INTERFERENCE MANAGEMENT IN COGNITIVE NETWORKS

Abstract

Cognitive radios are being studied intensively these days. The major motivation for this is the heavily
underutilized frequency spectrum. Cognitive radio is basically the technique to reuse the unused spectrum to increase the
total system capacity by allowing a group of secondary users to share the radio spectrum originally allocated to the
primary users. This sharing of the spectrum is termed as dynamic spectrum access. In the process of spectrum sharing
cognitive radio locates the idle frequency bands to transmit the data. During the transmission of data cognitive radio
repeatedly checks the reappearance of the primary users and immediately stops the transmission and moves to the other
idle frequency band once the primary user is detected. The collision of cognitive radio’s transmitted data with the
primary user’s data due to some missed detection is termed as the “Interference” and leads to degradation of quality of
service of the primary user as well as cognitive radio user. This paper reviews the enabling technology of cognitive radio
and the techniques employed for the mitigation of the interference.