On UWB Impulse Radio Receivers Derived by Modeling MAI as a Gaussian Mixture Process

One of the main problems in ultra wide band (UWB) impulse radio (IR) systems is the need to cope efficiently with multiple access interference (MAI). As outlined recently in the literature, this can be achieved by modeling MAI as a Gaussian mixture (GM) random process and deriving the receiver in accordance with a maximum likelihood paradigm. Depending on the chosen context, both rake and chip-matched solutions can be identified. In this paper we compare different solutions, generalize them to a QAM context, and investigate their implementation complexity and robustness to impulsive interference. We also investigate efficient methods to lower the computational demand.