| 摘要 |
A channel capacity is increased by using MIMO (multiple input multiple output) radio relaying system. A transmission is made from a transmitter 10 using a first antenna 11 1 and a second antenna 11 2 having polarization characteristics which are orthogonalized to each other. A reception is made in a repeater 20 1 using reception antennas 21 1 and 21 2 each having the same polarization characteristic as the first and the second antenna 11 1 and 11 2 , respectively. Each signal received by the first and the second reception antenna 21 1 and 21 2 , respectively, is passed through loop interference suppressors 27 1 and 27 2 , respectively, and through amplifiers 24 1 and 24 2 , respectively, to be transmitted from the first and the second transmission antenna 21 1 and 21 2 having the same polarization characteristics as the second and the first antenna 11 2 and 11 1 , respectively. A reception is made in a receiver 30 by antennas 31 2 and 31 4 having the same polarization characteristic as the first antenna 11 1 , and the reception is also made by antennas 31 1 and 31 3 having the same polarization characteristic as the second antenna 11 2 . These received signals are subject to a signal separation processing in MIMO equalizer 32.
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