Patent ID: 8265179

Claim:
A radio communication system employing a multi-carrier modulation/demodulation method, the radio communication system comprising: a data-transmission-side communication apparatus including a mapping unit that executes a mapping process with respect to a data sub-carrier based on a multipath delay time in a transmission path obtained by a predetermined estimating process, and a guard-band adding unit that changes a number of guard bands to be added to a signal on the data sub-carrier depending on information on the guard band obtained based on the multipath delay time such that the number of guard bands is a function of the multipath delay time obtained by the predetermined estimating process; and a data-reception-side communication apparatus including an equalizing unit that suppresses a multipath exceeding a guard interval or suppresses the multipath in a case where the guard interval is not added, based on the information on the guard band obtained based on the multipath delay time, and a demapping unit that executes a demapping process with respect to an equalized signal based on the multipath delay time, wherein the guard band is a sub-carrier whose transmitting content is known to the data-reception-side communication apparatus.