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psk modulation, Spreader- Despreader

HI,

 

I'm working of PSK modulation. As standard FBD suggest, I have made flow diagram accordingly

 

Input Bit generator --> Spreader--> PSK Modulator -------AWGN-------  PSK De-Modualtor --> De-spreader ---> Output bits.

 

Output was not coming as desired, as earlier suggest in the forum I had gone through "MT PSK Transceiver (One shot)" it shows that instead of De-spreader, Spreader is only used.

 

When I replaced De-spreader with spreader everything worked fine.

 

 

My questions is, "Why De-spreader is not used and spreader is doing the job"

 

Thanks in advance for help.

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