Patent ID: 7327812

Claim:
Apparatus for estimating a plurality of channels from a plurality of distinct transmitting points to a receiving point, wherein an input signal includes a superposition of a first signal based on a first pilot sequence transmittable from a first transmitting point and a second signal based on a second pilot sequence transmittable from a second transmitting point, the first pilot sequence and the second pilot sequence being orthogonal to each other within a predetermined orthogonality range and having a phase shift to each other, comprising: a transformer for transforming the input signal into a transformed signal having a set of discrete values, the transformer being operative to translate the phase shift between the first and the second pilot sequence into a delay, so that a first group of the set of the discrete values includes channel information of a first channel from the first transmitting point to the receiving point and that a second group of the set of discrete values includes channel information of a second channel from the second transmitting point to the receiving point; a selector for selecting the first group from the set of discrete values and for selecting the second group from the set of discrete values to obtain selected groups; and a processor for determining channel information for the plurality of channels based on the selected groups.