A receiver employing an OFDM system which uses a frequency band that is constituted by a plurality of subchannels, and receiving a signal added a phase rotation which is made to respectively differ for each transmission antennas of transmitter and transmitted from the transmission antennas, having a virtual subchannel quality estimating portion which estimates the quality of a propagation path in the case of same phase rotation is added to signal transmitted from transmitter, each group configured with a plurality of consecutive subcarriers.
1. A receiver in an OFDM system which uses a frequency band that is constituted by a plurality of subchannels, the receiver comprising:
a receiving portion for receiving subcarriers for propagation path estimation in which rotation was not added at a transmitter side;
a propagation path estimating portion for estimating propagation path information from said received subcarriers for propagation path estimation in which rotation was not added at the transmitter side;
a virtual subchannel quality estimating portion for providing a rotation to a selection of one of said propagation path information in which rotation was not added at the transmitter side and the virtual subchannel quality estimating portion estimates the quality of the plurality of subchannels when said rotation is provided to said selection of propagation path information in which rotation was not added at the transmitter side.
2. A receiving method wherein a receiver uses a frequency band that is constituted by a plurality of subchannels, the receiving method comprising:
receiving subcarriers for propagation path estimation in which rotation was not added at a transmitter side;
estimating propagation path information from said received subcarriers for propagation path estimation in which rotation was not added at the transmitter side;
providing a rotation to a selection of one of said propagation path information in which rotation was not added at the transmitter side; and
estimating the quality of the plurality of subchannels when said rotation is provided to said selection of propagation information which rotation was not added at the transmitter side.