A transmitter employing an OFDM system, having a phase rotating portion which gives a same phase rotation amount to each group configured with a plurality of consecutive subcarriers modulated by data or a known signal, a rotation amount determining portion which sets a phase rotation for each antenna set or each transmitter; and, and an allocating portion which allocates a plurality of groups to a receiver.
1. A transmitter in an OFDM system, comprising:
a phase rotating portion which gives a same phase rotation amount to each group configured with a plurality of consecutive subcarriers,
wherein the same phase rotation amount given to a first group configured with a plurality of consecutive subcarriers is a different phase rotation amount than the same phase rotation amount given to a second group configured with a plurality of consecutive subcarriers, and
wherein the phase rotation amount applied to each of the plurality of subcarriers in a group is identical.
2. A transmitting method of a transmitter in an OFDM system, the transmitting method comprising the steps of:
applying a same phase rotation amount to each group configured with a plurality of consecutive subcarriers,
wherein the same phase rotation amount given to a first group configured with a plurality of consecutive subcarriers is a different phase rotation amount than the same phase rotation amount given to a second group configured with a plurality of consecutive subcarriers, and
wherein the phase rotation amount applied to each of the plurality of subcarriers in a group is identical.