Abstract
Recent advances in the characterization of fundamental limits on interference management in wireless networks and the discovery of new communication schemes on how to handle interference led to a better understanding towards the capacity of such networks. The benefits in terms of achievable rates of powerful schemes handling interference, such as interference alignment, are substantial. However, the main issue behind most of these results is the assumption of perfect channel state information at the transmitters (CSIT). In the absence of channel knowledge the performance of various interference networks collapses to what is achievable by time division multiple access (TDMA). Robustinterference management techniques are promising solutions to maintain high achievable rates at various levels of CSIT, ranging from delayed to imperfect CSIT. In this survey, we outline and study two main research perspectives of how to robustly handle interference for cases where CSIT is imprecise on examples for non-distributed and distributed networks, namely broadcast and X-channel. To quantify the performance of these schemes, we use the well-known (generalized) degrees of freedom (GDoF) metric as the pre-log factor of achievable rates. These perspectives maintain the capacity benefits at similar levels as for perfect channel knowledge. These two perspectives are: First,scheme-adaptationthat explicitly accounts for the level of channel knowledge and, second,relay-aided infrastructure enlargementto decrease channel knowledge dependency. The relaxation on CSIT requirements through these perspectives will ultimately lead to practical realizations of robust interference management techniques. The survey concludes with a discussion of open problems.
Highlights
There is an ever increasing demand for high data rates as well as reliable and low-delay communication at low cost
Is absent, the degrees of freedom (DoF) performance of various interference networks collapses to what is achievable by time division multiple access (TDMA)
Similar to Section 5.1.3, where we described a robust scheme on the multiple-input single-output (MISO) broadcast channel (BC) under mixed channel state information at the transmitters (CSIT), the scheme on the 3 × 2 X-channel will, in addition to the output feedback provided to Tx-3, exploit mixed CSIT at all transmitters by facilitating partial
Summary
There is an ever increasing demand for high data rates (i.e., high spectral efficiency) as well as reliable and low-delay communication at low cost. In order to meet this demand, service providers have to use the available yet limited resources in the most efficient manner In this context, information theory seeks to characterize the capacity, i.e., the highest possible set of rates for reliable communication, of any wireless network. In addition to efficient resource allocation, infrastructural measures, in particular through means of relay nodes [18], can relax the conditions on the required quality and timeliness of the channel knowledge to achieve a certain DoF [19,20]. We seek to give an overview on promising, state-of-the-art robust interference management techniques in the form of a survey To this end, we use the (G)DoF as a first-order metric for approximating the capacity.
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