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

• US 20080225992A1
• Filed: 12/28/2007
• Published: 09/18/2008
• Est. Priority Date: 12/29/2006
• Status: Active Grant

• Current Assignee: MaxLinear Communications, LLC (f/k/a Entropic Communications, LLC) (Maxlinear Incorporated)
• Original Assignee: Micronas Gmbh (TDK Corporation)
• Inventors: Bock, Christian
• Granted Patent: US 8,774,323 B2
• Time in Patent Office: Days
• US Class Current: 375/340
• CPC Class Codes: G05D 17/02 characterised by the use of electric means
• CPC Class Codes: H04L 2027/003 at baseband only
• CPC Class Codes: H04L 2027/0055 single phase
• CPC Class Codes: H04L 27/38 Demodulator circuits; Receiver circuits

Abstract

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.

Claims

1-15. -15. (canceled)

16. A device for determining a symbol during reception of a quadrature signal pair-coupled signal, comprising

a discriminator, configured to determine a symbol based on an analysis of a received signal (sa, sd) in a complex coordinate space;

a control loop for QAM control and/or rotation control wherein control parameters are used, the control loop controlled depending on at least one symbol D determined by the discriminator so as to adjust the control parameters for decisions to be taken later;

a weighting values device configured to provide in each case a weighting value for a symbol to be determined and/or a symbol determined by the discriminator to form a plurality of weighting values depending on the symbol position in a complex coordinate space for the control loop.

17. The device according claim 16, wherein the weighting values device is configured to provide the weighting value from a phase offset and/or a rotation control signal.

18. The device according claim 16, further comprising a weighting device configured to apply weighting with the weighting value to a control value for a carrier control device.

19. The device according to claim 16, wherein the weighting device is configured as a constituent part of a rotation control device, and is configured to weight a phase offset with the weighting value.

20. The device according to claim 18, wherein the weighting device is configured for the generation of the rotation signal, and furnishes to a second weighting device an additional weighting value, which is used as another, delayed weighting value to apply additional weighting to the control value.

21. The device according to claim 18, wherein a second weighting device is constructed as a constituent part of a phase offset filter.

22. The device according to claim 16, 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.

23. The device according to claim 16, wherein the weighting device is configured to assign to each symbol one of the plurality of weighting values depending on a position of the symbol in the complex coordinate space.

24. The device according to claim 16, wherein the weighting values are stored in a memory block as a table.

25. The device according to claim 24, wherein with the weighting value can be provided from the table created as a two-dimensional or more-dimensional table.

26. A method for determining a symbol during reception of a quadrature signal pair-coupled signal using QAM frequency control and/or rotation control, comprising

determining a symbol using a discriminator based on control parameters;

adjusting the control parameters depending on at least one determined symbol, for decisions to be taken later,

providing a weighting value for each of the symbols to be determined and/or determined by the discriminator to generate a plurality of weighting values depending on the symbol position in a complex coordinate space.

27. The method according claim 26, wherein at least one weighting value is used for weighting of a phase offset and/or a rotation control signal.

28. The method according to claim 26, wherein the plurality of the weighting values are provided in a table and made available for each of the various symbol alphabets of various pluralities of the weighting values.

29. The method according to one of the claim 26, wherein the weighting values are provided in a table such that the weighting values are adjusted to the synchronization progression of the frequency control.

30. The method according to one of the claim 26, wherein one phase offset and/or rotation value is weighted with two or more weighting values.