Abstract: The present disclosure relates to a switching apparatus comprising one or more electrical poles, wherein for each electric pole, the switching apparatus comprises a first fixed contact electrically connected to a first pole terminal, a second fixed contact electrically connected to a second pole terminal and a third fixed contact electrically connected to a ground terminal. The switching apparatus further comprises a movable contact, which is reversibly movable about a corresponding rotation axis so that said movable contact can be coupled to or uncoupled from one or more of the above-mentioned fixed contacts, and a vacuum interrupter. An auxiliary contact is electrically connected to said fixed arc contact and a contact lever is electrically connected to said auxiliary contact and reversibly movable about a corresponding second rotation axis. The contact lever is couplable to said movable contact to electrically connect said movable contact to said auxiliary contact.

Abstract: A method, carried out by a gateway transmitter (400), aims at compensating the nonlinearities of a communication channel (500) comprising a repeater (510). A plurality of digital signals is modulated (s10) on a plurality of carriers, wherein symbols of the constellation diagram used for modulation of each carrier are distorted in accordance with a pre-distortion function. The modulated signals are then frequency division multiplexed (s20), and sent (s30) for transmission, through the communication channel (500), to at least one receiver (600). The pre-distortion function involves a plurality of polynomial functions, each of which taking as input the symbols from all the carriers. The polynomial functions' coefficients, called “pre-distortion coefficients”, are computed according to a direct learning approach, performed jointly for the plurality of carriers. The pre-distortion coefficients are iteratively updated based on received signals being fed back from a receiver (600).

Abstract: A method, carried out by a gateway transmitter (400), aims at compensating the nonlinearities of a communication channel (500) comprising a repeater (510). A plurality of digital signals is modulated (s10) on a plurality of carriers, wherein symbols of the constellation diagram used for modulation of each carrier are distorted in accordance with a pre-distortion function. The modulated signals are then frequency division multiplexed (s20), and sent (s30) for transmission, through the communication channel (500), to at least one receiver (600). The pre-distortion function involves a plurality of polynomial functions, each of which taking as input the symbols from all the carriers. The polynomial functions' coefficients, called “pre-distortion coefficients”, are computed according to a direct learning approach, performed jointly for the plurality of carriers. The pre-distortion coefficients are iteratively updated based on received signals being fed back from a receiver (600).