Patent ID: 7027523

Claim:
In a time division duplexed (TDD) communication system, a method for transmitting data from a transmitter unit over a wireless communication link to a receiver unit, the method comprising: deriving a calibration function indicative of a difference between a first transfer function for a data transmission from the transmitter unit to the receiver unit and a second transfer function for a data transmission from the receiver unit to the transmitter unit; receiving via the communication link a first transmission from the receiver unit; estimating characteristics of the communication link based on the received first transmission; coding and modulating the data based on one or more coding and modulation schemes to provide modulation symbols; preconditioning the modulation symbols based on weights derived from the estimated characteristics of the communication link and the calibration function; and transmmitting the preconditioned modulation symbols from the transmitter unit via the communication link to the receiver unit.