Abstract

Frequency diversity usually is employed in microwave radio systems, where protection channels with different frequencies are prepared and the transmitting data signal is switched to the protection channel to secure the channel reliability when the channel quality is deteriorated by the fading. In multicarrier radio systems, there can be various channel switching configurations, since the protection channel is composed of more than one primary carriers. This paper discusses the effects of the frequency diversity in various switching schemes in the multicarrier radio system. As the model for the theoretical analysis for the microwave fading, the three-ray multipath fading model is assumed which is close to the actual transmission path. The frequency correlation coefficient and the joint probability for the received power distribution in different radio channels also are derived by a simulation calculation. The effects of the frequency diversity of various switching schemes in the multicarrier system are evaluated. The validity of the presented result is verified by the simultaneous measurement of more than one channel with different frequencies in the actual over-water transmission path by the measurements of the frequency correlation coefficient and the joint probability distribution for the received power.

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