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SPREAD SPECTRUM UNIT 3 PART 2 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
6. 3-2  SPREAD SPECTRUM In spread spectrum (SS), we combine signals from different sources to fit into a larger bandwidth, but our goals are to prevent eavesdropping and jamming. To achieve these goals, spread spectrum techniques add redundancy. ,[object Object],[object Object],Topics discussed in this section:
Spread Spectrum ,[object Object],[object Object],[object Object],[object Object],[object Object],6.
6. Figure 3.21  Spread spectrum
6. Figure 3.22  Frequency hopping spread spectrum (FHSS)
6. Figure 3.23  Frequency selection in FHSS
6. Figure 3.24  FHSS cycles
6. Figure 3.25  Bandwidth sharing
6. Figure 3.26  DSSS
DSSS MODULATION 6.
DSSS DEMODULATION 6.
6. Figure 3.27  DSSS example
DS-SS  Vs  FH-SS PERFORMANCE ISSUES 6.
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Copyright 2005 All Rights Reserved February 2005 Co-location Comparison Date Rate in Mbps
UNIT - 3 THE END 6.

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Spread Spectrum Techniques Explained