Digital modulation technique
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsTamas Szili, János Ladvánszky
Life of this patent
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Abstract
A technique for performing data modulation is described. As to a method aspect of the technique, n bits of data are mapped to one modulation symbol (502) out of a modulation alphabet comprising 2n modulation symbols (502). The modulation alphabet corresponds to a finite subset of a hexagonal lattice in a constellation plane (500) spanned by an in-phase value (506) and a quadrature value (508) of a signal. All modulation symbols (502) are spaced apart in the constellation plane (500) from a direct current, DC, component corresponding to zero in-phase value and zero quadrature value. The signal corresponding to the mapped modulation symbol (502) is output.
Claims19
A method of performing digital modulation, the method comprising:
- mapping n bits of data to one modulation symbol out of a modulation alphabet comprising 2n modulation symbols, wherein the modulation alphabet corresponds to a finite subset of a hexagonal lattice in a constellation plane spanned by an in-phase value and a quadrature value of a signal, wherein the 2n modulation symbols are in a rhombus, and wherein all modulation symbols are spaced apart in the constellation plane from a direct current (DC) component corresponding to zero in-phase value and zero quadrature value;
- and
- outputting the signal corresponding to the mapped modulation symbol.
A method of performing digital demodulation, the method comprising:
- receiving a signal corresponding to n bits of data;
- and
- mapping the received signal to one modulation symbol out of a modulation alphabet comprising 2n modulation symbols, wherein the modulation alphabet corresponds to a finite subset of a hexagonal lattice in a constellation plane spanned by an in-phase value and a quadrature value of the signal, and wherein all modulation symbols are spaced apart in the constellation plane from a direct current (DC) component corresponding to zero in-phase value and zero quadrature value.
A device for performing digital modulation, the device comprising:
- processing circuitry;
- memory containing instructions executable by the processing circuitry whereby the device is operative to:
- map n bits of data to one modulation symbol out of a modulation alphabet comprising 2n modulation symbols, wherein the modulation alphabet corresponds to a finite subset of a hexagonal lattice in a constellation plane spanned by an in-phase value and a quadrature value of a signal, wherein the 2n modulation symbols are in a rhombus, and wherein all modulation symbols are spaced apart in the constellation plane from a direct current, DC, component corresponding to zero in-phase value and zero quadrature value;
- and
- output the signal corresponding to the mapped modulation symbol.
A device for performing digital demodulation, the device comprising:
- processing circuitry;
- memory containing instructions executable by the processing circuitry whereby the device is operative to:
- receive a signal corresponding to n bits of data;
- and
- map the received signal to one modulation symbol out of a modulation alphabet comprising 2n modulation symbols, wherein the modulation alphabet corresponds to a finite subset of a hexagonal lattice in a constellation plane spanned by an in-phase value and a quadrature value of the signal, and wherein all modulation symbols are spaced apart in the constellation plane from a direct current, DC, component corresponding to zero in-phase value and zero quadrature value.
Dependencies are inferred from the claim text.