Jung Yee, IceFyre Semiconductor January 2002 doc.: IEEE 802.11-02/064r0 January 2002 802.11g PAR issues with D1.1 Jung Yee, IceFyre Semiconductor Jung Yee, IceFyre Semiconductor Jung Yee, IceFyre Semiconductor

January 2002 doc.: IEEE 802.11-02/064r0 January 2002 802.11g PAR From document 802.11-00/114r3 Purpose: To develop a new PHY extension to enhance the performance and the possible applications of the 802.11b compatible networks by increasing the data rate achievable by such devices Section 12: The new proposed 802.11b extension shall be interoperable with the existing 802.11b standard that operates in the 2.4GHz band. Section 16: The new extension shall implement all mandatory portions of the IEEE 802.11b PHY standard. Jung Yee, IceFyre Semiconductor Jung Yee, IceFyre Semiconductor

Spectral Mask Comparison January 2002 doc.: IEEE 802.11-02/064r0 January 2002 Spectral Mask Comparison 802.11b 802.11a Jung Yee, IceFyre Semiconductor Jung Yee, IceFyre Semiconductor

Spectral Mask Analysis January 2002 doc.: IEEE 802.11-02/064r0 January 2002 Spectral Mask Analysis Downbanded 802.11a signal will violate 2.4-2.4835 GHz emissions limits Jung Yee, IceFyre Semiconductor Jung Yee, IceFyre Semiconductor

Interference Analysis January 2002 doc.: IEEE 802.11-02/064r0 January 2002 Interference Analysis 802.11g and 802.11b systems will both experience Co-Channel Interference (CCI) Jung Yee, IceFyre Semiconductor Jung Yee, IceFyre Semiconductor

Interference Analysis contd January 2002 doc.: IEEE 802.11-02/064r0 January 2002 Interference Analysis contd From document 802.11-00/142, slide “Loss in SNR with SIR=10dB” 802.11g systems will degrade existing 802.11b systems 802.11g systems will have poor performance Signal Barker-2 CCK-11 PBCC-11 PBCC-22 OFDM-24 Interferer 2.5 dB 2.6 dB 1.2 dB 3.3 dB 5.6 dB 0.6 dB 2.7 dB 3.2 dB 5.9 dB 1.1 dB 5.7 dB BT 0.0 dB 1.9 dB 0.5 dB N/A 0.7 dB 4.2 dB 1.3 dB 5.0 dB >8.0 dB Jung Yee, IceFyre Semiconductor Jung Yee, IceFyre Semiconductor

January 2002 doc.: IEEE 802.11-02/064r0 January 2002 ESS considerations No provisions for roaming between an 802.11b AP and and 802.11g AP No provisions for STA modulation mode changes while roaming in an 802.11g system QoS cannot be preserved while roaming Jung Yee, IceFyre Semiconductor Jung Yee, IceFyre Semiconductor

IBSS considerations 802.11b CCA will not detect OFDM short symbol January 2002 doc.: IEEE 802.11-02/064r0 January 2002 IBSS considerations 802.11b CCA will not detect OFDM short symbol 802.b STA performance degraded in the presence of 802.11g STA Jung Yee, IceFyre Semiconductor Jung Yee, IceFyre Semiconductor

BSS considerations 802.11g AP must support all modulation modes January 2002 doc.: IEEE 802.11-02/064r0 January 2002 BSS considerations 802.11g AP must support all modulation modes OFDM has longer processing delay than CCK QoS (delay, jitter) violated by mix-mode operation Jung Yee, IceFyre Semiconductor Jung Yee, IceFyre Semiconductor

January 2002 doc.: IEEE 802.11-02/064r0 January 2002 802.11g-D1.1 violates PAR 802.11g violates emissions restrictions in the 2.4-2.483 GHz band 802.11b networks degraded by 802.11g networks 802.11g networks will have poor performance Standalone cells will see improved performance The draft will not ensure 802.11e QoS functionality (MAC violation) Jung Yee, IceFyre Semiconductor Jung Yee, IceFyre Semiconductor