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Wireless Communications and Networks - …
Spread Spectrum Chapter 18 FHSS Frequency Hopping Spread Spectrum DSSS Direct Sequence Spread Spectrum DSSS using CDMA Code Division Multiple Access 422 Slides for Wireless Communications Edfors, Molisch, TufvessonSingle spectrumtTransmitted signalThe traditional way423 Slides for Wireless Communications Edfors, Molisch, TufvessonSpread Spectrum TechniquesfPower density spectrum [W/Hz]Single carrierbandwidthSpread spectrum bandwidthNoise and interferenceSpread spectrum signalSingle carriersignal424 Slides for Wireless Communications Edfors, Molisch, TufvessonSpread Spectrum TechniquesSpreadingInformationDespreadin gInformationfSpectrumNoise andinterferenceSpectrumfffSpread Spectrum Input is fed into a channel encoder Produces analog signal with narrow bandwidth Signal is further modulated using sequence ofdigits Spreading code or spreading sequence Generated by pseudonoise, or pseudo-random numbergenerator (seed + algorithm) Effect of modulation is to increase bandwidth ofsignal to be transmittedSpread Spectrum On receiving end, the same digit sequence is usedto demodulate the spread spectrum signal Signal is fed into a channel decoder to recoverdataSpread Spectrum Analog data Analog signal Spread Spectrum What can be gained from apparent waste ofspectrum?
Spread Spectrum Chapter 18 FHSS – Frequency Hopping Spread Spectrum . DSSS – Direct Sequence Spread Spectrum . DSSS using CDMA – Code Division Multiple Access
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