Patent ID: 7292877

Claim:
An apparatus for calibrating and compensating for distortion of an output signal to an antenna in a mobile communication system with a smart antenna array, the apparatus comprising: a calibration signal generator for generating an extended Walsh code by extending a Walsh code used in the mobile communication system, and for generating a calibration signal using the extended Walsh code, wherein the extended Walsh code is configured as a first Walsh code having a fixed value in a code and the calibration signal is in synchronism with a Walsh code synchronization signal of the mobile communication system; a mobile communication signal generator for generating a traffic signal for forming a beam pattern to a position of a mobile terminal in communication; a multiplier for multiplying an error compensation value by an output signal of the mobile communication signal generator; an adder for adding an output signal of the calibration signal generator to an output of the multiplier; a radio frequency (RF) block for up-converting an output signal of the adder into an RF band signal, providing the up-converted RF band signal to the antenna array, extracting part of the signal provided to the antenna array, and feeding back the extracted signal component; and an error calibration and compensation value calculator for calibrating an error of the antenna array from the feedback signal, calculating a compensation value for compensating for the error, and providing the compensation value to the multiplier, wherein the calibration signal generator generates a calibration signal by calculating an extended Walsh length in accordance with the following equation: Extended Walsh length= n ·2 └log 2 N┘ where n denotes a Walsh length used in the system and N denotes the number of antennas in the antenna array.