Patent ID: 8130868

Claim:
A radio communication apparatus that communicates with first to mth (m is an integer of 2 or more) communication apparatuses by using first to hth (h is an integer of m or more) transmission antennas, comprising: first to mth signal generation units configured to generate first to mth signals to be transmitted to the first to mth communication apparatuses; an allocation information storage configured to store allocation information defining that beams of different quality levels are allocated to the first to mth communication apparatuses for each of first to nth (n is an integer of 2 or more) subcarriers so that frequencies of respective quality levels are substantially uniform over all the first to nth subcarriers among the first to mth communication apparatuses; first to nth weight determining units configured to determine transmission weights by which the first to mth signals are multiplied so that the beams of respective quality levels indicated in the allocation information are formed for the first to mth communication apparatuses for each of the first to nth subcarriers; first to nth weighted signal generation units configured to perform multiplication processing by using the first to mth signals and the transmission weights determined for each of the first to nth subcarriers to generate first to hth weighted signals for each of the first to nth subcarriers; first to hth inverse Fourier transform units configured to perform inverse Fourier transform on the first to hth weighted signals generated for each of the first to nth subcarriers to generate first to hth inverse Fourier transformed signals; and first to hth transmission processing units configured to transmit the first to hth inverse Fourier transformed signals via the first to hth transmission antennas.