Title :
Multilevel codes for high-speed voiceband data modem
Author :
Ushirokawa, Akihisa ; Matsui, Hitoshi
Author_Institution :
NEC Corp., Kanagawa, Japan
Abstract :
A novel class of multilevel codes is proposed for achieving high coding gain. Multilevel codes composed of two-level codes are investigated from the standpoint of the systematic design of codes. Two-level codes as component codes are shown to be preferable to a combination of conventional one-level codes in coding gain and decoder delay. For a 19.2 kb/s voiceband modem application, this scheme presents a class of coded modulation superior to trellis-coded modulation in simultaneous realization of high coding gain, low/moderate decoder complexity, and short decoding delay
Keywords :
codes; modems; 19.2 kbit/s; coded modulation; coding gain; component codes; decoder delay; decoding delay; high-speed voiceband data modem; multilevel codes; two-level codes; Channel coding; Convolutional codes; Decoding; Delay; Hamming distance; Laboratories; Modems; Modulation coding; National electric code; Satellites;
Conference_Titel :
Global Telecommunications Conference and Exhibition 'Communications Technology for the 1990s and Beyond' (GLOBECOM), 1989. IEEE
Conference_Location :
Dallas, TX
DOI :
10.1109/GLOCOM.1989.64280
