Reliable prediction methods to predict the multipath fading activity of the microwave link are required for economical system design. However, there is insufficient data and uncertainty about the existing multipath fading models for tropical regions. An extensive experimental program has been undertaken on an over-water line-of-sight radio relay link in Singapore. Measurement results showed that the multipath fading activity of the microwave link has distinct seasonal and diurnal patterns. Most multipath fading occurs at night during the inter-monsoon seasons. Typically multipath fading occurs when there is low wind activity and high humidity.
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