Siemens IEEE802.11 Manual de usuario Pagina 19

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WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 19 © Siemens, 2002
IEEE802.11
2.4 GHz & 5 GHz Physical Layers
Time
Frequency
n 2.4 GHz
Frequency Hopping Spread Spectrum
2/4 FSK with 1/2 Mbps
79 non overlapping frequencies
of 1 MHz width (US)
Frequency
Power
Frequency
Power
spreading
n 2.4 GHz
Direct Sequence Spread Spectrum
DBPSK/DQPSK with 1/2 Mbps
Spreading with 11 Bit barker Code
11/13 channels in the 2.4 GHz band
n 2.4 GHz High Rate DSSS Ext. (802.11b)
CCK/DQPSK with 5.5/11 Mbps
Frequency
Power
n 5 GHz
OFDM
PHY (802.11a)
Basic parameters identical to
HiperLAN2 PHY
European regulatory issues
n
Baseband IR, 1 and 2Mbps, 16-PPM and 4-PPM
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