TY - GEN
T1 - Interference alignment via minimizing projector distances of interfering subspaces
AU - Bazzi, Samer
AU - Dietl, Guido
AU - Utschick, Wolfgang
PY - 2012
Y1 - 2012
N2 - A novel interference alignment (IA) algorithm is presented. Interference alignment solutions can be obtained in closed-form for special cases only. In general, iterative algorithms need to be used. Most of these algorithms are based on a joint design of precoders at the transmitter side and receive filters at the receiver side, while the proposed method achieves IA with a precoder design only. We present a new formulation, with more geometrical insights to the IA problem. A design based on precoders simplifies the problem structure and allows receive filters to be designed independently of the IA conditions. We show that optimal precoders lie in complex Grassmannian manifolds. Consequently, the proposed algorithm is an alternating optimization algorithm on the Grassmannian manifold. Simulation results show that a precoder based scheme does not lead to any performance degradation and that the same degrees of freedom as state-of-the-art methods are achieved.
AB - A novel interference alignment (IA) algorithm is presented. Interference alignment solutions can be obtained in closed-form for special cases only. In general, iterative algorithms need to be used. Most of these algorithms are based on a joint design of precoders at the transmitter side and receive filters at the receiver side, while the proposed method achieves IA with a precoder design only. We present a new formulation, with more geometrical insights to the IA problem. A design based on precoders simplifies the problem structure and allows receive filters to be designed independently of the IA conditions. We show that optimal precoders lie in complex Grassmannian manifolds. Consequently, the proposed algorithm is an alternating optimization algorithm on the Grassmannian manifold. Simulation results show that a precoder based scheme does not lead to any performance degradation and that the same degrees of freedom as state-of-the-art methods are achieved.
UR - http://www.scopus.com/inward/record.url?scp=84868022427&partnerID=8YFLogxK
U2 - 10.1109/SPAWC.2012.6292909
DO - 10.1109/SPAWC.2012.6292909
M3 - Conference contribution
AN - SCOPUS:84868022427
SN - 9781467309714
T3 - IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC
SP - 274
EP - 278
BT - 2012 IEEE 13th International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2012
T2 - 2012 IEEE 13th International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2012
Y2 - 17 June 2012 through 20 June 2012
ER -