Patent ID: 7098847

Claim:
A real-time calibration method for a smart antenna array including N reception and transmission links, each link including an antenna unit and a radio frequency transceiver connected via a feeder cable, each radio frequency transceiver connecting to a digital signal processor, wherein the method comprises: A) before installation, pre-calibrating the smart antenna array to obtain a pre-calibration transmission-coefficient matrix between antenna units in the smart antenna array; B) after installation at site, loading the pre-calibration transmission-coefficient matrix into a base station to which the smart antenna array connects; C) while the base station is running, transmitting a unit calibration signal in sequence in a time-slot for every transmitting link of the base station, and at the same time, non-transmitting links of the smart antenna array, are in a reception state to receive the unit calibration signal, then measuring and recording the received unit calibration signal; D) with the received unit calibration signal and pre-calibration transmission-coefficient matrix, respectively calculating a ratio of a receiving transmission-coefficient matrix of each receiving link to a receiving transmission-coefficient matrix of a reference link, and respectively calculating a ratio of transmitting transmission-coefficient matrix of each transmitting link to a transmitting transmission-coefficient matrix of the reference link.