Transmission power control parameter calculation method and device

A calculation device which calculates a transmission power control parameter by calculating a time average of power of amplitude of a transmission signal to calculate a reference value for control of transmission power of the transmission signal after multiplexing in a radio transmission system for multiplexing and transmitting a plurality of channel signals, the calculation device comprising:

• an operator performing a calculation of the time average of power of the amplitude of the transmission signal as a product-sum operation between a transmission power-dependent term including a modulation parameter depending on the transmission power of the transmission signal and a time average term including only a modulation parameter not depending on the transmission power of the transmission signal, and in a transmitting process of the transmission signal, inputting the modulation parameter depending on the transmission power of the transmission signal to calculate the transmission power-dependent term, reading a value of the time average term including only the modulation parameter not depending on the transmission power of the transmission signal, and performing the product-sum operation using a result of the calculation of the transmission power-dependent term and the read value of the time average term, thereby performing the time average of power of the amplitude of the transmission signal;
• and
• a coefficient memory storing a value of a time average term including only the modulation parameter not dependent on the transmission power of the transmission signal, and allowing the operator to read the stored value of the time average term when the transmission signal is transmitted.