Device and method for determining a symbol during reception of a signal coupled with a quadrature signal pair (I,Q) for QAM frequency control and/or rotation control
View Patent ↗The invention relates to a device and a method for determining a symbol during reception of a signal coupled with a quadrature signal pair having a discriminator for the determination of a symbol with an analysis of a received signal in complex coordinate space, and a control loop for QAM frequency control and/or rotation control while control parameters are used, which are constructed and/or controlled depending on at least one of the symbols to be decided by the discriminator so that the control parameters are adjusted for decisions to be taken later, wherein one weighting device is constructed and/or controlled, providing in each case one weighting value for the symbols to be decided and/or decided by the discriminator among a plurality of weighting values depending on the symbol position in the complex coordinate space for the control loop.
1. A device for determining a symbol during reception of a quadrature signal pair-coupled signal, comprising:
a discriminator, configured to determine the symbol based on an analysis of a received signal in a complex coordinate space;
a control loop for at least one of quadrature amplitude modulation (QAM) frequency control and rotation control wherein control parameters are used, the control loop controlled depending on at least one symbol determined by the discriminator to adjust the control parameters for symbol decisions to be made later;
a weighting values device configured to provide a plurality of weighting values, each weighting value associated with a corresponding symbol determined by the discriminator or to be determined by the discriminator, each weighting value depending on a position of the corresponding symbol in the complex coordinate space;
a first weighting device configured as a constituent part of a rotation control device to weight a phase offset with a corresponding weighting value;
a second weighting device configured to apply weighting with one of the plurality of weighting values to a control value for a carrier control device;
wherein the first weighting device is configured to:
generate a rotation signal, and
furnish to the second weighting device an additional weighting value, which is used as another, delayed weighting value to apply additional weighting to the control value.
2. The device according to claim 1 , wherein the weighting values device is configured to provide each weighting value for weighting at least one of a phase offset signal and a rotation control signal.
3. The device according to claim 1 , wherein the first weighting device is configured to apply weighting with one of the plurality of weighting values to the control value for the carrier control device.
4. The device according to claim 1 , wherein the weighting device is configured to assign to each symbol one of the plurality of weighting values depending on a radius of the symbol in the complex coordinate space.
5. The device according to claim 1 , wherein the weighting device is configured to assign to each symbol one of the plurality of weighting values depending on the position of the symbol in the complex coordinate space.
6. The device according to claim 1 , wherein the weighting values are stored in a memory block as a table.
7. The device according to claim 6 , wherein the weighting values can be provided from the table created as a two-dimensional or more-dimensional table.
8. A method for determining a symbol during reception of a quadrature signal pair-coupled signal using at least one of quadrature amplitude modulation (QAM) frequency control and rotation control, the method comprising:
determining a plurality of symbols using a discriminator based on control parameters;
adjusting the control parameters depending on at least one determined symbol, for symbol decisions to be made later, and
providing a weighting value corresponding to each symbol determined by the discriminator or to be determined by the discriminator to generate a plurality of weighting values, each weighting value depending on a position of the corresponding symbol in a complex coordinate space;
weight a phase offset with a corresponding weighting value with a first weighting device configured as a constituent part of a rotation control device;
apply weighting with one of the plurality of weighting values to a control value for a carrier control device with a second weighting device;
wherein the first weighting device is configured to:
generate a rotation signal, and
furnish to the second weighting device an additional weighting value, which is used as another, delayed weighting value to apply additional weighting to the control value.
9. The method according claim 8 , wherein at least one weighting value is used for weighting of at least one of a phase offset signal and a rotation control signal.
10. The method according to claim 8 , wherein the plurality of the weighting values are provided in a table and made available for each of a plurality of symbol alphabets.
11. The method according to claim 8 , wherein the weighting values are provided in a table such that the weighting values are adjusted to a synchronization progression of a frequency control.
12. The method according to claim 8 , wherein one phase offset, one rotation value, or both, is weighted with two or more weighting values.
13. The device according to claim 3 , further comprising the second weighting device configured as a constituent part of a rotation control filter.