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1. WO2011054762 - ESTIMATION DE CANAL DANS UN ÉQUIPEMENT DE RÉCEPTEUR OFDM

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CLAIMS

1. A method of operating a receiver to receive data conveyed on an

Orthogonal Frequency Division Multiplexed (OFDM) signal transmitted on a plurality of sub-carriers, the method comprising:

ascertaining which of the plurality of sub-carriers have a channel quality that satisfies one or more criteria;

operating the receiver to select sub-carriers at least in part on whether the sub-carriers have the channel quality that satisfies one or more criteria; and

fully processing data streams only from the selected sub-carriers, wherein fully processing data streams comprises sub-carrier channel estimation or sub-carrier equalization or both sub-carrier channel estimation and sub-carrier equalization.

2. The method of claim 1, wherein operating the receiver to select sub-carriers at least in part on whether the sub-carriers have the channel quality that satisfies one or more criteria comprises operating the receiver to select only those sub-carriers having the channel quality that satisfies the one or more criteria.

3. The method of claim 1, wherein ascertaining which of the plurality of sub-carriers have a channel quality that satisfies one or more criteria comprises:

for each of the plurality of sub-carriers, ascertaining a measure of sub-carrier quality and comparing the measure of sub-carrier quality with a threshold quality level.

4. The method of claim 3, comprising:

setting the threshold quality level as a function of a predetermined target level of processing savings.

5. The method of claim 1, wherein:

operating the receiver to select sub-carriers at least in part on whether they have the channel quality that satisfies one or more criteria comprises storing a list of selected sub-carriers; and

fully processing data streams only from the selected sub-carriers comprises retrieving at least a portion of the stored list and using the retrieved at least a portion of the stored list to at least in part control which of the plurality of sub-carriers data streams will be fully processed.

6. The method of claim 1, wherein:

operating the receiver to select sub-carriers at least in part on whether the sub-carriers have the channel quality that satisfies one or more criteria comprises storing a list of those sub-carriers that do not have a channel quality that satisfies the one or more criteria; and

fully processing data streams only from the selected sub-carriers comprises operating the receiver to retrieve at least a portion of the stored list and using the retrieved at least a portion of the stored list to at least in part control which of the plurality of sub-carriers data streams will be fully processed.

7. The method of claim 1, comprising:

setting the one or more criteria based on a predetermined level of computational complexity reduction.

8. The method of claim 1, comprising:

setting the one or more criteria such that a level of receiver performance will not fall below a predetermined level of performance degradation.

9. The method of claim 1, wherein:

the receiver comprises a data stream processing resource; and

the method comprises operating the data stream processing resource to receive a data stream transmitted in accordance with a first radio communication standard, and concurrently operating the data stream processing resource to receive a data stream transmitted in accordance with a second

radio communication standard.

10. The method of claim 1, wherein:

operating the receiver to select sub-carriers at least in part on whether the sub-carriers have the channel quality that satisfies one or more criteria comprises generating a bit mask comprising a plurality of bits, each of which indicates whether a respective one or a respective set of the plurality of sub-carriers is selected or not selected; and

fully processing data streams only from the selected sub-carriers comprises using the bit mask to selectively enable or disable full data stream processing from a respective one or a respective set of the sub-carriers.

11. An apparatus for operating a receiver to receive data conveyed on an

Orthogonal Frequency Division Multiplexed (OFDM) signal transmitted on a plurality of sub-carriers, the apparatus comprising:

circuitry configured to ascertain which of the plurality of sub-carriers have a channel quality that satisfies one or more criteria;

circuitry configured to operate the receiver to select sub-carriers at least in part on whether the sub-carriers have the channel quality that satisfies one or more criteria; and

circuitry configured to fully process data streams only from the selected sub-carriers, wherein fully processing data streams comprises sub-carrier channel estimation or sub-carrier equalization or both sub-carrier channel estimation and sub-carrier equalization.

12. The apparatus of claim 11, wherein the circuitry configured to operate the receiver to select sub-carriers at least in part on whether the sub-carriers have the channel quality that satisfies one or more criteria comprises circuitry configured to operate the receiver to select only those sub-carriers having the channel quality that satisfies the one or more criteria.

13. The apparatus of claim 11, wherein the circuitry configured to ascertain which of the plurality of sub-carriers have a channel quality that satisfies one or more criteria comprises:

circuitry configured to ascertain, for each of the plurality of sub-carriers, a measure of sub-carrier quality and to compare the measure of sub-carrier quality with a threshold quality level.

14. The apparatus of claim 13, comprising:

circuitry configured to set the threshold quality level as a function of a predetermined target level of processing savings.

15. The apparatus of claim 11, wherein:

the circuitry configured to operate the receiver to select sub-carriers at least in part on whether they have the channel quality that satisfies one or more criteria comprises circuitry configured to store a list of selected sub-carriers; and the circuitry configured to fully process data streams only from the selected sub-carriers comprises circuitry configured to retrieve at least a portion of the stored list and to use the retrieved at least a portion of the stored list to at least in part control which of the plurality of sub-carriers data streams will be fully processed.

16. The apparatus of claim 11, wherein:

the circuitry configured to operate the receiver to select sub-carriers at least in part on whether the sub-carriers have the channel quality that satisfies one or more criteria comprises circuitry configured to store a list of those sub-carriers that do not have a channel quality that satisfies the one or more criteria; and

the circuitry configured to fully process data streams only from the selected sub-carriers comprises circuitry configured to operate the receiver to retrieve at least a portion of the stored list and to use the retrieved at least a portion of the stored list to at least in part control which of the plurality of sub-carriers data streams will be fully processed.

17. The apparatus of claim 11, comprising:

circuitry configured to set the one or more criteria based on a

predetermined level of computational complexity reduction.

18. The apparatus of claim 11, comprising:

circuitry configured to set the one or more criteria such that a level of receiver performance will not fall below a predetermined level of performance degradation.

19. The apparatus of claim 11, comprising:

a data stream processing resource; and

circuitry configured to operate the data stream processing resource to receive a data stream transmitted in accordance with a first radio communication standard, and to concurrently operate the data stream processing resource to receive a data stream transmitted in accordance with a second

radiocommunication standard.

20. The apparatus of claim 11, wherein:

the circuitry configured to operate the receiver to select sub-carriers at least in part on whether the sub-carriers have the channel quality that satisfies one or more criteria comprises circuitry configured to generate a bit mask comprising a plurality of bits, each of which indicates whether a respective one or a respective set of the plurality of sub-carriers is selected or not selected; and

the circuitry configured to fully process data streams only from the selected sub-carriers comprises circuitry configured to use the bit mask to selectively enable or disable full data stream processing from a respective one or a respective set of the sub-carriers.

21. The apparatus of claim 11, wherein the apparatus is configured to operate as part of a user equipment.