Patent ID: 6580772
Filing Date: 2003-06-17
Classification: H04B,H04L

Abstract:
A channel estimation method used in a CDMA radio system comprising at least one base station and several terminal equipments, the at least one base station and the several terminal equipments being configured to communicate with each other by transmitting and receiving signals, the method comprising:sampling a received signal and transmitting a pilot signal comprising at least one pilot symbol; forming a preliminary channel estimate by multiplying the sampled signal by a known complex conjugate of the at least one pilot symbol; forming at least one preliminary autocorrelation result from preliminary channel estimates that are successive in time; filtering the at least one preliminary autocorrelation by averaging so as to form an averaged autocorrelation result, and forming at least one filter parameter for filtration of an average channel estimate based on the averaged autocorrelation result; and forming the average channel estimate using channel estimate filtration, the channel estimate filtration being controlled by the at least one filter parameter.