Patent ID: 7688914
Filing Date: 2010-03-30
Classification: H03F,H04L

Abstract:
1. A distortion compensating device applied to a transmitter for transmitting a quadrature modulated signal in a wireless digital communication system, the distortion compensating device comprising: a phase adjusting unit configured to determine a phase adjustment value for a feedback signal subjected to a quadrature demodulation, based on a comparison between the feedback signal and a reference signal to be transmitted from the transmitter; a phase adjustment result storing unit configured to store a current phase adjustment result representing the determined phase adjustment value; a phase adjustment result comparison and determination unit configured to compare the current phase adjustment result with a previous phase adjustment result, and to output a comparison result; and a correction control unit configured to allow a correction for the quadrature modulation to be performed if the comparison result of the phase adjustment results satisfies a prescribed condition, wherein said correction control circuit increments a successful phase adjustment count if a difference between the current phase adjustment result and the previous phase adjustment result is within a predetermined range and performs the correction only if the successful phase adjustment count exceeds a prescribed value, and repeats incrementing the successful phase adjustment count and performing the correction until said correction is performed a target number of times, and wherein said prescribed condition is satisfied if said difference is within the predetermined range, the successful phase adjustment count exceeds said prescribed value, and the correction is performed said target number of times.