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How does the unwrap function in Matlab work ?

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bizoo

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HI
i am using matlab for demodulation of dqpsk signals, my approach gave a bit of faulty answers, but whe i used a built in function in matlab, the answer came out right

upon a bit of search, i find out that matlab is using unwrap function,
i looked at its help but it looks and sounds weird, inshort i did nt get it

get some one explain what is this function and when one needs it

br
 

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