Graduate School and Research Center in Digital Sciences

Seminar: Relaying for Interference Management

Aydin Sezgin - Chair of Digital Communications Systems, Department of Electrical Engineering and Information Technology Ruhr-University Bochum

Communication systems

Date: December 17, 2013

Interference is regarded as one of the main limitations of contemporary wireless networks to meet the ever increasing demand for higher rates. Thus, interference management techniques play a central role in the design and daily operation of such networks. The deployment of additional relay nodes within the network is regarded as one of the methods to reduce the impact of interference. However, it is so far not fully understood how to exploit the relay in an optimal way to improve the performance of the network. In this talk, new insights on how to optimally manage interference for an elemental network, which is referred to as the interference relay channel (IRC), are presented. In more details, a high-signal-to-noise ratio (SNR) generalized degrees of freedom (GDoF) characterization of the capacity, which is the maximum rate for reliable communication, of the IRC is obtained. To this end, new upper bounds on the GDoF are derived and the achievability of the bounds is shown by utilizing a scheme referred to as cooperative interference neutralization. Some insights are then presented on the placement of the relay and its impact on the GDoF. For instance, it turns out that the relay increases the GDoF even if the relay-destination link is weak. Moreover, in contrast to the standard interference channel, the GDoF is not a monotonically increasing function of the interference strength in the strong interference regime.

Relaying for Interference Management