Receiver comprising a device for correcting doppler effect
AssigneeST-Ericsson SA
InventorChristophe Del-Toso
Life of this patent
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Abstract
A OFDM digital communication receiver having channel estimate and correction means and inter carrier interference cancellation means based on the use of a temporal digital filter comprising a set of digital coefficients. The receiver includes Look-Up Tables LUT(n), each corresponding to a given set of digital coefficients and an entry pointer.
Claims46
An OFDM digital communication receiver to receive signals transmitted on N carriers assigned to respective frequency bands, the receiver comprising:
- means for storing n Look-Up Tables LUT(n), each table corresponding to a given set of determined digital coefficients, wherein the sets of coefficients are a function of:
- a mathematical model of Doppler spectrum;
- a Doppler frequency;
- and
- a signal to noise ratio, wherein each table comprises an entry pointer;
- means for selecting an entry pointer based on information related to a speed of the receiver with respect to a terrestrial reference frame;
- channel estimation means for selecting a set of coefficients from an table LUT(n) corresponding to the selected entry pointer;
- and
- means for filtering a digital signal based on the selected set of coefficients.
A method of controlling communications in a communications system having a receiver with at least one processor, the method comprising:
- storing in the receiver a set of look-up tables of sets of digital coefficients, wherein the stored sets of digital coefficients are a function of a mathematical model of Doppler spectrum, a Doppler frequency and a signal to noise ratio;
- selecting, under control of the at least one processor, a set of coefficients from a table in the set of tables based on speed information;
- and
- filtering a digital signal based on the selected set of coefficients.
A communication device comprising:
- a global positioning block configured to generate speed information;
- a Doppler compensation controller configured to select a set of coefficients from stored sets of coefficients based on the generated speed information;
- and
- a channel estimation and control block configured to compensate for a Doppler effect based on the selected set of coefficients.
A communication system comprising:
- at least one base station;
- a transceiver, including:
- a global positioning block configured to generate speed information;
- a Doppler compensation controller configured to select a set of coefficients from stored sets of coefficients based on the generated speed information;
- and
- a channel estimation and control block configured to compensate for a Doppler effect based on the selected set of coefficients.
A tangible computer-readable media whose contents cause at least one processor in a communications system to perform a method of controlling communications, the method comprising:
- storing, in a receiver of the communication system, sets of digital coefficients, wherein the stored sets of digital coefficients are a function of a mathematical model of Doppler spectrum, a Doppler frequency and a signal to noise ratio;
- selecting, under control of the at least one processor, a set of coefficients from the stored sets of coefficients based on information related to a speed of the receiver;
- and
- compensating, under control of the at least one processor, for a Doppler effect based on the selected set of coefficients.
Dependencies are inferred from the claim text.