Siemens IEEE802.11 Manual de usuario Pagina 20

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, © Siemens, 2002
AMPLITUDE
FREQUENCY
TIME
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Frequency Hopping Spread Spectrum
n 2.4GHz band is 83.5MHz wide (US & Europe)
n Band is divided into at least 75 channels
n Each channel is < 1MHz wide
n Transmitters and receivers hop in unison among
channels in a pseudo random manner
n Power must be filtered to -20db at band edge
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