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Chapter 6

Bandwidth Utilization:

Multiplexing and

Spreading

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6-1 6-1 SPREADSPREAD SPECTRUMSPECTRUM

In spread spectrum (SS), we combine signals from In spread spectrum (SS), we combine signals from

different sources to fit into a larger bandwidth, but our different sources to fit into a larger bandwidth, but our

goals are to prevent eavesdropping and jamming. To goals are to prevent eavesdropping and jamming. To

achieve these goals, spread spectrum techniques add achieve these goals, spread spectrum techniques add

redundancy. redundancy.

 Frequency Hopping Spread Spectrum (FHSS)

 Direct Sequence Spread Spectrum (DSSS)

Topics discussed in this section: Topics discussed in this section:

Figure 6.27 Spread spectrum

Figure 6.28 Frequency hopping spread spectrum (FHSS)

Figure 6.30 FHSS cycles

Figure 6.31 Bandwidth sharing

Figure 6.33 DSSS example