Technique for achieving the full coding gain of encoded digital signals
First Claim
1. Apparatus for use in a communications system wherein transmitted data symbols can be represented by allowable signal points lying within a plurality of signal point subsets, said plurality of signal point subsets forming a signal constellation encompassing an associated region and the transmitted data symbol at each of a succession of times being represented by an allowable signal point in one signal point subset, said apparatus comprisingmeans for receiving the transmitted data symbol at each of said succession of times;
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Accused Products
Abstract
In a telephone local loop transmission arrangement, data is communicated from the customer premises to the central office utilizing a multidimensional, passband signal illustratively at 480 kb/s. Specifically, the transmitted signal is encoded in a trellis code and precoded using a generalized partial response filter. The received signal is processed by a circuitry that implements a trellis decoding in combination with nonlinear filtering.
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Citations
13 Claims
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1. Apparatus for use in a communications system wherein transmitted data symbols can be represented by allowable signal points lying within a plurality of signal point subsets, said plurality of signal point subsets forming a signal constellation encompassing an associated region and the transmitted data symbol at each of a succession of times being represented by an allowable signal point in one signal point subset, said apparatus comprising
means for receiving the transmitted data symbol at each of said succession of times; - and
means for assigning each received data symbol to a plurality of preferred signal points lying within an expanded constellation encompassing an expanded region and including said allowable signal points and at least one artificial signal point, each artificial signal point corresponding to a different allowable signal point and each preferred signal point in said plurality corresponding to a different one of said plurality of signal point subsets. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for use in a communications system wherein transmitted data symbols can be represented by allowable signal points lying within a plurality of signal point subsets, said plurality of signal point subsets forming a signal constellation encompassing an associated region and said transmitted data symbol at each of a succession of times being represented by an allowable signal point in one signal point subset, said apparatus comprising
receiving the transmitted data symbol at each of said succession of times; - and
assigning each received data symbol to a plurality of preferred signal points lying within an expanded constellation encompassing an expanded region and including said allowable signal points and at least one artificial signal point, each artificial signal point corresponding to a different allowable signal point and each preferred signal point in said plurality corresponding to a different one of said plurality of signal point subsets.
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Specification