Technique for achieving the full coding gain of encoded digital signals
First Claim
1. Apparatus for transmitting a data signal which represents information, said data signal being corrupted by noise which is substantially colored after propagating through a communications medium, said apparatus comprisingmeans for encoding said information using a code, the utilized code providing the encoded information having improved immunity to white noise relative to the uncoded information, andmeans for nonlinearly processing said encoded information in such a manner that distortion associated with subsequent whitening of said noise in receiver apparatus is reduced.
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Abstract
In a telephone local loop transmission arrangement, data is communicated from the customer premises to the central office utilizing a multi-dimensional, 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.
128 Citations
8 Claims
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1. Apparatus for transmitting a data signal which represents information, said data signal being corrupted by noise which is substantially colored after propagating through a communications medium, said apparatus comprising
means for encoding said information using a code, the utilized code providing the encoded information having improved immunity to white noise relative to the uncoded information, and means for nonlinearly processing said encoded information in such a manner that distortion associated with subsequent whitening of said noise in receiver apparatus is reduced.
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5. A method for transmitting a data signal which represents information, said data signal being corrupted by noise which is substantially colored after propagating through a communications medium, said method comprising the steps of
encoding said information using a code, the utilized code providing the encoded information having improved immunity to white noise relative to the uncoded information, and nonlinearly processing said encoded information in such a manner that distortion associated with subsequent whitening of said noise in receiver apparatus is reduced.
Specification