OFDM High Rate Extension Zyren, Webster, Halford doc.: IEEE 802.11-01/282 May 2001 May 2001 OFDM High Rate Extension Zyren, Webster, Halford This Style Guide is designed to facilitate the creation of presentations within Intersil graphic guidelines. These presentations may address an external audience, as in a product announcement or industry event, or an internal one, as in seminars or executive committee meetings. In any case, it is important to adhere to a corporate Style Guide. The Style Guide provides standards and guidelines to help project Intersil’s corporate identity. Projecting visual continuity is a key to the success of the company. The Style Guide is based on the capabilities of Microsoft PowerPoint, one of our corporate standard software packages. The following slides and script describe the graphic standards and guidelines for these presentations. This Style Guide will address four key areas: The overall Layout and Design Specifications for placement of text, logo, and graphic treatments (symbols, bar charts and table charts) Recommended Guidelines for using photography and illustration Recommended Color usage and standard palette Zyren, Webster, Halford Intersil Zyren, Halford, Webster Intersil

Why OFDM in the 2.4 GHz Band? Convergence Performance May 2001 Why OFDM in the 2.4 GHz Band? Convergence OFDM is already used at 5 GHz Independently selected by IEEE 802.11a and HiperLAN2 Performance OFDM is a powerful and proven method OFDM provides excellent performance in multipath and AWGN interleaving and error coding result in extremely robust systems Zyren, Webster, Halford Intersil

What about complexity? CCK/OFDM PBCC-22 May 2001 What about complexity? CCK/OFDM Mandatory part uses OFDM as a high rate extension Optional mode is 802.11a Standard compliant system using 802.11a option requires CCK and OFDM capability PBCC-22 Mandatory portion uses PBCC as a high rate extension Standard compliant system using 802.11a option requires CCK, PBCC, and OFDM. Zyren, Webster, Halford Intersil

FCC Further Notice OFDM is approved for use in the 2.4 GHz ISM band May 2001 FCC Further Notice OFDM is approved for use in the 2.4 GHz ISM band Regulatory barriers to use of OFDM @ 2.4 GHz have been removed OFDM & PBCC on the same regulatory footing Zyren, Webster, Halford Intersil

May 2001 Migration Path We need CCK for backward compatibility with 11 Mbps systems We need OFDM for forward migration to 54 Mbps Do we need a third PHY just to do 22 Mbps? How will we handle higher PBCC rates (PBCC-33)? CCK/OFDM is a far less complex means of bringing OFDM into the band Zyren, Webster, Halford Intersil

Conclusions CCK / OFDM is a cleaner migration path May 2001 Conclusions CCK / OFDM is a cleaner migration path Provides mandatory backward compatible mode using OFDM as a high rate extension to 802.11b Provides optional mode which is 802.11a compliant Avoids market confusion that will result from introduction of a 3rd PHY Additional PBCC date rates will add to confusion CCK / OFDM is the right choice for TGg Zyren, Webster, Halford Intersil