On the Spatial Degrees of Freedom Benefits of Reverse TDD in Multicell MIMO Networks

TitleOn the Spatial Degrees of Freedom Benefits of Reverse TDD in Multicell MIMO Networks
Publication TypeConference Paper
Year of Publication2016
AuthorsJ. Fanjul, and I. Santamaría
Conference Name24th European Signal Processing Conference (EUSIPCO 2016)
Pagination1363-1367
Month PublishedSeptember
Conference LocationBudapest, Hungary
AbstractIn this paper we study the degrees of freedom (DoF) achieved by interference alignment (IA) for cellular networks in reverse time division duplex (R-TDD) mode, a new configuration associated to heterogeneous networks. We derive a necessary feasibility condition for interference alignment in the multi-cell R-TDD scenario, which is then specialized to the particular case of symmetric demands and antenna distribution. We show that, for those symmetric networks for which the properness condition holds with equality, R-TDD does not improve the DoF performance of conventional synchronous TDD systems. Nevertheless, our simulation results indicate that, in more asymmetric scenarios, significant DoF benefits can be achieved by applying the R-TDD approach
PDF version: