POLISH ACADEMY of SCIENCES
TECHNICAL SCIENCES
Electronics
| BULLETIN
of the
POLISH ACADEMY of SCIENCES TECHNICAL SCIENCES |
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| Volume
56, Issue 3, September 2008
Electronics |
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| Issue Index | Authors Index | Scope Index | Web Info | |
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| Aims&Scope, Subscription | Editors | Authors' guide | to read PDF files | mirror: http://fluid.ippt.gov.pl/~bulletin/ |
| pp 247 - 251 |
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Shannon theory. Myths and reality |
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| J. PAWELEC |
| The significance of the famous Shannon's publication "A mathematical theory of communication" is discussed. The author states that this theory was a breakthrough for the times it was created. The present-day communications is so highly developed, that some old maxims should be up-dated, particularly the definition of the lower bound of signal reception. The author claims that this bound is no longer a constant value, ln(2), as the Shannon's theory states, but depends on many factors such, as the ratio of bandwidth-to-information transmission rate, the class of a receiver (adaptive, cognitive, MIMO1), the kind of reception system (on-line or off-line), and - of course - on the characteristics of noise, including entropy. Then, an absolute limit (Eb/N0)abs = 0 is suggested. An example of an advanced adaptive system approaching this bound is given. |
| Key words: |
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communication theory, Shannon’s contribution, reception bound, adaptive receiver. |
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| Issue Index | Authors Index | Scope Index | Web Info |
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| Aims&Scope, Subscription | Editors | Authors' guide | to read PDF files |
| Copyright
® Bulletin of the Polish Academy of Sciences: Technical Sciences
October 2008 |
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