Distributed Beamformer Construction for Successive Stream Selection on the Interference Channel
Résumé
Interference channel is by definition a configuration
without any centralized entity. Thus information exchange
becomes a bottleneck problem as it is required to construct any
interference minimization solution. In this paper, we propose a
distributed quasi-orthogonal precoder/decoder design solution
on the interference channel. The method reduces the required
exchanges between users as well as the amount of required CSI.
In fact, we consider no apriory knowledge on the interfering
channels. The interference, i.e. forbidden directions, are estimated
in both transmission and reception. This boils down to
the estimation of two simple vectors for each user. Moreover,
the proposed method is a recursive selection procedure thus
with no convergence issues that selects one by one streams
as long as the total sum-rate keeps increasing. We present
here the adopted methodology for stream selection and present
some simulation results showing good performances compared
to centralized algorithms.