Title :
Trellis codes for 4-ary continuous phase frequency shift keying
Author :
Naraghi-Pour, Morteza
Author_Institution :
Dept. of Electr. & Comput. Eng., Louisiana State Univ., Baton Rouge, LA, USA
fDate :
11/1/1993 12:00:00 AM
Abstract :
The approach of Morales-Moreno and Pasupathy (1988) is extended for the design of trellis codes for 4-ary continuous phase frequency shift keying (CPFSK) with modulation index h=1/2. The criterion for comparison of codes is the maximum free Euclidean distance for a given rate and the number of states of the signal space code. For the same number of states of the signal space code, these codes improve the free Euclidean distance by up to 1.25 dB over previously published results. Finally, the implementation of the combined coding and modulation system is discussed
Keywords :
frequency shift keying; trellis codes; 4-ary continuous phase frequency shift keying; CPFSK; code rate; code states; coding; maximum free Euclidean distance; modulation; modulation index; signal space code; trellis codes; AWGN channels; Application software; Communications Society; Convolutional codes; Euclidean distance; Frequency response; Frequency shift keying; Helium; Matched filters; Modulation coding;
Journal_Title :
Communications, IEEE Transactions on
