Patent ID: 8401485

Claim:
A method for calibrating at least one impairment of a signal transmitted from a transmitting unit, the method comprising: receiving at a receiving unit at least two calibrating signals substantially simultaneously transmitted from the transmitting unit via two different transmit chain links of the transmitting unit, wherein each transmitting chain link includes at least a separate antenna and transmits a respective one of the two calibrating signals; estimating, at the receiving unit, based on the received at least two signals, at least one parameter associated with the two different transmit chain links of the transmitting unit, wherein the estimating further comprises repeatedly measuring a phase difference of the at least two signals over a predetermined time interval and determining a slope of measured phase differences when represented versus a frequency corresponding to the at least two signals, and assigning to the at least one parameter a value of the determined slope; collecting the at least one parameter in a measurement report at the receiving unit; and transmitting the measurement report from the receiving unit for correcting the at least one impairment related to the transmit chain links, based on the at least one parameter.