Title :
Trellis coding of two consecutive full response 4-ary CPFSK with modulation index 1/4
Author :
Lee, Ho-Kyoung ; Divsalar, Dariush ; Weber, Charles
Author_Institution :
Commun. Sci. Inst., Southern California Univ., Los Angeles, CA, USA
Abstract :
A novel representation of CPM (continuous phase modulation) signals in multiple time slots is obtained by using parallel transitions of the trellis structure and memoryless mapping. Specific optimum outer convolutional encoders of two consecutive full-response 4-CPFSK (continuous-phase frequency shift keying) with modulation index 1/4 is achieved by application of the set partition approach. Pre-encoder design is made for the 2 to 16 states by using the set partitioning. A 5.2 to 7.5 dB power gain over the uncoded 4-ary CPFSK full response system is obtained
Keywords :
continuous phase modulation; convolutional codes; frequency shift keying; memoryless systems; trellis coded modulation; 5.2 to 7.5 dB; consecutive full-response 4-CPFSK; continuous-phase frequency shift keying; memoryless mapping; modulation index 1/4; multiple time slots; optimum outer convolutional encoders; power gain; set partition; trellis coding; Convolution; Convolutional codes; Frequency; Modulation coding; Multidimensional systems; Phase modulation; Phase shift keying; Quadrature amplitude modulation; Signal design; Signal mapping;
Conference_Titel :
Communications, 1993. ICC '93 Geneva. Technical Program, Conference Record, IEEE International Conference on
Conference_Location :
Geneva
Print_ISBN :
0-7803-0950-2
DOI :
10.1109/ICC.1993.397240
