Apparatus and method for detecting signal points using signal point-mapping
AssigneeSony Corporation
InventorTamotsu Ikeda
Life of this patent
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Abstract
An apparatus and method for detecting signal points transmitted over a transmission line. A data transmitter encodes input data and maps this data in accordance with a Trellis Code Modulation technique. The mapped data is then modulated onto a particular carrier wave, and transmitted to a data receiver. The data receiver compensates for any detected phase shift in the carrier wave, and decodes the phase-corrected data to quickly detect parallel path information of the received data.
Claims10
An apparatus for decoding a digital signal transmitted over a transmission path as a plurality of signal points, said plurality of signal points being divided into a plurality of subsets, said plurality of subsets comprising at least two groups, each group having at least four subsets, each subset having at least two signal points arranged symmetrically with respect to a reference point, wherein the signal points of a first subset correspond to the signal points of a second subset when said first subset is rotated through an angle .phi. about said reference point, comprising:
- means for receiving said digital signal;
- means for demodulating said signal to obtain coordinate components thereof;
- and
- decoder means for calculating a distance between the coordinate components of the demodulated digital signal and each of signal points in said second subset, said decoder means decoding said digital signal to obtain said first subset in accordance with the calculated distance such that the most significant bit of each of said signal points of said second subset is equal to the most significant bit of each of said corresponding signal points of said first subset after said first subset has been rotated through said angle .phi..
A method of decoding a digital signal received as a plurality of signal points, said plurality of signal points being divided into a plurality of subsets, said plurality of subsets comprising at least two groups, each group having at least four subsets, each subset having at least two signal points arranged symmetrically with respect to a reference point, wherein the signal points of a first subset correspond to the signal points of a second subset when said first subset is rotated through an angle .phi. about said reference point, comprising the steps of:
- demodulating said received digital signal to obtain coordinate components thereof;
- calculating a distance between the coordinate components of the demodulated digital signal and each of the signal points in said second subset;
- and
- decoding said digital signal to obtain said first subset in accordance with the calculated distance such that the most significant bit of each of said signal points of said second subset is equal to the most significant bit of each of said corresponding signal points of said first subset after said first subset has been rotated through said angle .PHI..
Dependencies are inferred from the claim text.