Device and method for determining a constellation of a quadrature amplitude modulated signal
View Patent ↗The invention relates to a method and/or a device for determining a constellation from a plurality of possible constellations with a constellation identification device which is used to determine the constellation of the signal from a plurality of possible constellations. This is advantageously achieved when a converter is arranged to convert the signal into polar coordinates provided with a radial component, and to provide a radius as a radial component of the signal, wherein the constellation identification device is constructed so as to determine the constellation of the signal from the radius.
1. A device for determining a constellation from a plurality of possible constellations, comprising:
a constellation identification device for determining the constellation of the signal (s) from a plurality of possible constellations,
a converter configured to convert the signal (s) into coordinates with a radial component, and to provide a radius (r) as the radial component of the signals, and
wherein the constellation identification device is constructed so as to determine the constellations (16 QAM; 32 QAM; . . . ) from the radius (r) of the signal (s).
2. The device according to claim 1 , wherein the converter is constructed as a CORDIC.
3. The device according to claim 1 further comprising a discriminator and wherein a first input of the discriminator that receives the radius is coupled to the constellation identification device.
4. The device according to claim 3 , wherein an output of the constellation identification device coupled to the discriminator in order to input constellation information that is to be taken into account during the determination of a symbol.
5. The device according to claim 1 , further comprising an amplification control device used to regulate the signal at a median radius value.
6. A method for determining a constellation of a quadrature amplitude modulated signal (s) from a plurality of possible constellations, comprising:
converting, using a converter, the signal from a Cartesian coordinate space into polar coordinates (e, Φ) which includes a radial component representative of a radius (r) as the radial component of the signal (s), and
determining, using a constellation identification device, the constellation of the signal from the radius (r).
7. The method according to claim 6 , wherein a CORDIC is used for conversion.
8. The method according to claim 6 , wherein the radius is read prior to being supplied to a discriminator and furnished for determining the constellation.
9. The method according to claim 8 , wherein determining the constellation includes generating constellation information, and further comprising using the constellation information for determining a symbol.
10. The method according to claim 6 , further comprising normalizing the signal to a median radius value.
11. The method according to claim 6 , wherein determining the constellation is based various radial distributions of the possible constellations.
12. The method according to claim 11 , wherein the constellation is determined using a correlation to correlation patterns of a set of possible correlations.
13. The method according to claim 11 , wherein the constellation is determined with the count of the bin populations of predetermined amplitude regions relative to other amplitude regions.
14. The device according claim 1 wherein the plurality of possible constellations includes QPSK, 16 QAM, 32 QAM, 128 QAM or 512 QAM.
15. The method according to claim 6 wherein the plurality of possible constellations includes QPSK, 16 QAM, 32 QAM, 128 QAM or 512 QAM.