Abstract: A transmission method is performed by a transmitter including antenna elements.

Abstract: A code multiplexer multiplexes spread data output from a spreader to generate code-multiplexed data. A reference data generator generates redundant data with constant power and with no information contained therein. A data adder adds the redundant data to the code-multiplexed data. A variable amplifier variably amplifies the transmit power of the code-multiplexed data and the redundant data to obtain transmit output data. A difference value calculator calculates a difference value between a target amplitude value and the amplitude of the amplified redundant data. A gain controller generates, based on the difference value, a gain control signal to control the gain of the variable amplifier. It is thereby possible to perform gain compensation with a small calculation amount and with high accuracy.

Abstract: Code multiplexing section 102 multiplexes spread data output from spreading sections 101-1 to 101-n to generate code-multiplexed data. Reference data generating section 103 generates redundant data with the constant transmit power and with no information contained therein. Data adding section 105 adds the redundant data to the code-multiplexed data. Variable amplifying section 108 variably amplifies the transmit power of the code-multiplexed data and of the redundant data to obtain transmit output data. Difference value calculating section 112 calculates a difference value between a target amplitude value based on the redundant data and the redundant data portion of the transmit output data. Gain control section 113 generates based on the difference value a gain control signal to control the gain of variable amplifying section 108. It is thereby possible to perform the gain compensation with a small calculation amount and with high accuracy.