In mobile communications, simultaneous transmissions of several devices may lead to interference causing some transmissions to fail and sent information to be lost. Due to the ever-increasing density of mobile devices and base stations, managing interference becomes more and more important.<\/p>\n
Some technologies try to avoid interference completely by using reserved channels for each communication. The mature GSM is a typical example for this approach. Today\u2019s WLANs reserve a \u201ctransmission floor\u201d around a communicating pair of devices to avoid interference as far as possible and employ retransmission protocols in case packets are nevertheless lost. In other technologies, interference will basically be allowed but then be mitigated at the receiver with help of modern signal processing techniques and multiple antenna systems.<\/p>\n
The performance of all these techniques is influenced by the dynamic behavior of interference. \u201cImmediate retransmission of unreceived data makes no sense if interference persists over time,\u201d explains Christian Bettstetter, and continues: \u201cA transmission is more likely to succeed under changed interference conditions.\u201d<\/p>\n
The Klagenfurt group made an original contribution to wireless communications that greatly enhances our understanding of interference.<\/p>