Method and apparatus for transmitting data in a time division duplexed (TDD) communication system
First Claim
1. A method for wireless communication between a first unit and a second unit, comprising:
- calibrating at least one communication link between the first unit and the second unit to obtain a calibration function;
calculating a channel response estimate for the at least one communication link at least based on one or more pilots;
adjusting the channel response estimate at least based on the calibration function; and
processing modulated data, for transmission between the first and second units, using the adjusted channel response estimate.
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Accused Products
Abstract
Techniques to process data for transmission in a time division duplexed (TDD) communication system. In one aspect, the frequency response of a forward link is estimated at a base station based on reverse link transmissions (e.g., pilots) from a terminal. Prior to a data transmission on the forward link, the base station determines a reverse transfer function based on the pilots transmitted by the terminal, “calibrates” the reverse transfer function with a calibration function to derive an estimate of a forward transfer function, and preconditions modulation symbols based on weights derived from the forward transfer function. In another aspect, the terminal estimates the “quality” of the forward link and provides this information to the base station. The base station then uses the information to properly code and modulate data prior to transmission such that the transmitted data can be received by the terminal at the desired level of performance.
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Citations
18 Claims
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1. A method for wireless communication between a first unit and a second unit, comprising:
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calibrating at least one communication link between the first unit and the second unit to obtain a calibration function; calculating a channel response estimate for the at least one communication link at least based on one or more pilots; adjusting the channel response estimate at least based on the calibration function; and processing modulated data, for transmission between the first and second units, using the adjusted channel response estimate. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for wireless communication between a first unit and a second unit, comprising:
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logic for calibrating at least one communication link between the first unit and the second unit to obtain a calibration function; logic for calculating a channel response estimate for the at least one communication link at least based on one or more pilots; logic for adjusting the channel response estimate at least based on the calibration function; and logic for processing modulated data, for transmission between the first and second units, using the adjusted channel response estimate. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An apparatus for wireless communication between a first unit and a second unit, comprising:
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means for calibrating at least one communication link between the first unit and the second unit to obtain a calibration function; means for calculating a channel response estimate for the at least one communication link at least based on one or more pilots; means for adjusting the channel response estimate at least based on the calibration function; and means for processing modulated data, for transmission between the first and second units, using the adjusted channel response estimate. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification