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Hysteresis effects in instantaneous frequency scaling of attenuation on 20 and 30 GHz satellite links

Hysteresis effects in instantaneous frequency scaling of attenuation on 20 and 30 GHz satellite links

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It has been observed with 20/30 GHz satellite beacon measurements that the ratio of 30 GHz to 20 GHz attenuation changes during some fade events. This ratio displays a hysteresis effect. This effect can be explained by a change in the drop size distribution (DSD) during the event. However it appears only above approximately 6–8 dB of attenuation at 20 GHz. Instantaneous frequency scaling of attenuation is being proposed as part of an algorithm for uplink power control (ULPC) and the dynamic range of such an algorithm must be appropriately limited to avoid the hysteresis.

References

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      • : `Attenuation by hydrometeors, in particular precipitation, and other atmospheric particles', 721-3, CCIR Report, 1990, Propagation in Non-Ionized Media, Vol. 5, ITU, Geneva.
    3. 3)
      • Ortgies, G., Rucker, F., Dintelmann, F.: `Some aspects of attenuation frequency scaling', URSI Commission F Symp. on Microwave Propagation, London, Ontario, Canada, p. 450.
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      • R.L. Olsen , D.V. Rodgers , D.B. Hodge . The aRb relation in the calculation of rain attenuation. IEEE Trans. , 2 , 318 - 329
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      • Joss, J., Thams, J.C., Waldvogel, A.: `The variation of raindrop size distributions at Locarno', Proc. Int. Conf. Cloud Physics, 1968, p. 369–373.
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