Open AccessProbability bounds of cross‐layer interference in femtocell‐underlay cellular networks employing interference alignment
Author(s) -
Ghiamatyoun Alireza,
Olfat Ali
Publication year - 2019
Publication title -
iet communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.355
H-Index - 62
eISSN - 1751-8636
pISSN - 1751-8628
DOI - 10.1049/iet-com.2019.0196
Subject(s) - underlay , interference (communication) , telecommunications link , computer science , channel (broadcasting) , femtocell , interference alignment , cellular network , topology (electrical circuits) , co channel interference , zero forcing precoding , upper and lower bounds , computer network , mathematics , telecommunications , signal to noise ratio (imaging) , precoding , combinatorics , mimo , base station , mathematical analysis
In a conventional cellular network underlaid with femtocells, the authors employ interference alignment (IA) to restrict cross‐layer co‐channel interference (X‐interference). In their scenario, locally obtained channel state information is allowed to be conveyed between heterogeneous nodes to construct a decentralised IA‐based scheme. Furthermore, they provide closed‐form formulas for the upper bounds of X‐interference in both uplink and downlink directions and characterise how they asymptotically approach zero for big enough channel dimensions used by individual nodes. Simulation results demonstrate that X‐interference is always bounded by the above‐mentioned limits and prove accuracy of their analytical formulas.