| 摘要 |
A technique for stably receiving an orthogonal frequency division multiplexed signal by means of a simple structure. Delay circuits 9-11 add delay times to the signals simultaneously received by antennas 1-4 in such a way that the delay time difference between any two signals is the reciprocal or more of the bandwidth allocated to one subcarrier of orthogonal frequency division multiplex. Thus, the signal synthesized by a mixer 12 can be assumed to be substantially equivalent to the received signal in a multipath environment. Since the delay time differences among the signals simultaneously received by the antennas 1-4 are sufficiently shorter than the length of the guard interval section, the margin prepared for actual arrival of a delay wave because of multipath is sufficiently ensured.
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