method and system to estimate the transfer function of a transmission channel, and receiver to receive digital signals through a transmission channel

摘要

method and system to estimate the transfer function of a transmission channel, receiver to receive digital signals through a transmission channel, and, Computer program product chargeable in the memory of at least one computer a system to estimate the transfer function of a transmission channel such as the lower connection channel in a cdma system through which a pilot signal (p-cpich) and a data signal (dpch) are transmitted. the system includes: at least one estimator (21, 22, 27; 24, 23, 25) to produce first and second channel estimates of the pilot signal and data signal;and a combination node (26) to combine the first and second channel estimates to obtain final combined channel estimates. the system includes an interpolator (25) module adapted t o interpolate second channel estimates by means of a basic estimation reference time (t) to produce equal channel estimation numbers by means of the basic estimation time (t) derived from the data signal and pilot signal respectively, and possibly rate adjustment modules (23,27) adapted to map channel estimates in the basic estimation time (t). the combination node is a sum node (26) producing the final combined channel estimates as a sum (26) of the first channel estimates and second interpolated channel estimates.