[Back]

M. Rezaeekheirabadi, M. Guillaud:
"Interference Channel Sum Rate Optimization on the Grassmann Manifold";
Talk: International Symposium on Wireless Communication Systems, Paris, Frankreich; 08-28-2012 - 08-31-2012; in: "Proc. International Symposium on Wireless Communication Systems", (2012), 1 - 5.

The problem of truncated unitary precoder design
for the Multiple-Input Multiple-Output Interference Channel
(MIMO-IC) is investigated. A simple gradient ascent method is
utilized over the Grassmann manifold to maximize the sum rate
achieved over the MIMO-IC. Since such optimization methods
are not guaranteed to converge to the global solution, we also
introduce an implementation of simulated annealing for the
problem at hand and compare the performance of the two
methods. The results show that the gradient on the Grassmann
manifold provides gains over existing methods such as max-
SINR, in particular when asymmetric channels are considered
and the achieved performance is comparable to that achieved
by more complex methods not restricted to unitary constraints.
Furthermore it performs close to the simulated annealing method
at low SNR regime.

interference alignment, Grassmann manifold, gradient

http://publik.tuwien.ac.at/files/PubDat_211808.pdf