Patent ID: 7561637

Claim:
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.