Dr. Claude Shannon (1916 – 2001), “the father of information theory,” observed that the maximum error-free capacity in bits per second (bps) obtainable in a communication channel can be found by the Shannon-Hartley equation:
Above, , is the bandwidth of the channel in Hertz and is the signal-to-noise ratio of the channel. Since 0 does not make sense in this situation, assume that the formula below is correct:
This is a “pure” number with no unit labels on it. The value of is called Shannon’s Capacity Limit or channel capacity. This is the theoretical upper limit for the bits per second through the channel with a specific value and a specific given channel frequency, .
Be sure to show your work details for all calculations and explain in detail how the answers were determined for critical thinking questions. Round all value answers to three decimals.
1. In the table below, using the letter T, choose a bandwidth for your communication channel. Write your maximum error-free channel capacity function.
(Note: The actual value of will be your chosen value times 1,000,000 since the table values are in MegaHertz (MHz).)
First letter of your last name
Possible values for in MHz
A–F
100199
G–L
200299
M–R
300399
S–Z
400–499
2. Calculate the derivative of your channel capacity function with respect to Interpret the meaning of it in terms of channel capacity.
3. Generate a graph of this function using Excel or another graphing utility. (There are free downloadable programs like Graph 4.4.2 or Mathematics 4.0; or, there are also online utilities such as this site and many others.) Insert the graph into the Word document containing your answers and work details. Be sure to label and number the axes appropriately.
4. For your function what is the instantaneous rate of change in maximum error-free channel capacity with respect to SNR, for ?
5. What is the equation of the tangent line to the graph of , when ?
6. Research the Internet or Library to find a reasonable (signal and noise values should both be in watts) and bandwidth in Hertz for a CAT6 coaxial cable. Be sure to list creditable sources for your research. Based on your research, what would be the theoretical channel capacity for the CAT6 cable’s value that you found?
7. At what value of will
(Note: You cannot solve this equation algebraically using ordinary techniques. You will need to use an equation solver like Mathematics 4.0 and the fact that or by the Change-of-Base formula for logarithms. Or, you may solve this equation by graphing both and on the same graph to see where these graphs intersect. Alternatively, you may investigate the Lambert W-Function. These are some examples of how you can approximately solve equations when the solution cannot be found easily with usual algebraic methods.)
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