2.4 GHz Frequence Band– IEEE 802.11b

• 2 different types of layer 1 physical interfaces

  • Frequency-hopping architecture
  • Direct-sequencing architecture (single-frequency approach) DSSS

• Frequency Hopping

  • 2.4 GHz ISM band provides 83.5 MHz of available frequency spectrum
  • frequency-hopping-architecture: transmit radio on 1 of 79x 1-MHz-wide frequencies (channel) for max. 0.4 sec
  • ? interference tolerant network
  • one channel stumbles across an interference => because frequency-hopping data retransmission is realized on another frequency
  • achievable data rate: 2 Mbps

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