Normalized Matched Filter for Blind Interference Suppression

This paper proposes and analyzes a modification to the standard matched filtering operation utilized in filter-bank multicarrier spread spectrum (FB-MC-SS) communications. This modification minimizes the impact of interferers occupying any of the subcarrier bands without a priori knowledge of the interferers' location or power characteristics. A full analysis of its performance is presented which indicates its usefulness in environments where interference is likely to be experienced, such as when secondary users (SUs) underlay licensed users' bands. Whereas the standard matched filter proved to be ineffective for packet detection and timing acquisition in these harsh environments, making it the limiting factor in performance, the modified matched filter effectively removes the harmful effects of interferers.