Channel estimator for OFDM system
AssigneeSony Deutschland GmbH
InventorsRichard Stirling-Gallacher, Zhaocheng Wang, Thomas Dölle
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Abstract
The present invention relates to a device for receiving signals in a wireless cellular OFDM system, in which data symbols are transmitted in frequency subcarriers and timeslots. The present invention further relates to a method for channel estimation in such a device. According to the present invention, a channel estimation on the basis of received pilot symbols is performed, whereby the channel estimation for data symbols between pilot symbols is performed by means of a filter, said filter being selected from a set of filters on the basis of an interference reference value.
Claims10
A device for receiving signals in a wireless cellular orthogonal frequency division multiplex (OFDM) system, in which data symbols are transmitted in frequency subcarriers and timeslots, comprising:
- a channel estimator configured to perform a channel estimation on the basis of received pilot symbols, the channel estimator including a filter selector configured to adaptively select a filter for channel estimation from a plurality of available filters based on an interference reference value supplied to the filter selector;
- and
- a filter configured to perform a channel estimation for data symbols between pilot symbols, said filter being further adaptively selected from the plurality of available filters on the basis of a Doppler frequency of the data symbol to be channel estimated, said channel estimation being based on an estimated carrier to interference value ratio, said estimated carrier being a wanted carrier power value at a frequency subcarrier and a timeslot of a data symbol to be channel estimated.
A method for channel estimation in a wireless cellular orthogonal frequency division multiplex (OFDM) system, in which data symbols are transmitted in frequency subcarriers and timeslots, comprising:
- performing a channel estimation on the basis of received pilot symbols;
- performing, adaptively, a filter selection for channel estimation by a filter selector, the filter selector selecting from a plurality of available filters based on an interference reference value supplied to the filter selector;
- and
- performing, by a filter, a channel estimation for data symbols between pilot symbols, said filter being further adaptively selected from the plurality of available filters based on a Doppler frequency of the data symbol to be channel estimated, said channel estimation being based on an estimated carrier to interference value ratio, the estimated carrier being a wanted carrier power value at a frequency subcarrier and a timeslot of a data symbol to be channel estimated.
Dependencies are inferred from the claim text.