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BPSK Capacity Curve - clarification
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daveb1011



Joined: 28 Jun 2009
Posts: 1
Post28 Jun 2009 17:10   

bpsk capacity
Hi everyone.

I'm simulating a type-II hybrid ARQ system using RC-LDPC codes and I would like to plot the BPSK capacity and cutoff rate along with the calculated throughput.

However, I've came across two different versions of the capacity curve for BPSK, as shown in the attached image. The BPSK capacity curve and cutoff rate curve on the right hand side of the attached image are the ones used in most publications when it comes to type-II hybrid ARQ. As one can see the capacity curve is different than the one on the left hand side of the image.

Could someone please explain to me the reason why they are different?

Thank you very much in advance!
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