A radio reception apparatus comprising: a resource information acquiring section which is configured to acquire resource allocation information of a second reference signal, the second reference signal being used for a second communication system in addition to a first reference signal for a first communication system, the first reference signal being mapped in both the former half and latter half of symbols constituting a subframe, a number of antenna ports for the second communication system being greater than a number of antenna ports for the first communication system; a receiver which is configured to receive encoded data and the second reference signal transmitted from a transmission apparatus; and a channel quality measuring section which is configured to measure a channel quality by using the second reference signal, on the basis of the resource allocation information; and a feedback information transmitter which is configured to transmit feedback information containing channel quality information indicative of the channel quality, to the transmission apparatus, characterized in that the receiver is adapted to receive the encoded data, which is comprised of systematic bits first followed by parity bits, and to receive the second reference signal, which is mapped onto specific resources, namely to only a last two symbols of the subframe according to a mapping rule which is opposite in frequency direction and in time direction to a rule of mapping of the encoded data by starting from the last symbol of the subframe, wherein the channel quality measuring section is configured to measure the channel quality by using the second reference signal received in the specific resources a resource information acquiring section which is configured to acquire resource allocation information of a second reference signal, the second reference signal being used for a second communication system in addition to a first reference signal for a first communication system, the first reference signal being mapped in both the former half and latter half of symbols constituting a subframe, a number of antenna ports for the second communication system being greater than a number of antenna ports for the first communication system; a receiver which is configured to receive encoded data and the second reference signal transmitted from a transmission apparatus; and a channel quality measuring section which is configured to measure a channel quality by using the second reference signal, on the basis of the resource allocation information; and a feedback information transmitter which is configured to transmit feedback information containing channel quality information indicative of the channel quality, to the transmission apparatus, characterized in that the receiver is adapted to receive the encoded data, which is comprised of systematic bits first followed by parity bits, and to receive the second reference signal, which is mapped onto specific resources, namely to only a last two symbols of the subframe according to a mapping rule which is opposite in frequency direction and in time direction to a rule of mapping of the encoded data by starting from the last symbol of the subframe, wherein the channel quality measuring section is configured to measure the channel quality by using the second reference signal received in the specific resources <EOS>