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bluetooth modulation process

Question asked by anandkumarjha in #Coffee Room on Aug 9, 2010
anandkumarjha
anandkumarjha · Aug 9, 2010
Rank C2 - EXPERT
what kind of modulation are adopted in bluetooth technology? Posted in: #Coffee Room
rishi0922
rishi0922 · Aug 10, 2010
Rank C1 - EXPERT
Bluetooth uses Frequency Hopping Spread Spectrum (FHSS) technique which is used in spread spectrum signal transmission.

FHSS makes bluetooth communication more robust and secure.

https://en.wikipedia.org/wiki/Frequency-hopping_spread_spectrum
anandkumarjha
anandkumarjha · Aug 10, 2010
Rank C2 - EXPERT
rishi0922
Bluetooth uses Frequency Hopping Spread Spectrum (FHSS) technique which is used in spread spectrum signal transmission.

FHSS makes bluetooth communication more robust and secure.

Frequency-hopping spread spectrum - Wikipedia, the free encyclopedia
Hello Rishi
could you please elaborate FHSS?
durga ch
durga ch · Aug 10, 2010
Rank A2 - PRO
to understand Frequency hoping spread spectrum, its is necessary to understand how spread spectrum technology works.
In spread spectrum , all you do is- spread your signal onto a very high frequency carrier wave form at the transmitter and retrieve the same at the receiver. The trick is - not only you, all other users will use the same bandwidth. The only way in which the receiver can know who you are - is by using some kind of pin to detect your signal. Your carrier wave is generated using this code and transmitted.
At the receiver, we multiple the same carrier wave to generate the original signal.

Now coming to FHSS,
the name itself says. it involves something like frequency and hopping. Here, our data signal will use single frequency of the complete carrier band and keep hopping to a different frequency.the way in which your signal hops over the carrier frequency is determined by a code. The code is such that no two users use same frequency to trasmit at any given time. So in a sense you are achieving orthogonality here.

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