| US 7,580,446 B2 | ||
| Radio communication apparatus and radio communication method | ||
| Yasuhiko Tanabe, Kawasaki (Japan); and Shuichi Obayashi, Yokohama (Japan) | ||
| Assigned to Kabushiki Kaisha Toshiba, Tokyo (Japan) | ||
| Filed on Dec. 22, 2005, as Appl. No. 11/313,834. | ||
| Claims priority of application No. 2004-378092 (JP), filed on Dec. 27, 2004; and application No. 2005-364430 (JP), filed on Dec. 19, 2005. | ||
| Prior Publication US 2006/0153062 A1, Jul. 13, 2006 | ||
| Int. Cl. H04B 1/00 (2006.01); H04J 11/00 (2006.01) | ||
| U.S. Cl. 375—146 [370/210] | 20 Claims |
| 1. A radio communication apparatus for transmitting data to a receiving apparatus, comprising:
a division unit configured to divide the transmit data into a first stream and a second stream;
a serial-to-parallel conversion unit configured to subject the first stream and the second stream to serial-to-parallel conversion
to obtain a plurality of data signals;
a modulation unit configured to modulate the data signals into a plurality of OFDM modulation signals corresponding to the
first stream and the second stream using a plurality of subcarriers;
an acquisition unit configured to acquire a plurality of channel responses between the radio communication apparatus and the
receiving apparatus;
a computation unit configured to compute singular values λ1(k) and λ2(k) of a channel matrix corresponding to a kth (k is a natural number) subcarrier included in the subcarriers, based on the acquired channel responses;
a weight assignment unit configured to assign a plurality of weights corresponding to the singular values λ1(k) and λ2(k) to the first stream and the second stream where a correspondence of each weight to each stream is different by subcarrier;
a multiplication unit configured to multiply, by each of the assigned weights, the OFDM modulation signals corresponding to
each of the first stream and the second stream, and acquire first signals and second signals corresponding to the first stream
and the second stream;
an addition unit configured to add the first signals and the second signals, and acquire added signals;
an inverse Fourier transform unit configured to subject the added signals to inverse Fourier transform; and
a transmission unit configured to transmit, to the receiving apparatus, signals output from the inverse Fourier transform
unit.
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