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US 8,094,732 B2Granted
Method and device for estimating a multicarrier signal propagation channel
AssigneeTdf
InventorsBruno Jahan, Pierrick Louin
Life of this patent
Estimating the term…
Abstract
A method is provided for estimating a propagation channel composed of successive symbols of a multicarrier signal, each comprising at least one reference pilot and a plurality of data-carrying frequencies. Such a method comprises, in particular, at least one step consisting of correcting the at least one reference pilot on the basis of a first estimation of a propagation channel, in order to provide a second, more precise estimation of the channel.
Claims14
Process comprising:
- estimating a propagation channel formed by successive symbols of a multi-carrier signal, each symbol comprising at least one reference pilot and a plurality of frequencies carrying data, wherein estimating comprises:
- extracting said at least one reference pilot present in each of said symbols;
- and
- for each of said symbols:
- obtaining a first estimate of said propagation channel, by time/frequency interpolation on said extracted at least one reference pilot;
- independently correcting each of said at least one reference pilot, in phase and amplitude, and as a function of said first estimate, to output a corrected pilot with phase and amplitude correction, said correction step including a step to calculate an amplitude and phase error vector for each of said at least one reference pilot;
- and
- obtaining a second estimate of said propagation channel, by analysis of said corrected pilot.
5 more elements
A device comprising:
- means for estimating a propagation channel formed of successive symbols of a multi-carrier signal, each symbol comprising at least one reference pilot, and a plurality of data carrier frequencies, the means for estimating comprising:
- means for extracting said at least one reference pilot present in each of said symbols;
- and
- means for obtaining estimates of said propagation channel, which comprises, for each of said symbols:
- making a first estimate of said propagation channel, by time/frequency interpolation on said extracted at least one reference pilot;
- independently correcting each of said at least one reference pilot, in phase and amplitude, as a function of said first estimate, to output at least one corrected pilot with phase and amplitude correction, said correction step including a step to calculate an amplitude and phase error vector for each of said at least one reference pilot;
- and
- making a second estimate of said propagation channel, by analysis of said at least one corrected pilot with phase and amplitude correction.
5 more elements
A device comprising:
- a channel estimator device configured to estimate a propagation channel formed of successive symbols of a multi-carrier signal, each symbol comprising at least one reference pilot, and a plurality of data carrier frequencies, the channel estimator device comprising:
- an extraction element, which extracts the at least one reference pilot present in each of said symbols;
- and
- a first estimation element, which makes a first estimate of the propagation channel, for each of said symbols, by time/frequency interpolation on the extracted at least one reference pilot;
- a correction element, which for each of said symbols independently corrects the at least one reference pilot, in phase and amplitude, as a function of the first estimate, to output at least one corrected pilot with phase and amplitude correction, said correction step including a step to calculate an amplitude and phase error vector for each of said at least one reference pilot;
- and
- a second estimation element, which for each of said symbols makes a second estimate of said propagation channel, by analysis of the at least one corrected pilot with phase and amplitude correction.
4 more elements
A process comprising:
- estimating a propagation channel formed by successive symbols of a multi-carrier signal, each symbol comprising at least one reference pilot and a plurality of frequencies carrying data, wherein estimating comprises:
- extracting said at least one reference pilot present in each of said symbols;
- and
- for each of said symbols:
- obtaining a first estimate of said propagation channel, by time/frequency interpolation on said extracted at least one reference pilot;
- independently correcting each of said at least one reference pilot, in phase and amplitude, and as a function of said first estimate, to output a corrected pilot with phase and amplitude correction, said correction step including a step to calculate an amplitude and phase error vector for each of said at least one reference pilot, which comprises a preliminary step in which said pilots with an amplitude less than a first predetermined minimum average threshold and/or greater than a second predetermined maximum average threshold are rejected;
- and
- obtaining a second estimate of said propagation channel, by analysis of said corrected pilot.
5 more elements
Dependencies are inferred from the claim text.