Title :
Convolutional codes over GF(4) for 4-ary distance-invariant CPFSK signalling
Author :
Ugrelidze, N.A. ; Shavgulidze, S.A. ; Asanidze, 1.G.
Author_Institution :
Inst. of Commun., Georgian Tech. Univ., Tbilisi, Georgia
fDate :
6/10/1993 12:00:00 AM
Abstract :
Combinations of new convolutional codes over GF(4) and 4-ary distance-invariant CPFSK modulation are considered. The best codes that ensure maximum free Euclidean distance in signal space are given in a Table. The convolutional codes are termed, ´concordant´ because their trellis diagram topologically coincides with the joint signal-code trellis diagram.
Keywords :
convolutional codes; frequency shift keying; telecommunication signalling; trellis codes; 4-ary distance-invariant CPFSK signalling; CPFSK modulation; GF(4); concordant codes; convolutional codes; joint signal-code trellis diagram; maximum free Euclidean distance; signal space; trellis diagram;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19930736
