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US 7,352,799 B2Granted
Channel estimation in spread spectrum system
AssigneeNokia Corporation
InventorKari Pajukoski
Life of this patent
Estimating the term…
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:
- processing a spread spectrum signal containing user signals and received 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, wherein the combined correlation value is calculated by averaging the correlation values of a certain delay component that correspond to each other over two or more receiving antennas.
2 more elements
A method of estimating a radio channel in a radio system, comprising:
- processing a spread spectrum signal containing user signals and received 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, wherein the combined correlation value is used in determining parameters of the channel estimation filter.
2 more elements
A method of estimating a radio channel in a radio system, comprising:
- processing a spread spectrum signal containing user signals and received 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, wherein the width of the Doppler spectrum of the user signal is determined on the basis of the combined correlation values formed, and the speed of the terminal that formed the user signal is estimated on the basis of the Doppler spectrum width.
2 more elements
A method of estimating a radio channel in a radio system, comprising:
- processing a spread spectrum signal containing user signals and received 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, wherein the combined correlation value is calculated from signals received via two or more receiving antennas, the temporal difference between the signals being at most one chip of the spread code used in the formation of the spread spectrum signal.
2 more elements
A module of a radio receiver in a radio system comprising:
- a processing device configured to process for receiving a spread spectrum signal received via two or more receiving antennas and including user signals;
- a locating device configured to locate delay components of the user signal at different measurement moments;
- a correlating device configured to correlate channel coefficients of a certain delay component at different measurement moments with one another to form correlation values;
- a correlation value forming device configured to form 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
- an estimating device configured to use the combined correlation value formed to correct channel distortion and configured to estimate the channel used to transmit the user signal using the correlation values, wherein the correlation value forming device is configured to form the combined correlation value by averaging the correlation values of a certain delay component that correspond to each other over two or more receiving antennas.
3 more elements
A module of a radio receiver in a radio system comprising:
- a processing device configured to process for receiving a spread spectrum signal received via two or more receiving antennas and including user signals;
- a locating device configured to locate delay components of the user signal at different measurement moments;
- a correlating device configured to correlate channel coefficients of a certain delay component at different measurement moments with one another to form correlation values;
- a correlation value forming device configured to form 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
- an estimating device configured to use the combined correlation value formed to correct channel distortion and configured to estimate the channel used to transmit the user signal using the correlation values, wherein the estimation device is a channel estimation filter and the receiver is configured to use the combined correlation value in determining parameters of the channel estimation filter.
3 more elements
A module of a radio receiver in a radio system comprising:
- processing means for processing a spread spectrum signal received via two or more receiving antennas and 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;
- means for using 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, wherein the means for forming the combined correlation value forms the combined correlation value by averaging the correlation values of a certain delay component that correspond to each other over two or more receiving antennas.
4 more elements
A module of a radio receiver in a radio system comprising:
- processing means for processing a spread spectrum signal received via two or more receiving antennas and 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;
- means for using 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, wherein the means for estimating is a channel estimation filter and the receiver use the combined correlation value in determining parameters of the channel estimation filter.
4 more elements
Dependencies are inferred from the claim text.