| 摘要 |
In a transmission apparatus in a MIMO-OFDM communication system employing cyclic diversity, a cyclic delay controller sets plural delay magnitudes, different for respective antennas, in cyclic delayers for each predetermined timing. The cyclic delayers receive symbols subjected to orthogonal frequency division multiplexing, for the respective ones of plural allotted antennas. Additionally, the cyclic delayers bestow cyclic delays on the individual symbols of the respective antennas in accordance with plural set delay magnitudes. The symbols cyclically delayed are outputted from the antennas. As the delay magnitudes, a first delay magnitude at a first transmission timing and a second delay magnitude at a second transmission timing are different for one antenna, and the delay magnitudes differ in the respective antennas for one transmission timing. Thus, in a MIMO-OFDM transmission scheme, frequency diversity and time diversity are enhanced to heighten a retransmission efficiency in a data retransmission mode. |
