US 7,606,334 B2 · Channel estimation using pilot symbols

Abstract

A system for estimating the transfer function of a transmission channel such as the downlink channel in a CDMA system over which a pilot signal and a data signal are transmitted. The system includes at least one estimator for producing first and second channel estimates from the pilot signal and the data signals and a combination node for combining the first and second channel estimates to obtain final combined channel estimates. The system includes an interpolator module adapted for interpolating the second channel estimates over a basic estimation reference time to produce equal numbers of channel estimates over the basic estimation reference time derived from the data signal and the pilot signal respectively, and possibly rate adaptation modules adapted for mapping the channel estimates on the basic estimation reference time. The combination node is a summation node producing the final combined channel estimates as a sum of the first channel estimates and the interpolated second channel estimates.

Claims34

Dependent claims

A method for estimating in a mobile telecommunications terminal a transfer function of a transmission channel over which a pilot signal and a data signal are transmitted to the terminal, said pilot signal comprising sets of known symbols each transmitted over a given time slot, and said data signal comprising dedicated pilot fields comprising respective sets of known symbols each transmitted over a respective time slot, comprising, within the mobile telecommunications terminal:

obtaining first and second channel estimates from said pilot signal and said data signal, respectively, received by the terminal;
combining said first and second channel estimates to obtain final combined channel estimates;
obtaining said first and second channel estimates over a basic estimation reference time;
interpolating said second channel estimates over said basic estimation reference time to produce a number of interpolated second channel estimates over said basic estimation reference time derived from said data signal equal to the number of said first channel estimates over said basic estimation reference time derived from said pilot signal;
and
obtaining said final combined channel estimates as a sum of said first channel estimates and said interpolated second channel estimates.

3 more elements

A system for estimating the transfer function of a transmission channel over which a pilot signal and a data signal are transmitted, said pilot signal comprising sets of known symbols each transmitted over a given time slot, and said data signal comprising dedicated pilot fields comprising respective sets of known symbols each transmitted over a respective time slot, comprising:

at least one estimator for producing first and second channel estimates from said pilot signal and said data signal, respectively;
a combination node for combining said first and second channel estimates to obtain final combined channel estimates, said at least one estimator being configured for obtaining said first and second channel estimates over a basic estimation reference time;
and
an interpolator module for interpolating said second channel estimates over said basic estimation reference time to produce a number of interpolated second channel estimates over said basic estimation reference time derived from said data signal equal to the number of said first channel estimates over said basic estimation reference time derived from said pilot signal, said combination node being a summation node producing said final combined channel estimates as a sum of said first channel estimates and said interpolated second channel estimates.

1 more element

Dependencies are inferred from the claim text.

Channel estimation using pilot symbols

Life of this patent

Channel estimation using pilot symbols

Life of this patent

Abstract

Claims34