Provided is a radio communication device which can suppress inter-code interference between an ACKNACK signal and a CQI signal which are code-multiplexed. At least one identifier for the function modules and data modules is stored in a respective conversion table belonging to each data processing unit. The refinement includes determination of spatial and temporal subspaces respectively comprising the actual directions of arrival of the signal among all distinguishable directions and the actual times of arrival of the signal among all distinguishable times of arrival, and the projection of the least squares estimate on said subspaces.