Trellis precoding for modulation systems
First Claim
1. A method of mapping a digital data sequence into a signal point sequence for data transmission over a channel characterized by a non-ideal response, comprisingdefining a filtered trellis code,selecting said signal point sequence from a subset of all possible signal point sequences based on said digital data sequence and upon said response, all possible signal point sequences in said subset lying in a fundamental region of a filtered trellis code, said fundamental region being other than a simple Cartesian product of finite-dimensional regions.
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Abstract
In general the invention features mapping a digital data sequence into a signal point sequence for data transmission over a channel characterized by a non-ideal response, by selecting the signal point sequence from a subset of all possible signal point sequences based on the digital data sequence and upon the response, all possible signal point sequences in the subset lying in a fundamental region of a filtered trellis code, the fundamental region being other than a simple Cartesian product of finite-dimensional regions.
68 Citations
37 Claims
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1. A method of mapping a digital data sequence into a signal point sequence for data transmission over a channel characterized by a non-ideal response, comprising
defining a filtered trellis code, selecting said signal point sequence from a subset of all possible signal point sequences based on said digital data sequence and upon said response, all possible signal point sequences in said subset lying in a fundamental region of a filtered trellis code, said fundamental region being other than a simple Cartesian product of finite-dimensional regions.
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35. Apparatus for mapping a digital data sequence into a signal point sequence for data transmission over a channel characterized by a non-ideal response, comprising
means for accepting said digital data sequence, and a signal point selector for selecting said signal point sequence from a subset of all possible signal point sequences based on said digital data sequence and upon said response, all said possible signal point sequences in said subset lying in a fundamental region of a filtered trellis code, said fundamental region being other than a simple Cartesian product of finite-dimensional regions.
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36. A modem for transmitting and receiving digital data sequences via a channel comprising
means for mapping a said diqital data sequence into a signal point sequence for data transmission over a channel characterized by a non-ideal response, including a sequence selector for selecting said signal point sequence from a subset of all possible signal point sequences based on said diqital data sequence and upon said response, all said possible signal point sequences in said subset lying in a fundamental region of a filtered trellis code, said fundamental region being other than a simple Cartesian product of finite-dimensional regions, a modulator for sending said signal points of said sequence via said channel, a demodulator for receiving a possibly channel-affected version of said signal point sequence from said channel, and means for recovering a digital data sequence from said possibly channel-affected version of said signal point sequence.
Specification