Method for calibrating smart antenna array in real time

Abstract

The invention discloses a real-time calibration method for a smart antenna array. Said method can calibrate a TDD CDMA system and a FDD CDMA system with separated transmission and reception antenna arrays. The method comprises steps as follow: before installation, a smart antenna array is pre-calibrated to obtain transmission-coefficient matrix between antenna units; after installation at site, said pre-calibrated transmission-coefficient matrix is loaded in a base station to which said smart antenna array connects; during running, every transmission link of said base station transmits a unit calibration signal in sequence in a time-slot, and all other links, except said transmitting link, are in a reception state to receive said unit calibration signal, and said received unit calibration signals are recorded; with said received unit calibration signals and pre-calibrated transmission-coefficient matrix, a ratio of receiving transmission-coefficient matrix of reception links to receiving transmission-coefficient matrix of a reference link is calculated, respectively, and a ratio of transmitting transmission-coefficient matrix of transmission links to transmitting transmission-coefficient matrix of said reference link is calculated, respectively. The method does not need beacon antenna, coupled structure of the antenna array and a special calibration link.

Dependencies are inferred from the claim text.