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Old 11-19-2009, 12:21 PM
shereen.ahmed
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Default Shannon limit

Dear All

Could you help me :

How calculate BER far from Shannon Limit ????


"Bit-Error Rate (BER) performance that is within ????? db of the
Shannon Limit"?


and how calculate gab of degree distribution from the shannon limit ?



the degree distributions from LDPC codes, which have performance gap
from the
Shannon limit, about.........؟؟؟؟؟؟؟؟
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Old 11-19-2009, 06:34 PM
austin
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Default Re: Shannon limit

sa,

http://en.wikipedia.org/wiki/Noisy-c...coding_theorem

Is a good place to start for an overview.

It took me roughly 1 year of graduate studies, after my 4 years as an
undergraduate, to "master" communications theory. I think that is
typical...

If you have no background in communications theory, I suggest you
start by reading Shannon's two papers:

1. A Mathematical Theory of Communication
2. Communication in the presence of noise

Starting there, it should probably take you less than two years to get
to the latest codes (Shannon's limits apply to the best possible
coding, but there is no known way to derive, or construct a best
possible code - other than trial and error), and no more than another
year to understand MIMO systems ... and so on.

Once you think you know something, design and build communications
system, and plot the Eb/No, and see if it matches what you designed.
If you get that far, you probably know enough to be very dangerous.

http://en.wikipedia.org/wiki/Eb/N0

Austin



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