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
program.
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 log_{2}(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?