Signal (constellation) shaping can be used to increase the transmission rates of communication system. Signal shaping can be broadly classified into geometric and probabilistic shaping. In geometric shaping, the shape of the constellation is changed (e.g., by choosing constellation points from a nonequally spaced grid). In probabilistic shaping, the probabilities of the constellation points are chosen from a nonuniform distribution.
ICT Lab Projects
In the ICT Lab, the shaping techniques are applied to wireless and optical communications. On wireless communications, we currently focus on enumerative sphere shaping (ESS), which began in 1991 with the project
which came back to life in 2016 with
Enumerative shaping techniques are also being employed by our group in optical communications, with the project
Other probabilistic shaping techniques for optical fibers are also investigated in
Geometric shaping was also investigated for the optical channel in