Patent ID: 8111608

Claim:
A radio-communication device for performing a packet-reception processing in a communication environment in which an OFDM (Orthogonal Frequency Division Multiplexing) modulation method is used and where packets generated in different formats traffic, a number of tones of a subcarrier included in a single OFDM symbol differing for each of the different formats in at least a packet field, the radio-communication device comprising: a signal-reception unit configured to receive a MIMO (Multi Input Multi Output) signal including a plurality of multiplexed spatial streams from a packet-transmission source via an antenna, a predetermined time difference being set between the spatial streams; a data-decoding unit configured to decode the MIMO signal received by the signal-reception unit, when the predetermined time difference is less than a predetermined difference value; a data-processing unit configured to process data decoded by the data-decoding unit; a format-determination unit configured to determine, based on a relative phase difference between a previous packet field and a subsequent packet field adjacent to the previous packet field, a packet format of the MIMO signal received by the signal-reception unit; and a control unit configured to stop an operation of the data-decoding unit when the data-processing unit does not support the packet format, which is determined by the format-determination unit, the operation being performed in a field that comes after a field at which the format-determination unit determines the packet format.