1. OFDM High Rate Extension Zyren, Webster, Halford
doc.: IEEE /282
May 2001
May 2001
OFDM High Rate Extension Zyren, Webster, Halford
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Zyren, Webster, Halford Intersil
Zyren, Halford, Webster Intersil

2. 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 a 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

3. 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 a
Standard compliant system using a option requires CCK and OFDM capability
PBCC-22
Mandatory portion uses PBCC as a high rate extension
Standard compliant system using a option requires CCK, PBCC, and OFDM.
Zyren, Webster, Halford Intersil

4. 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 2.4 GHz have been removed
OFDM & PBCC on the same regulatory footing
Zyren, Webster, Halford Intersil

5. 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

6. 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 b
Provides optional mode which is a 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