Narrowband Interference Suppression for OFDM Systems with Guard Band

Abstract

Narrowband interference (NBI) affects performance of orthogonal frequency division multiplexing (OFDM) system to a great extent. Although NBI can be suppressed by employing time-domain prediction error filter (PEF), its effectiveness is reduced due to the usage of guard band which interrupts the spectrum. This paper discusses this problem and proposes two methods to improve the efficiency of PEF in the presence of guard band. Simulations show that proposed methods outperform conventional PEF in the signal to interference plus noise ratio (SINR). Moreover, channel effect caused by PEF must be compensated before demodulation in OFDM system, which is also discussed in this paper.