Co-channel interference mitigation in the time-scale domain: The CIMTS algorithm

Abstract

In many communication systems, the problem of co-channel interference is encountered when one or more interfering signals are present in a common receiver along with the signal of interest (SOI). Applications may include cellular technology and wireless multi-media. A particular application of interest is the military communication systems operating in an intentionally hostile interference environment. The SOI and the interferences that are correlated possess similar characteristics and power, and they share the same region of support in time and frequency domains. The chapter presents the co-channel interference mitigation in the time-scale domain (CIMTS) algorithm, which estimates the signal of interest (SOI) and the interfering signal from their superposition in the presence of additive noise. This method is inspired by the reconstruction of the interference from the null space of the SOI in the time-scale domain. Once the null space of the SOI is determined, the interfering signal is reconstructed via a set of linear operations. Thus, the SOI is estimated by a simple subtraction of the estimated interference from the observations.