Channel estimation in spread spectrum system
AssigneeNokia Corporation
InventorKari Pajukoski
Life of this patent
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Abstract
The invention relates to a receiver in a radio system, comprising two or more receiving antennas (300A-300B) for receiving a spread spectrum signal containing user signals, means for locating (200A-200B) delay components of the user signal at different measurement moments, means for forming (304) a combined correlation value from at least two correlation values of a certain delay component, the two correlation values being formed from signals received via different receiving antennas (300A-300B), and the estimation means (310) being configured to use the combined correlation value to correct channel distortion. The invention also relates to a method of receiving a signal.
Claims18
A method of estimating a radio channel in a radio system, comprising:
- receiving a spread spectrum signal containing user signals in a receiver of the radio system via at least two receiving antennas;
- forming channel estimates which describe delay components of the user signal at different measurement moments;
- correlating channel coefficients of a certain delay component at different measurement moments with each other to form correlation values, calculating, to correct the channel distortion, a combined correlation value from at least two correlation values of a certain delay component in the receiver, the correlation values being formed from signals received via different receiving antennas;
- and
- using the correlation values in correcting channel distortion.
A receiver in a radio system comprising:
- two or more receiving antennas for receiving a spread spectrum signal including user signals;
- means for locating delay components of the user signal at different measurement moments;
- means for correlating channel coefficients of a certain delay component at different measurement moments with one another to form correlation values;
- means for forming a combined correlation value from at least two correlation values of a certain delay component, the two correlation values being formed from signals received via different receiving antennas, and estimation means being configured to use the combined correlation value formed to correct channel distortion and
- means for estimating the channel used for transmitting the user signal using the correlation values.
Dependencies are inferred from the claim text.