Mapper for high data rate signalling

Details Mapper for high data rate signalling Mapper for high data rate signalling

1997-03-04

1999-01-19

Bocure, Tesraldet

Pulse or digital communications

Pulse code modulation

375295, H04B 1404

Patent

active

058621792

ABSTRACT:
A pulse amplitude modulated (PAM) mapper includes a constellation matrix memory which stores indications of a plurality of different constellations, wherein at least one of the different stored constellations is of different dimension than another of the stored constellations. The constellations are used individually or together to support a plurality of different modem data rates. In a preferred embodiment, the mapper also includes a logic block, a constellation controller, a PAM code generation block, and an output register. The logic block receives incoming bits and groups the bits as a function of the desired or agreed upon bit rate as indicated by the constellation controller, and provides a plurality of each group of bits to the PAM code generation block, and one or more sign bits to the output register. The PAM code generation block uses the provided bits to choose at least one point from one of the constellations, and uses each chosen constellation point to generate a PAM code (typically .mu.-law or A-law code level) word. Each PAM code word is provided to the output register, and together with associated sign bits generates output bytes. Algorithms are provided for choosing multiple points from the 2D and higher dimensional constellations from provided groups of bits, and for limiting power by substituting combinations of high-power constellation points with otherwise unused lower-power combinations.

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