Refinement of Channel Response Calculation

Apparatus for estimating for a wireless signal acquired by a receiver a channel response estimate having a set of potential tap positions, the apparatus comprising a measurement unit for calculating signal significance values for said signal for all positions in the set, a decision unit arranged to use signal significance values produced by the measurement means to determine if any of said positions should not be used to calculate the channel response estimate and an estimation unit for calculating the channel response estimate using said set less any positions excluded by the decision unit.

Apparatus for estimating for a wireless signal acquired by a receiver a channel response estimate having a set of potential tap positions, wherein the potential tap positions are treated as a vector and the apparatus comprises a decision unit for deducing a state of the vector that produces an acceptable value of an objective function having the vector as a parameter and a calculating unit for calculating the channel response estimate using those of the potential tap positions that are specified by the deduced state.

A method of estimating for a wireless signal acquired by a receiver a channel response estimate having a set of potential tap positions, the method comprising a measurement step of calculating signal significance values for said signal for all positions in the set, a selecting step arranged to use signal significance values produced by the measurement step to determine if any of said positions should not be used to calculate the channel response estimate and an estimation step of calculating the channel response estimate using said set less any positions excluded by the selecting step.

A method of estimating for a wireless signal acquired by a receiver a channel response estimate having a set of potential tap positions, wherein the potential tap positions are treated as a vector and the method comprises a step of deducing a state of the vector that produces an acceptable value of an objective function having the vector as a parameter and a step of calculating the channel response estimate using those of the potential tap positions that are specified by the deduced state.