Title :
Superframe-based bit allocation algorithms for DMT systems
Author_Institution :
Texas Instrum. Inc., San Jose, CA, USA
Abstract :
A superframe-based DMT transceiver system with multiple bit tables (SM-DMT) is proposed. This proposed system can be applied to either a frequency division multiplexed (FDM) DMT system or a time division multiplexed (TDM) DMT system. The latter system is also known as synchronized DMT (SDMT) systems. This paper shows how an SM-DMT system provides optimal performance in situations where either a FDM-based DMT system or a TDM-based DMT system may suffer from performance degradation. A bit allocation algorithm for SM-DMT systems is also presented. Simplified algorithms based on grouping and table-sharing are described to reduce the practical complexity requirement
Keywords :
digital subscriber lines; frequency division multiplexing; modulation; optimisation; synchronisation; time division multiplexing; transceivers; ADSL; DMT transceiver system; FDM-based DMT system; HDSL; ISDN; SM-DMT system; TDM-based DMT system; VDSL; asymmetric digital subscriber line; complexity requirement reduction; data communications; discrete multitone modulation; frequency division multiplexed system; grouping; multicarrier modulation; multiple bit tables; optimal performance; superframe-based bit allocation algorithms; synchronized DMT systems; table-sharing; time division multiplexed system; very-high-speed digital subscriber line; Additive white noise; Bit rate; Crosstalk; Data communication; Frequency division multiplexing; Frequency synchronization; Gaussian noise; OFDM modulation; Signal to noise ratio; Time division multiplexing;
Conference_Titel :
Global Telecommunications Conference, 1998. GLOBECOM 1998. The Bridge to Global Integration. IEEE
Conference_Location :
Sydney,NSW
Print_ISBN :
0-7803-4984-9
DOI :
10.1109/GLOCOM.1998.776498
