

6. Abstract
The presentation summarizes the changes to the WWiSE proposal since the January meeting:
What’s new since last meeting …
New members
Proposal updates
Enhanced single receive antenna modes
Enhanced design for optimal backward compatibility
New LDPC code design
New technical information
Sean Coffey, Realtek, et al.

7. Expanded membership Airgo Networks Broadcom Buffalo Conexant ETRI
Hughes Network Systems
Motorola
Ralink
Realtek
STMicroelectronics
Texas Instruments
TrellisWare
Winbond
The WWiSE and Motorola complete proposals have merged
Sean Coffey, Realtek, et al.

8. Proposal updates Enhanced single-receive-antenna modes
Enhanced design for backward compatibility
New LDPC code design
Beacon enhancement for longer range, low rate
Sean Coffey, Realtek, et al.

9. Enhanced single-receive-antenna modes
Previously the WWiSE proposal had 2x1 space-time block coded modes
Very low complexity
Modular add-on to other modes
The revised proposal extends this mode to 3x1 and 4x1 antenna configurations
This is accomplished by building on the 2x1 modes, cycling the 2 transmit antennas across the array
Very simple
Improves robustness by exploiting all available diversity
Sean Coffey, Realtek, et al.

10. Single-receive-antenna modes, contd.
Single receive antenna modes are of the highest importance for lowest power, lowest cost applications
PHY data rates of up to 135 Mbps are achieved in these 2x1, 3x1, and 4x1 modes
This enables highly robust, ultra-low-cost communication achieving the 100 Mbps throughput mandate
There are no corresponding modes in the other proposal
Sean Coffey, Realtek, et al.

11. Enhanced preamble design
Design of short and long sequences in mixed mode have been modified
Same general format, with new cyclic shifts
Revised version uses a 200 ns cyclic advance instead of 400 ns cyclic delay for 2 Tx antennas mixed mode
Same cyclic shifts apply to long sequence and SIG-N field
Improves performance of cross-correlation detectors
Sean Coffey, Realtek, et al.

12. Enhanced preamble design, contd.
New technical information (separate presentation): effect of revised WWiSE preamble on legacy equipment from expanded set of vendors:
Atheros
Broadcom
Conexant
Intel
Marvell
Texas Instruments
Comparison to effect of TGnSync preamble and original WWiSE preamble
Sean Coffey, Realtek, et al.

13. New LDPC code design
New design is regularly structured, supports fast convergence and parallel memory accesses
Supports layered belief propagation
Improved performance
See separate presentation for comparison of WWiSE and TGnSync performances at all code rates, and 12 and 50 iterations
WWiSE performance always equivalent or better than TGnSync design at each rate and number of iterations considered
Sean Coffey, Realtek, et al.

14. Beacon enhancement n-beacon added SIG-N field repeated
Brings advantages of 2x1, 3x1, and 4x1 modes to maximum range
I.e., 6 Mbps modes have SIGNAL field of required robustness
New beacon is optional, due to optionality of 2x1, 3x1, and 4x1 modes
Sean Coffey, Realtek, et al.

15. References and further information
IEEE / n, “WWiSE group PHY and MAC specification,” C. Kose, B. Edwards, et al.
IEEE / n, “WWiSE proposal response to functional requirements and comparison criteria,” C. Hansen, M. Fischer, et al.
IEEE / r3-000n and –r4-000n, IEEE / r3, “WWiSE complete proposal presentation,” S. Coffey et al.
IEEE / n, “WWiSE MAC proposal for TGn,” M. Fischer, et al.
See also
Or send to
Sean Coffey, Realtek, et al.