pn code synchronization

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erece

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In the frequency hopping acquisition ( which is the first step of pn code synchronization ) system why do we add time delays to each matched filter??
 

Hi erece! I want to build a FHSS system and I got the problem about PN synchronization. Please tell me where do you find this picture? Thanks
And the answer for your question: it is Passive Correlation. The delay block is inserted to ensure the signals add (sum) at the same time (synchronous)
 
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