Shaped signal spaces in a simultaneous voice and data system
DCFirst Claim
Patent Images
1. A method for transmitting comprising the steps of:
- a) selecting a data symbol as a function of a data signal, where each data symbol represents a different one of a number of regions of an N-dimensional signal space, and each data symbol is associated with a different N-dimensional signal point in the N-dimensional signal space;
b) selecting an N-dimensional signal point as a function of an applied signal, where the signal point is selected from the N-dimensional signal space;
c) adding the signal space coordinates of the selected data symbol and the selected N-dimensional signal point to provide a resultant signal point;
where each resultant signal point is taken from the region associated with the data symbol and where each one of the number of regions has a non-square shape.
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Abstract
In a simultaneous voice and data communications system, a voice signal is mapped into an N-dimensional signal space constellation as a vector, and added to a reference signal point, i.e., a data symbol, where the data symbol is selected from a constellation of data symbols every signaling interval as a function of a data signal. The constellation signal space is further divided into a number of shaped regions, where each region is associated with a different one of the data symbols. The shape of each region is selected as a function of the characteristics of the voice, or audio, signal. In particular, each region illustratively has a rectangular shape.
29 Citations
14 Claims
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1. A method for transmitting comprising the steps of:
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a) selecting a data symbol as a function of a data signal, where each data symbol represents a different one of a number of regions of an N-dimensional signal space, and each data symbol is associated with a different N-dimensional signal point in the N-dimensional signal space; b) selecting an N-dimensional signal point as a function of an applied signal, where the signal point is selected from the N-dimensional signal space; c) adding the signal space coordinates of the selected data symbol and the selected N-dimensional signal point to provide a resultant signal point; where each resultant signal point is taken from the region associated with the data symbol and where each one of the number of regions has a non-square shape. - View Dependent Claims (2, 3, 4)
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5. A method for use in a communications system for transmitting a data signal and an applied signal, comprising the steps of:
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defining a number of N-dimensional signal spaces, where each N-dimensional signal space includes a number of regions and where at least two of the N-dimensional signal spaces have a different number of regions and a size of at least one dimension of each region is identical; selecting one of the number of N-dimensional signal spaces; and transmitting an N-dimensional signal point from the selected N-dimensional signal space, where the N-dimensional signal point is taken from one of the number of regions of the selected N-dimensional signal space as a function of the data signal and the applied first signal, wherein the applied signal is a voice signal and the shape of each region is proportional to the dynamic range of the voice signal. - View Dependent Claims (6)
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7. A method for transmitting comprising the steps of:
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processing a first signal to provide a sequence of N-dimensional first signal points, each first signal point taken from an N-dimensional signal space, where each first signal point of the sequence defines a respective first signal vector from the origin of the signal space to the first signal point; processing a data signal to provide a sequence of data symbols, each data symbol associated with a different N-dimensional signal point from the signal space; adding each first signal vector to a respective data symbol from the sequence of data symbols to prove a sequence of resultant signal points; and transmitting a signal that represents the sequence of resultant signal points; where the magnitudes of at least one of the first signal vectors is limited in one dimension more than in another dimension. - View Dependent Claims (8)
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9. Apparatus for transmitting comprising:
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first selecting means for selecting an N-dimensional signal point as a function of a first signal where the signal point is selected from an N-dimensional signal space; second selecting means for selecting a data symbol as a function of a data signal, where each data symbol represents one of a number of regions of the signal space, and each data symbol is associated with a different signal point in the N-dimensional signal space; and means for adding in every signaling interval, T, the signal space coordinates of the two selected signal points to provide a resultant signal point; where each resultant signal point is taken from the region associated with the data symbol occurring in a respective signaling interval, and where each one of the number of regions has a non-square shape. - View Dependent Claims (10, 11, 12)
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13. Apparatus for transmitting comprising:
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means for processing a first signal to provide sequence of N-dimensional first signal points, each first signal point taken from an N-dimensional signal space, where each first signal point of the sequence defines a respective first signal vector from the origin of the signal space to the first signal point; means for processing a data signal to provide a sequence of data symbols, each data symbol associated with a different N-dimensional signal point from the signal space; means for adding each first signal vector to a respective data symbol from the sequence of data symbols to prove a sequence of resultant signal points; and means for transmitting a signal that represents the sequence of resultant signal points; where the magnitudes of at least one of the first signal vectors is limited in one dimension more than in another dimension. - View Dependent Claims (14)
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Specification