ELEC 470, Spring 2004
Prof. Rich Kozick
Date Assigned: Tuesday, January 27, 2004
Date Due: Thursday, January 29, 2004
Continue studying Chapter 2 on signals and Chapter 3 on
linear systems in the Lathi text.
- In class, we computed the channel capacity for a telephone
line that is used by a dial-up modem.
Refer to the Demonstrations and Class Notes
link on the course web page for more information and a sample Matlab
Please compute the channel capacity for a typical cable
modem that operates over a coaxial cable.
Search on the web to determine the bandwidth, B (in Hz), that is
used in most systems.
Also, use the web to determine typical signal to noise ratio (SNR)
values for cable modems.
- Compute the channel capacity, C = B log2(1 +
SNR) (bits/sec), for a range of B and SNR values that are
common for cable modems.
Present your results in a plot or a table.
- Compare the capacity with the bit rates that are actually
achieved with commercially available cable modems.
How close are current cable modems to the capacity limit?
Thank you and have fun.