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mro83
Joined: 06 Oct 2004
Posts: 227
Helped: 18
Location: Mashad
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 08 Jul 2006 18:05 GSM interleaver problem |
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Hi
I am trying to understand the interleaver part of the GSM interleaver but I have a difficulty to understand it (my focus is on the SDCCH or SACCH channel).
can anyone help me or introduce me a good reference to read.
my problems:
1) What is an interleaver? (plz introduce a good ref.)
2) How can I convert the interleaver rule (as explained in the ETSI standards) to a vector or matrix ANDing or XORing to the data entered the interleaver? (I have read the ETS 300 575 standard but I didn't understand it).
thanx
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manojkrshukla
Joined: 06 Jun 2006
Posts: 46
Helped: 5
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| 09 Jul 2006 13:58 Re: GSM interleaver problem |
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interleaver is matrix in which data is entered row-wise and taken out as column-wise. In this way , data is coded.
In the receiver side, the data is again intered row-wise and the output is taken as column-wise. So, same data is recovered.
\
you can see it in "Wireless Comm. " by Rappaport, 2nd ed.
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mro83
Joined: 06 Oct 2004
Posts: 227
Helped: 18
Location: Mashad
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| 09 Jul 2006 14:02 Re: GSM interleaver problem |
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thanx
and the second problem?
It is more hard to answer.
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