Jacques Sombrin
Consulting Engineer and Researcher with more than 40 years experience in Microwaves and in Telecommunication Satellites.
Minimizing energy consumption in telecoms
After a career in CNES, the French Space Agency, as a Microwaves Engineer, Head of Microwaves department, Head of Transmission division, Assistant Director and Senior Expert in Radio-Frequency, I work on some of the most interesting and difficult problems that I have encountered, such as: multipactor effect, active and passive nonlinear behavior and measurement, amplifier linearization, and energy optimization in communications.
Energy optimization has always been a main goal in satellite payloads as the available power is strictly limited. It is a big constraint on power amplifiers used in telecommunication satellite payloads. It has also become a big constraint in telephony base stations and mobiles.
The amplifier’s efficiency is higher when driven at high power and even at saturation but the amplifier’s nonlinearity distort the signal and and decrease the link capacity.
The optimization of the input power operating point of the amplifier, or its opposite the input back-off (IBO), and the resulting output power, or its opposite the output back-off (OBO) is one of the principal compromise to be achieved in a payload design and architecture.
I will propose on NOLIPLA website some articles on theses topics.
NOLIPLA 