Large‐scale site diversity for satellite communication networks

Abstract

SUMMARYThe utilization of high frequencies, such as Ka-band and beyond, necessary to avoid the highly congested lower satellite frequencies and to get larger bandwidth availability is considered for many developing satellite systems.The new satellite low-margin systems in Ka-band will need to be designed using fade countermeasures to counteract rain attenuation. One of these techniques foresees the possibility of switching the communication link among different Earth stations spread on a very large territory to reduce the system outage time to the joint outage time of all the stations.The design of such systems depends on the probability that the Earth stations simultaneously exceed their margins.In this paper, a well-assessed model is utilized for the prediction of joint statistics of rain attenuation in multiple locations, using Monte Carlo simulation. The model is based on a pair of multi-variate normal processes whose parameters are related to those characterizing the single-location statistics and whose covariance matrices are assumed to depend only on the distances between locations.The main results concerning both the probability and margin improvement will be presented and discussed.

Coupling efficiency of laser beam to multimode fiber for free space optical communication

“…In satellite communications, clouds can strongly attenuate the laser signal that would lead to high bit-error rates or temporal unavailability of the link. To overcome the cloud coverage effects, often site diversity technique is implemented [1]. When using multiple ground stations though, simplified optical system is required to allow the usage of more flexible approaches [2].…”

Multidimensional Rain Attenuation Stochastic Dynamic Modeling: Application to Earth–Space Diversity Systems

“…The correlation coefficient may be calculated by the Paraboni-Barbaliscia model [28] for site diversity systems or the modified Lin's model [31] for orbital diversity systems. Analytical expression calculations can be found in [32].…”

“…The correlation coefficient has been calculated using the Paraboni-Barbaliscia model [28] that is also used by ITU in [27] for distances 5 km and 15 km, and it is included in Table I. Dynamic parameter has been chosen to be common for both links, and calculations have been made for the values 10 and 2 10 s [6].…”

Characterization and modelling of time diversity statistics for satellite communications from 12 to 50 GHz

“…To model the time diversity correlation, the proposed function relying on a negative exponential variation with respect to dt, as the proposed in the open literature for site diversity with respect to distance in [12,16]:…”