Patent ID: 8503579

Claim:
A channel estimator used in a receiver in a wireless system configured to receive a signal composed of frames arranged, each of the frames having a configuration in which a known pattern signal composed of a cyclically extended specific code sequence is periodically inserted, the known pattern signal having a fixed code length, the channel estimator comprising: a plurality of correlating sections configured to calculate a plurality of time correlation values between each of the frames of the received signal and a plurality of known pattern signals having different code lengths; an analyzing section configured to output a control signal representing a selected period for extracting a preferable correlation output from the output from each of the plurality of correlating sections; and a delay profile generating section configured to output a delay profile obtained by adaptively selecting or combining parts of the outputs from the plurality of correlating sections based on the control signal from the analyzing section; wherein the plurality of correlating sections are configured with first and second correlating sections, normalizing a first correlation output from the first correlating section with respect to a second correlation output from the second correlating section.