Radio communication device with more channel capacity and less feedback information, and method therefor

A radio communication apparatus having maximized channel capacity and a method therefor are provided. This radio communication apparatus includes a transmitter for allocating transmission power of each of base-band signals of each transmitting antenna containing an information signal input from outside, using feedback information recovered from a feedback signal, modulating the base-band signals with the allocated transmission power, and converting the base-band signals into RF signals and transmitting the RF signals; and a receiver for estimating a channel response experienced during the transmission of the received RF signals, recovering the information signal from the RF signals using the estimated channel response, and transmitting information regarding the transmission power, which is calculated based on the estimated channel response and is to be allocated, as the feedback signal to the transmitter by radio. In this radio communication apparatus with maximized channel capacity and the method, only information on the amount of transmission power to be allocated to first transmitting antennae is fed back. Therefore, the channel capacity can be maximized while minimizing the amount of information in a feedback signal. Further, decoupling conversion is not required, thereby reducing the size and cost of manufacturing hardware.