| 摘要 |
PROBLEM TO BE SOLVED: To stably receive a signal, to which orthogonal frequency-division multiplexing is applied, in simple configuration. SOLUTION: Delay circuits 9-11 add time delay to a received signal so that a delay time difference between received signals simultaneously received by plural antennas 1-4 can become >= the inverse of band width assigned to one subcarrier in an orthogonal frequency-division multiplexing system. Thus, a signal after synthesizing by a mixer 12 can be regarded practically equal with a received radio wave in a multipath environment. Besides, by shortening the delay time difference between the received signals simultaneously received by the plural antennas 1-4 sufficiently rather than the length of a guard interval block, a margin for the arrival of waves delayed by a multipath can be actually sufficiently secured as well.
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