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High Altitude Platform Networks (HAPNs) comprise an emerging communication solution promising to exploit many of the best aspects of terrestrial and satellite-based systems. Nevertheless, while offering advantageous propagation characteristics, HAP networks are still subject to large fades due to atmospheric precipitation and especially due to rain, for the allocated high frequency bands, necessary though to deliver high data rates. Multi-HAP or orbital HAP diversity is an effective technique to reduce the large fade margins required to assure the specified Quality of Service (QoS).
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