METHOD AND SYSTEM FOR AN IMPROVED MIMO MODULATION CODING SET FEEDBACK SYSTEM

• US 20080107193A1
• Filed: 08/29/2007
• Published: 05/08/2008
• Est. Priority Date: 11/06/2006
• Status: Abandoned Application

• Current Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Inventors: Kent, Mark, Landau, Uri, Erceg, Vinko
• Application Number:
  US11/847,022
• Publication Number:
  US 20080107193A1
• Time in Patent Office: Days
• US Class Current: 375/260
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0029 Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling power control H04W52/04
• CPC Class Codes: H04L 1/0035 evaluation of received explicit signalling
• CPC Class Codes: H04L 1/06 using space diversity

Abstract

Aspects of a method and system for an improved MIMO modulation coding set feedback system may include determining, for each one of a plurality of spatial streams in a MIMO system, an index associated with an element of a modulation coding set, based on at least a reference index and an offset variable. The plurality of spatial streams may be modulated and coded, based on the determined index. A reference feedback variable may be fed back from a receiver to a transmitter in the MIMO system. The reference index may be determined based on at least the reference feedback variable. The offset variable for each one of the plurality of spatial streams may be fed back from a receiver to a transmitter in the MIMO system.

Claims

1. A method for processing communication signals, the method comprising:

determining, for each one of a plurality of spatial streams in a MIMO system, an index associated with an element of a modulation coding set, based on at least a reference index and an offset variable; and

coding and modulating said plurality of spatial streams, based on said determined index.

2. The method according to claim 1, comprising feeding back, from a receiver to a transmitter in said MIMO system, a reference feedback variable.

3. The method according to claim 1, comprising determining said reference index based on at least a reference feedback variable.

4. The method according to claim 1, comprising feeding back, from a receiver to a transmitter in said MIMO system, said offset variable for each one of said plurality of spatial streams.

5. The method according to claim 1, comprising selecting a modulation type for said modulating of each one of said plurality of spatial streams, based on said element of said modulation coding set associated with said index of each one of said plurality of spatial streams.

6. The method according to claim 1, comprising selecting a coding type for said coding of each one of said plurality of spatial streams, based on said element of said modulation coding set associated with said index of each one of said plurality of spatial streams.

7. The method according to claim 1, wherein said reference index is set to a value of a reference feedback variable.

8. The method according to claim 1, wherein said reference index is set to a value equal to a previous value of said reference index plus a reference feedback variable value.

9. The method according to claim 1, wherein said index is set to a value equal to said reference index plus said offset variable, for each one of said plurality of spatial streams.

10. The method according to claim 1, wherein said modulation coding set comprises about 16 of said elements.

11. The method according to claim 1, wherein said modulation coding set comprises between 8 and 32 of said elements.

12. The method according to claim 1, comprising generating said elements of said modulation coding set non-uniformly spaced with respect to spectral efficiency of said elements.

13. The method according to claim 1, comprising generating said elements of said modulation coding set uniformly spaced with respect to spectral efficiency of said elements.

26. The system according to claim 1, wherein said one or more circuits generate said elements of said modulation coding set uniformly spaced with respect to spectral efficiency of said elements.

14. A system for processing communication signals, the system comprising:

a MIMO system comprising one or more circuits, said one or more circuits enable;

determination, for each one of a plurality of spatial streams in said MIMO system, of an index associated with an element of a modulation coding set, based on at least a reference index and an offset variable; and

coding and modulation of said plurality of spatial streams, based on said determined index.

15. The system according to claim 14, wherein said one or more circuits feed back, from a receiver to a transmitter in said MIMO system, a reference feedback variable.

16. The system according to claim 14, wherein said one or more circuits determine said reference index based on at least a reference feedback variable.

17. The system according to claim 14, wherein said one or more circuits feed back, from a receiver to a transmitter in said MIMO system, said offset variable for each one of said plurality of spatial streams.

18. The system according to claim 14, wherein said one or more circuits select a modulation type for said modulating of each one of said plurality of spatial streams, based on said element of said modulation coding set associated with said index of each one of said plurality of spatial streams.

19. The system according to claim 14, wherein said one or more circuits select a coding type for said coding of each one of said plurality of spatial streams, based on said element of said modulation coding set associated with said index of each one of said plurality of spatial streams.

20. The system according to claim 14, wherein said reference index is set to a value of a reference feedback variable.

21. The system according to claim 14, wherein said reference index is set to a value equal to a previous value of said reference index plus a reference feedback variable value.

22. The system according to claim 14, wherein said index is set to a value equal to said reference index plus said offset variable, for each one of said plurality of spatial streams.

23. The system according to claim 14, wherein said modulation coding set comprises about 16 of said elements.

24. The system according to claim 14, wherein said modulation coding set comprises between 8 and 32 of said elements.

25. The system according to claim 14, wherein said one or more circuits generate said elements of said modulation coding set non-uniformly spaced with respect to spectral efficiency of said elements.