LB84 PHY Ad-hoc Comment Resolution CID# 690 June 2006 doc.: IEEE 802.11-06/0851r0 June 2006 LB84 PHY Ad-hoc Comment Resolution CID# 690 Date: 2006-09-01 Authors: Notice: This document has been prepared to assist IEEE 802.11. 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 802.11. Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures <http:// 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 <stuart.kerry@philips.com> 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 802.11 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at <patcom@ieee.org>. Jeremy Gosteau Jeremy Gosteau

Advanced space-time coding June 2006 doc.: IEEE 802.11-06/0851r0 June 2006 Advanced space-time coding CID #690 There is one value of the STBC field in the HT-SIG field that is never used which provides the possibility of adding an optional more advanced STBC code for better range and throughput efficiency. Provide a new optional advanced STBC code When NSTS = 2, only full diversity (NSS = 1) or only full rate (NSS = 2) modes can be applied. Proposal: define a set of optional robust transmission rates that are applicable when NSS = 2 and NSTS = 2 with minimum change in Tx chain Selection of the Golden code: full rate full diversity code with non vanishing determinant, that is implemented as an additional STBC Jeremy Gosteau Jeremy Gosteau

June 2006 doc.: IEEE 802.11-06/0851r0 June 2006 The Golden code Construction of the Golden code [1] from a cyclic division algebra: The Golden code achieves the diversity/multiplexing gain tradeoff with minimal code length and non vanishing determinant: good candidate to achieve high data rates [1] J.-C. Belfiore, G. Rekaya, and E. Viterbo, "The Golden Code: A 2 x 2 Full-Rate Space-Time Code with Non-Vanishing Determinants", IEEE Transactions on Information Theory, vol. 51, April 2005. Jeremy Gosteau Jeremy Gosteau

Simulation results for Rayleigh channel June 2006 Comparison of Golden code and dual stream transmission for 2Tx/2Rx: Small gain observed for .11n convolutional code 1.3dB gain provided by the Golden code when concatenated to the less robust [5 7] convolutional code 1.3dB Jeremy Gosteau

Uncoded and coded simulation results for channel TGn D June 2006 Uncoded and coded simulation results for channel TGn D Simulation results for 2x2, QPSK, 20MHz bandwidth 6.8dB gain at PER = 10-2 on uncoded performance using the Golden code But close performance for both Tx schemes in the coded case (R = ½) 6.8dB Coded case Uncoded case Simulation parameters for TGn channels: .11n stream parser, interleaver and constellation mapper Maximum Likelihood detection Jeremy Gosteau

Simulation results for channels Tgn B-D June 2006 Both schemes give close performance for higher data rate (MCS: 12, 78Mbps) in office environment (TGn D) But a small gain (0.3dB) is provided by the Golden code in home environment (TGn B) with less frequency diversity 0.3dB Jeremy Gosteau

June 2006 Conclusion No significant gain on the performance of .11n modes by implementing the Golden code with the constraint to only upgrade the STBC block of .11n Tx chain However a gain could be provided by the Golden code by adapting other Tx blocks such as the interleaver and the mapper To avoid significant change in the current draft, proposed resolution for CID #690  Withdraw Jeremy Gosteau