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Chapter 10. Wireless Ethernet > Frequency-Hopping Spread Spectrum

10.2. Frequency-Hopping Spread Spectrum

In this section, features of the FHSS wireless Ethernet are highlighted by examining the packet structure, the Gaussian frequency shift keying modulation process, and basics of the frequency-hopping mechanism.

10.2.1. Summary of FHSS Standards

The packet format for the FHSS implementation of wireless Ethernet is shown in Figure 10.12. An FHSS packet consists of a preamble, a header, and a whitened MAC frame. The FHSS preamble has a Sync field of 80 bits and a Start Frame Delimiter of 16 bits. The FHSS header has a PSDU length word (PLW) of 12 bits, a Physical Layer Convergence Protocol (PLCP) signaling field (PSF) of 4 bits, and a header error check (HEC) field of 16 bits, where PLCP stands for physical layer convergence protocol and PSDU stands for PLCP SDU (Service Data Unit). PLCP is a physical layer-dependent function connecting the MAC to a particular transmission mechanism.


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