Superposition Coding Strategies: Design and Experimental
Evaluation Source: University of Notre Dame The authors design
and implement a software-radio system for Superposition Coding
(SC), a multiuser transmission scheme that deliberately
introduces interference among user signals at the transmitter,
using a library of off-the-shelf point-to-point channel codes.
They experimentally determine the set of rate-pairs achieved by
this transmission scheme under a packet-error constraint. Their
results suggest that SC can provide substantial gains in
spectral efficiencies over those achieved by orthogonal schemes
such as Time Division Multiplexing. Their findings also question
the practical utility of the Gaussian approximation for the
inter-user interference in Superposition-Coded systems.