A wireless communication system comprising: a base station device (100a, 100b); and a mobile station device (200, 200a) configured to communicate with the base station device, wherein the base station device comprises: a reference signal generator configured to generate a reference signal; and a radio transmitter (108a - 108m) configured to transmit to the mobile station device, the reference signal generated by the reference signal generator, the mobile station device comprises: a measurer (221, 222) configured to measure, using the reference signal transmitted from the base station device, a state of a channel between the mobile station device and the base station device; and a feedback information generator configured to generate feedback information based on a result of a measurement performed by the measurer, the wireless communication system characterized in that the mobile station device is configured to measure according to control information reported from the base station device, using the reference signal transmitted from the base station device, one of a state of the channel including an interference due to a signal transmitted from another base station device and a state of the channel, wherein the measurer (221, 222) is configured to measure, based on a despreading process for the reference signal, the state of the channel wherein the interference is suppressed and to generate the feedback information based on the result of the measurement. a base station device (100a, 100b); and a mobile station device (200, 200a) configured to communicate with the base station device, wherein the base station device comprises: a reference signal generator configured to generate a reference signal; and a radio transmitter (108a - 108m) configured to transmit to the mobile station device, the reference signal generated by the reference signal generator, a reference signal generator configured to generate a reference signal; and a radio transmitter (108a - 108m) configured to transmit to the mobile station device, the reference signal generated by the reference signal generator, the mobile station device comprises: a measurer (221, 222) configured to measure, using the reference signal transmitted from the base station device, a state of a channel between the mobile station device and the base station device; and a feedback information generator configured to generate feedback information based on a result of a measurement performed by the measurer, the wireless communication system characterized in that the mobile station device is configured to measure according to control information reported from the base station device, using the reference signal transmitted from the base station device, one of a state of the channel including an interference due to a signal transmitted from another base station device and a state of the channel, wherein the measurer (221, 222) is configured to measure, based on a despreading process for the reference signal, the state of the channel wherein the interference is suppressed and to generate the feedback information based on the result of the measurement. a measurer (221, 222) configured to measure, using the reference signal transmitted from the base station device, a state of a channel between the mobile station device and the base station device; and a feedback information generator configured to generate feedback information based on a result of a measurement performed by the measurer, the wireless communication system characterized in that the mobile station device is configured to measure according to control information reported from the base station device, using the reference signal transmitted from the base station device, one of a state of the channel including an interference due to a signal transmitted from another base station device and a state of the channel, wherein the measurer (221, 222) is configured to measure, based on a despreading process for the reference signal, the state of the channel wherein the interference is suppressed and to generate the feedback information based on the result of the measurement.