Spectral and power shaping mapper for high data rate signalling

Details Spectral and power shaping mapper for high data rate signalling Spectral and power shaping mapper for high data rate signalling

1997-05-05

1998-10-20

Ghebretinsae, Temesghen

Pulse or digital communications

Transceivers

Modems

375295, H04B 138

Patent

active

058258167

ABSTRACT:
A spectral and power shaping mapper for high data rate signaling modem is provided. Based on data rates and other criteria, groups of incoming bits are grouped together, with a first subgroup of bits being used to generate two sign vectors, a second subgroup of bits being used in conjunction with an appended bit to generate two magnitude manipulation vectors, and a third subgroup of bits being used in a modulus converter to generate a plurality of quotients (r.sub.k). The quotients and magnitude manipulation vectors are used to select two or more sequences of constellation points from a multidimensional constellation. The sequences of selected points are combined with the sign vectors to generate four sequences of octets for a shaping selector. The shaping selector, preferably in the form of a convolutional encoder state machine uses criteria such as lowest cost paths and/or lowest average power in order to select which sequence of octets to output.

REFERENCES:
patent: 5436930 (1995-07-01), Bremer et al.
patent: 5696794 (1997-12-01), O'Dea

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