Are symbol synchronization and frame synchronization the sam
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Are symbol synchronization and frame synchronization the sam

 
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Ant_Magma
Guest
Posted: Tue Dec 27, 2005 8:37 am    Post subject: Are symbol synchronization and frame synchronization the sam Reply with quote
If not what's the difference?
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IM
Guest
Posted: Tue Dec 27, 2005 9:15 am    Post subject: Re: Are symbol synchronization and frame synchronization the Reply with quote
Hello:

Frame synchronization is when you have a packet and you want to know
where the start of a frame which may contain numerous samples/symbols
is actually starting. So protocols will have a frame structure that
being with a certain know frame symbols (often called preamble). This
known sequence (e.g. Barker code) will be the way to detect the start
of a frame.

Symbol synchronization however associated with timing recovery..
whereby you would want to detect a symbol where there is minimum
interference from other neighboring or adjacent symbols. Hence you
would want to detect where the eye in the eye-diagram is lagest. The
phase of the sampling clock has to be adjusted in order to do this.
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IM
Guest
Posted: Tue Dec 27, 2005 9:15 am    Post subject: Re: Are symbol synchronization and frame synchronization the Reply with quote
Hello:

Frame synchronization is when you have a packet and you want to know
where the start of a frame which may contain numerous samples/symbols
is actually starting. So protocols will have a frame structure that
being with a certain know frame symbols (often called preamble). This
known sequence (e.g. Barker code) will be the way to detect the start
of a frame.

Symbol synchronization however associated with timing recovery..
whereby you would want to detect a symbol where there is minimum
interference from other neighboring or adjacent symbols. Hence you
would want to detect where the eye in the eye-diagram is lagest. The
phase of the sampling clock has to be adjusted in order to do this.
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Vladimir Vassilevsky
Guest
Posted: Tue Dec 27, 2005 5:15 pm    Post subject: Re: Are symbol synchronization and frame synchronization the Reply with quote
Ant_Magma wrote:

Quote:
If not what's the difference?


Symbol sync establishes the sampling instant for a symbol.
Frame sync establishes where the packet begins.

Vladimir Vassilevsky

DSP and Mixed Signal Design Consultant

http://www.abvolt.com
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Ant_Magma
Guest
Posted: Wed Dec 28, 2005 9:15 am    Post subject: Re: Are symbol synchronization and frame synchronization the Reply with quote
Ah, i see. So symbol sync has got to do with sampling offsets right?
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IM
Guest
Posted: Thu Dec 29, 2005 5:16 pm    Post subject: Re: Are symbol synchronization and frame synchronization the Reply with quote
yes
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