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16-QAM togeter with rate 1/2 coding

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Aya2002

Aya2002

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He Friends,

i read in a book the following:

16-QAM together with rate 1/2 coding to get 2 bits per symbol.

another thing is:

QPSK with rate 3/4 coding, to get 1.5 bits per symbol.

can someone please explain these two things, as i know, the 16-QAM will introduce a 4 bits per symbol, and for the QPSK will introduce 2 bits per symbol!!!!!!

Thanks in advance....
 

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