CDSK modulation-Obtained Result

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Eclipse2007

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when i tried to do simulation in simulink of CDSK modulation i obtain the following signals
1. data
2. chaotic signal
3. dataxchaotic signal delayed
4. addition of 2 and 3
5. Delayed version of 4
6. product of 4 and 5
7. output of my correlator at reception
8. data that i find at reception and that is different from 1

Where is my mistake?
how can i take in consideration only the last value calculated in one period (7) to deduce the data.
 

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