Channel estimation in OFDM receiver equipment
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorsLeif Wilhelmsson, Jim Svensson
Life of this patent
Estimating the term…
Abstract
A receiver is operated so as to receive data conveyed on an Orthogonal Frequency Division Multiplexed (OFDM) signal transmitted on a plurality of sub-carriers. Such operation includes ascertaining which of the plurality of sub-carriers have a channel quality that satisfies one or more criteria. Then, sub-carriers are selected based at least in part on whether they have the channel quality that satisfies one or more criteria. The receiver then fully processes 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.
Claims21
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, wherein each of the sub-carriers conveys a respective data stream, the method comprising:
- using one or more criteria to ascertain a reduced set of sub-carriers from the plurality of sub-carriers by not including one or more of the sub-carriers that do not have a channel quality that is sufficiently good such that full data stream processing will be performed;
- not performing channel estimation on the data streams from sub-carriers that are not included within the reduced set of sub-carriers and not performing equalization on the data streams from sub-carriers that are not included within the reduced set of sub-carriers;
- and
- performing at least one of sub-carrier channel estimation only on the data streams from the reduced set of sub-carriers and sub-carrier equalization only on the data streams from the reduced set of sub-carriers.
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, wherein each of the sub-carriers conveys a respective data stream, the apparatus comprising:
- circuitry configured to use one or more criteria to ascertain a reduced set of sub-carriers from the plurality of sub-carriers by not including one or more of the sub-carriers that do not have a channel quality that is sufficiently good such that full data stream processing will be performed;
- and
- circuitry configured to perform at least one of sub-carrier channel estimation only on the data streams from the reduced set of sub-carriers and sub-carrier equalization only on the data streams from the reduced set of sub-carriers,
- wherein the apparatus is configured to not perform channel estimation on the data streams from sub-carriers that are not included within the reduced set of sub-carriers and to not perform equalization on the data streams from sub-carriers that are not included within the reduced set of sub-carriers.
Dependencies are inferred from the claim text.