Joint Narrowband Interference Detection and Channel Estimation for Wideband OFDM

Narrowband interference reduces performance of present transmission systems, and will do so in the future to an even higher extent. The interference mainly hinders a correct data signal detection. But it may already have distorted the channel estimation, even for more carriers than the one, actually containing the carrier of the narrowband interferer. Therefore it is substantial to correctly detect the interferer power and its position in the frequency grid. This paper discusses an interference detection scheme in interaction with a preamble based channel estimation for the MB-OFDM standard. It covers the fact that due to large subcarrier channel power fluctuations, either detection probability is poor because of high thresholds, or reduced thresholds make rise to the false alarm probability.