| 摘要 |
<p>PROBLEM TO BE SOLVED: To eliminate deterioration in reception quality caused by multi-path fading. SOLUTION: A transmitter side equipment 10 sends s signal subject to spread spectrum by the direct spread modulation system. A receiver side equipment 20 is provided with plural reception antennas 21-23 installed at a prescribed interval and the signal received by the reception antennas 21-23 is given to receiver circuits 24-26 provided corresponding to each other. A reception signal converted into an intermediate frequency signal by the receiver circuits 24, 25, 26 is inputted to a signal strength measurement circuit 27 and sampled by a clock being an integer multiple of a chip frequency outputted from a clock generator 28 and the signal strength is measured. Depending on the result of judgement by the signal strength measurement circuit 27, a selection signal is fed to a path changeover circuit 29 and one of outputs of the plural receiver circuits 24-26 is selected and fed to a direct spread demodulation circuit 26.</p> |
