Patent ID: 8483038

Claim:
A radio communication apparatus used in a radio communication system configured to implement a frequency division multiple access method by using a frequency division multiplexing method as a modulation method and to divide each cell into at least one inner region and an outer region, the radio communication apparatus comprising: an allocation controller configured to allocate a perfectly-orthogonal channel as a subchannel available in the outer region, and to allocate a quasi-orthogonal channel as a subchannel available in the inner region, wherein the subchannels are groups into which a plurality of subcarriers are combined, and the allocation controller is configured to constitute a plurality of patterns as a combination pattern of the subchannels, perform subchannelization using the quasi-orthogonal channel which is configured to include some of subcarriers used in adjacent cells by allocating subchannels corresponding to different patterns from adjacent cells as an available subchannel in the inner region, and perform subchannelization using the perfectly-orthogonal channel which is configured not to include any subcarriers used in adjacent cells by allocating subchannels corresponding to the same pattern as adjacent cells as an available subchannel in the outer region.