The future generation of High Throughput Satellite (HTS) for broadband distributed user access is strictly connected to the use of Ka-band and beyond frequencies. This is related to the requirement of reaching the so-called "terabit connectivity" to support the increasing bit rate requirements. In order to reach the terabit connectivity target, an important breakthrough is needed in terms of bandwidth availability, hence the use of "beyond Ka-band" frequencies is mandatory to dispose of a larger spectrum. As a matter of fact HTS are bandwidth limited; hence, to reach a very high throughput, bandwidth efficient modulation and coding schemes have to be used. These schemes require satellite resources, as DC power, that are precious and limited. On the other hand, it is well known that the atmospheric propagation impairments at Extremely High Frequency (EHF) bands (30-300 GHz) are severe, in particular when rain events occur; a viable solution is the use of propagation impairments mitigation techniques (PIMTs) which have to be analyzed and properly tuned in order to realize an efficient transmission. This paper is focused on the performance analysis of the smart gateway (SG) PIMT which foresees to redistribute the traffic from the impaired gateway to the other gateways not affected by heavy rain conditions

The Alphasat satellite was launched on 25 July 2013. The Aldo Paraboni technology demonstration payload, funded by ASI under ESA's ARTES Programme, was embarked as an hosted payload on Alphasat. This Technology Demonstration Payload (identified as TDP5 and recently renamed Aldo Paraboni) was implemented under an ESA contract awarded in co-contractorship to Space Engineering and Thales Alenia Space Italia (TAS-I) which conceived the experimental mission and industrialised the subsystems. The Aldo mission is composed of two main elements: a Communication Experiment mission, which aims at assessing the performance of communication links at Q/V Bands; and a Scientific Experiment mission implemented through two beacons at Ka and Q Bands, which aims at characterizing propagation phenomena at these frequencies. During the In Orbit Test campaign of the above two mission components, TDP5 demonstrated compliance to the requirements and the nominal conditions of the Payload. The main topics of this paper are the description of the In Orbit Test requirements and the discussion of tests results. The good health of the Payload is demonstrated by the agreement of the results with the predictions that were calculated on the basis of the results of the on ground test campaign. The Commissioning and IOT campaign of Aldo Paraboni was performed over 3 distinct sessions: • Commissioning: 17-18 September 2013 • IOT Part 1: 10-18 October 2013 • IOT Part 2: 4-8 November 2013 This work is only related to the verification of the performance of the space segment, the Q/V-Band Payload, also referred to as the TDP5. TDP5 stands for Technical Demonstrator Payload #5 and it is formally the 5th experimental (i.e. technological demonstrator) hosted payload of the Alphasat programme

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