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The whole thing of Spread Spectrum is a) to withstand the jamming from another source b) information hiding techniques.
Spread Spectrum is inherently jamming resistant. More chips you enter to spreading the better is it to withstand the jamming.
The hybrid version of DS/FH is mainly (or at least started that way) is for information hiding techniques.
Normally Direct Sequence or Frequency Hopping techniques in specifics of them employ a lot of bandwidth/power wasted and Hybrid DS/FH is desiged to be somewhat also a bridge/gap where you can play better. It just gives you options. I think this would be an advantage I think.
If the total available bandwidth is too large it is not feasible to use DS alone, since the chip rate will be very high, which may require very high speed circuits and very wide band receivers. In this case we can benefit from the available bandwith by using hybrid DS/FH.
Pure FH typically requires non-coherent modultion technique, like FSK. The performance of such systems is less than the coherent modulation techniques.
Therefore, if the bandwidth is very large and we want a coherent modulation/demodulation technique, a hybrid DS/FH is a good choice.
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