Title :
Application of turbo codes for discrete multi-tone modulation schemes
Author :
Sadjadpour, Hamid R.
Author_Institution :
AT&T Shannon Labs., Florham Park, NJ, USA
Abstract :
A multi-tone QAM modulation technique suitable for discrete multi-tone (DMT) systems based on the combination of the so called turbo codes and trellis code modulation (TCM) is presented. The advantage of this system is its high coding gain together with the bandwidth efficiency which is suitable for asymmetric digital subscriber line (ADSL) modems for twisted pair wires. Some suggestion is given to combat burst noise, frequency selective noise, or interference in the design of the turbo code. The results are compared to the recommended 16 state 4-dimensional Wei code in the ANSI standard. Simulation results demonstrate substantial coding gain for all QAM modulation levels from 4 QAM to 256 QAM
Keywords :
decoding; digital subscriber lines; modems; noise; quadrature amplitude modulation; trellis coded modulation; turbo codes; twisted pair cables; 256 QAM; 4 QAM; ADSL modems; ANSI standard; DMT systems; TCM; Wei code; asymmetric digital subscriber line; bandwidth efficiency; burst noise; coding gain; decoding; discrete multi-tone modulation; frequency selective noise; high coding gain; interference; multi-tone QAM; simulation results; trellis code modulation; turbo codes; twisted pair wires; Bandwidth; Convolutional codes; DSL; Frequency; Modems; Modulation coding; OFDM modulation; Quadrature amplitude modulation; Turbo codes; Wires;
Conference_Titel :
Communications, 1999. ICC '99. 1999 IEEE International Conference on
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-5284-X
DOI :
10.1109/ICC.1999.765428
