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US 7,412,011 B2Granted
Joint ratio estimation and weights detection in closed loop transmit diversity
AssigneeTexas Instruments Incorporated
InventorTao Luo
Life of this patent
Estimating the term…
Abstract
A communications device configured to extract weighting factors from incoming signals received from two or more antennas while estimating a channel ratio for the signals. The device includes at least one antenna and a digital signal processor. The method includes receiving two signals and extracting the weighting factors while estimating the channel ratio.
Claims59
A device, comprising:
- at least one antenna capable of receiving a first signal from a first antenna and a second signal from a second antenna;
- and
- a digital signal processor configured to extract a first weighting factor and a second weighting factor from the first signal and the second signal while estimating a channel ratio for the first signal and the second signal, and to perform signal combining using the first weighting factor and the second weighting factor;
- wherein the channel ratio being estimated comprises a channel gain ratio between dedicated pilot symbols and common pilot symbols.
1 more element
A device, comprising:
- at least one antenna means capable of receiving a first signal from a first antenna and a second signal from a second antenna;
- means for extracting a first weighting factor and a second weighting factor from the first signal and the second signal while estimating a channel ratio for the first signal and the second signal;
- and
- means for performing signal combining using the first weighting factor and the second weighting factors
- wherein the channel ratio being estimated comprises a channel gain ratio between dedicated pilot symbols and common pilot symbols.
2 more elements
A communications system, comprising:
- a base station, comprising:
- a first antenna configured to transmit a first signal using a first weighting factor;
- and
- a second antenna configured to transmit a second signal using a second weighting factor;
- and
- a device, comprising:
- at least one antenna capable of receiving the first signal from the first antenna and the second signal from the second antenna;
- and
- a digital signal processor configured to extract a first weighting factor and a second weighting factor from the first signal and the second signal while estimating a channel ratio for the first signal and the second signal, and to perform signal combining using the first weighting factor and the second weighting factor;
- wherein the channel ratio being estimated comprises a channel gain ratio between dedicated pilot symbols and common pilot symbols.
7 more elements
A method for improving communications, the method comprising:
- receiving a first signal and a second signal;
- extracting a first weighting factor and a second weighting factor from the first signal and the second signal while estimating a channel ratio for the first signal and the second signal;
- and
- performing signing combining using the first weighting factor and the second weighting factor;
- wherein the channel ratio being estimated comprises a channel gain ratio between dedicated pilot symbols and common pilot symbols.
2 more elements
Dependencies are inferred from the claim text.