Mapper for high data rate transmission through channels subject

Details Mapper for high data rate transmission through channels subject Mapper for high data rate transmission through channels subject

1997-04-08

1999-01-19

Boojre, Tesfaldet

Pulse or digital communications

Transmitters

H04L 2704

Patent

active

058621849

ABSTRACT:
A mapper for a PAM encoder is provided and includes apparatus for generating desired code levels, and a constellation matrix memory which stores indications of a plurality of different N-dimensional constellations. The plurality of different constellations are used individually or together to support a plurality of different modem data (bit) rates. In order to maximize performance in the presence of robbed bit signalling, multidimensional constellations having different numbers of points are used together in the coding of a single group of bits.

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"The Capacity of PCM Voiceband Channels", Kalet, et al., IEEE Intern'l Conference on Communications '93, pp. 507-511.
"A Mathematical Theory of Communication". Bell Systems Technical Journal, 27:379-423, 623-656.

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