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 ...
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