Determination of a channel estimate of a transmission channel
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorsElias Jonsson, Johan Nilsson, Bengt Lindoff
Life of this patent
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Abstract
A method of determining a channel estimate of a first transmission channel in a communications system. The method comprises deriving a first set of channel estimates from symbols received through said first transmission channel; deriving a second set of channel estimates from symbols received through a second transmission channel in the communications system; determining a scale factor between the first and second sets of channel estimates from a least squares error criterion; and determining the channel estimate of the first transmission channel as a channel estimate of the second transmission channel scaled by the determined scale factor.
Claims21
A method in a device of determining a channel estimate of a first transmission channel in a communications system, the method comprising the device performing:
- a) deriving a first set of channel estimates from symbols received through said first transmission channel;
- b) deriving a second set of channel estimates from symbols received through a second transmission channel in the communications system;
- c) determining a scale factor between the first and second sets of channel estimates from a least squares error criterion;
- and
- d) determining the channel estimate of the first transmission channel as a channel estimate of the second transmission channel scaled by the determined scale factor,
- wherein determining the scale factor further comprises determining a minimum of an objective function, the objective function including an error term, said error term including a sum of error contributions each corresponding to one of a number of propagation delays, each of said error contributions corresponding to an error introduced by replacing the channel estimate of the first transmission channel by a channel estimate of the second transmission channel scaled by the scale factor.
A communications device for receiving communications signals via a transmission channel, the communications device comprising:
- means for deriving a first set of channel estimates from symbols received through a first transmission channel;
- means for deriving a second set of channel estimates from symbols received through a second transmission channel in the communications system;
- means for determining a scale factor between the first and second sets of channel estimates from a least squares error criterion;
- and
- means for determining the channel estimate of the first transmission channel as a channel estimate of the second transmission channel scaled by the determined scale factor,
- wherein the means for determining the scale factor is adapted to determine a minimum of an objective function, the objective function including an error term, said error term including a sum of error contributions each corresponding to one of a number of propagation delays, each of said error contributions corresponding to an error introduced by replacing the channel estimate of the first transmission channel by a channel estimate of the second transmission channel scaled by the scale factor.
A computer program product comprising program code means adapted to cause a processor to perform a method of determining a channel estimate of a first transmission channel in a communications system, the method comprising:
- a) deriving a first set of channel estimates from symbols received through said first transmission channel;
- b) deriving a second set of channel estimates from symbols received through a second transmission channel in the communications system;
- c) determining a scale factor between the first and second sets of channel estimates from a least squares error criterion;
- and
- d) determining the channel estimate of the first transmission channel as a channel estimate of the second transmission channel scaled by the determined scale factor,
- wherein determining the scale factor further comprises determining a minimum of an objective function, the objective function including an error term, said error term including a sum of error contributions each corresponding to one of a number of propagation delays, each of said error contributions corresponding to an error introduced by replacing the channel estimate of the first transmission channel by a channel estimate of the second transmission channel scaled by the scale factor.
Dependencies are inferred from the claim text.