FSK Demodulator and sync index found

Hello.
I am very much confused regarding understanding the in depth function of this block. i have following questions.
1) what is the purpose of FIFO in this FSK demodulator.vi? what is the length of these FIFO?
2) if i have a complete packet and data like below then what will be the output of this FSK demodulator block?
random arbitray data (8bits)+ gaurd bits (2bits)+sync bits (16bits)+data (60bits)+random arbitrary data(8bits)
what will be extracted exactly from this provided data and how?
3) how much data is buffered/queued by this FSK demodulator out of which it try to find the peak of correlation?
4) where is the process of finding peak correlation takin place in this vi.
5) can this FSK demodulator.vi be used for receiving bursty communication?
6) why is sync index found a decimal value? if it shows the start of sync SYMBOL then it should be some complete integer . i hope sync index found is related to extracting message bits (and is entirely a different process from max eye sub vi or symbol timing synchronization)
I would be thankfull if i get some detailed descriptive reply. thankyou so much.
i am working on FSK transceiver example present in labview 2012.

Hello Maria,
You can use the MT Generate Synchronization Parameters VI to tell the FSK Demodulator VI to look for a sequence of sync bits. You will have to embedded these sync bits in your bit stream yourself in the transmission side.
Beyond this, I don't think the demodulator VI does any "decoding" of your bit stream. It simply takes samples fetched IQ samples from the RFSA driver and converts them bits based on the FSK scheme. What you do with the demodulated bit stream is up to you.
The demodulator VI also doesn't detect bursts for you. You will either have to tell your VSA to aquire only bursts of data. Or detect the bursts in software.
I can't reveal much detail about the demodulator algorithm itself because its proprietary. However, since you can open up the VI, you can always use LabVIEWs debugging tools to get a better understanding of what its doing.
Wan L
Applications Engineer
National Instruments
http://www.ni.com/support

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The input waveform is shown in the following figure:
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Attachments:
questions.zip ‏506 KB

Hello Anthony F,
   Yes, I use the modulation toolkit.But I encapulate it into a subvi. Sorry for that I forget to attach it.
Attachments:
sub_demodulate_FSK_data.vi ‏21 KB

Difference between sy-tabix and sy-index?

tell me about sy-tabix and sy-index?what is the difference between sy-tabix and sy-index?
Moderator Message: Please search before posting. Read the [Forum Rules Of Engagement |https://wiki.sdn.sap.com/wiki/display/HOME/RulesofEngagement] for further details.
Edited by: Suhas Saha on Jun 18, 2011 5:33 PM

HI,
Here is a brief description of difference between SY_TABIX and SY_INDEX and using them with several conditions.
SY-TABIX
Current line of an internal table. SY-TABIX is set by the statements below, but only for index tables. The field is either not set or is set to 0 for hashed tables.
APPEND sets SY-TABIX to the index of the last line of the table, that is, it contains the overall number of entries in the table.
COLLECT sets SY-TABIX to the index of the existing or inserted line in the table. If the table has the type HASHED TABLE, SY-TABIX is set to 0.
LOOP AT sets SY-TABIX to the index of the current line at the beginning of each loop lass. At the end of the loop, SY-TABIX is reset to the value that it had before entering the loop. It is set to 0 if the table has the type HASHED TABLE.
READ TABLE sets SY-TABIX to the index of the table line read. If you use a binary search, and the system does not find a line, SY-TABIX contains the total number of lines, or one more than the total number of lines. SY-INDEX is undefined if a linear search fails to return an entry.
SEARCH <itab> FOR sets SY-TABIX to the index of the table line in which the search string is found.
SY-INDEX
In a DO or WHILE loop, SY-INDEX contains the number of loop passes including the current pass.
Hope this helps.
Thank you,
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