Questions about coding: correlative coding, channel coding

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Coding........

Why we go for coding in the transmission side; if coding not used , wht will happen?

What is correlatively coded OFDM?

What is power spectral density and spectral rolloff ?


Can anybody define the above shortly for understanding....
 

Re: Coding........

Thank u very much for ur reply .... its very useful for me

1. What is correlative coding?

2. What do u mean "It is a class of correlative codes ", is there any different types of correlative coding ? pls tell some points to understand...

3. Also tell about "small fractional out-of-band power" in your reply...
 

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