The Teager-Kaiser Energy Operator in Presence of Multiple Narrowband Interference

As the analog front-end of an energy detector is highly susceptible to narrowband interference a modified energy detection scheme based on the Teager-Kaiser operator and high-pass filtering is considered. This letter analyzes the Teager-Kaiser operator output for an arbitrary number of narrowband band-pass signals having different amplitudes, center frequencies and bandwidths. The analysis reveals that additional cross components occur at the operator's output in case of multiple narrowband interference. Hence, a simple narrowband interference suppression with Teager-Kaiser operator and high-pass filtering can be insufficient.