APPARATUS AND METHOD FOR SEARCHING AVERAGE POWER LEVEL IN SYSTEM USING MULTI-LOOK-UP TABLE, CONCERNED WITH STABLY COMPENSATING FOR INPUT SIGNAL SO AS TO HAVE LINEAR CHARACTERISTICS

摘要

PURPOSE: An apparatus and method for searching an average power level in a system using a multi-look-up table are provided to stably compensate an input signal so as to have linear characteristics. CONSTITUTION: An average power input unit(100) reads a current average power value with respect to inputted I and Q signals in detecting a level of the current average power value by using a multi-look-up table. An average power fluctuation detector(200) determines an average power variation value with respect to the current average power value. A fluctuation tolerance range determining unit(400) determines whether the average power variation value comes within a certain tolerance range and outputs a fluctuation tolerance range determining signal. A current look-up index signal and previous average power value generator(300) outputs a stored previous look-up index signal as it is as a current look-up index signal, searches and outputs the current look-up index signal to which a level of the current average power value belongs and then stores the current look-up index signal as a previous look-up index signal, and changes the current average power value to the previous average power value and outputs it to the average power fluctuation detector(200).