Title :
On the Shannon capacity of DC- and Nyquist-free codes
Author :
Frederickson, L.J.
Author_Institution :
IBM Corp., San Jose, CA, USA
fDate :
5/1/1991 12:00:00 AM
Abstract :
The design of codes which are simultaneously DC- and Nyquist-free is considered. The Shannon capacity of codes that are simultaneously DC- and Nyquist-free is tabulated as a function of the number of allowed running digital sum and alternating digital sum states. For this constraint, the set of possible rational capacities is shown to be (1/4,1/2,3/4). A rate 3/4 DC- and Nyquist-free code is used to demonstrate the ability to code at the highest rational capacity available.
Keywords :
channel capacity; error correction codes; DC-free code; Nyquist-free codes; Shannon capacity; alternating digital sum; rational capacities; running digital sum; Analysis of variance; Binary codes; Books; Electrons; Frequency; Magnetic recording; Modulation coding; Pulse modulation; Strontium;
Journal_Title :
Information Theory, IEEE Transactions on
