capacity of a communication link based on QPSK modulation

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sharlotte

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capacity of a communication link and QPSK modulation

does any body know the capacity of a communication link based on QPSK modulation;
how is it related to the Shannon theorem?
 
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Re: capacity of a communication link and QPSK modulation

sharlotte said:
does any body know the capacity of a communication link based on QPSK modulation;
how is it related to the Shannon theorem?
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When a modulation scheme is used, we call the "capacity" the achievable rate. In the case of QPSK, the maximum achievable rate is 2 bit/channel use. On the other hand, when the channel input is unconstrained (Gaussian), as in the case of Shannon derivation, the capacity is much higher especially in the high SNR.
 
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