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Chapter 11. HomeRF > HomeRF 1.0 Physical Layer Attributes

11.2. HomeRF 1.0 Physical Layer Attributes

A HomeRF packet is created by attaching a preamble to the MAC frame and inserting a 4FSK filed between the MAC frame header and the MAC frame body if the 4FSK modulation is utilized. Data whitening, modulation, and frequency-hopping schemes are very similar to those of an IEEE 802.11 FHSS system. A HomeRF transceiver needs an additional voice/telephone interface. Receiver sensitivities are more relaxed resulting in channel capacities that are higher than those in the FHSS system.

11.2.1. Packet Format

The HomeRF packet format is shown in Figure 11.12. A HomeRF packet consists of a preamble, a PSDU1 (PHY Service Data Unit 1), followed by an optional 4FSK Symbol field, and a PSDU2. The HomeRF preamble has a Sync field of 80 bits and a Start Frame Delimiter of 16 bits.


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