Apparatus for and method of controlling a predistorter, and method of detecting power control state

A method of detecting power control state for detecting whether a power amplifier is in a state of undergoing power control, the method comprising:

• registering a plurality of indices which are acquired within a predetermined time period, each representative of an output power of the power amplifier;
• acquiring a difference between a maximum value and a minimum value within the plurality of indices;
• determining, based on the difference, whether the power amplifier is in the state of undergoing power control;
• and
• outputting a signal indicating whether the power amplifier is in the state of undergoing power control.

An apparatus for controlling a predistorter for predistorting a signal input into a power amplifier, the apparatus comprising:

• a storing unit, for storing a predistortion coefficient used by the predistorter;
• an index registering unit, for acquiring indices representative of an output power of the power amplifier;
• a power control state detecting unit, for detecting, based on the indices acquired by the index registering unit, whether the power amplifier is in a state of undergoing power control;
• and
• a coefficient supplying unit, for obtaining the stored predistortion coefficient for supplying to the predistorter when the power control state detecting unit detects that the power amplifier is in the state of undergoing power control, and for supplying, when it is detected that the power amplifier is not in the state of undergoing power control, to the predistorter predistortion coefficients calculated by a unit that performs predistortion coefficient adaptive updating operation.