Abstract
In overlay systems based on orthogonal frequency-division multiplexing (OFDM) narrow-band interference (NBI) from licensed systems transmitting in the same frequency band degrades system performance significantly. In this paper, the impact of NBI is either reduced by means of an optimized compensation matrix or by simply subtracting an estimated NBI signal from the received signal. The required estimation of the NBI signal is performed by means of a few observation subcarriers. Variations in the center frequency of the interferer are tracked by exploiting information from pilot OFDM symbols for channel estimation. Simulation results show that with both techniques system performance is improved significantly even in presence of strong and dynamically changing NBI.
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Brandes, S., Schnell, M. (2007). Mitigation of Dynamically Changing NBI in OFDM Based Overlay Systems. In: Plass, S., Dammann, A., Kaiser, S., Fazel, K. (eds) Multi-Carrier Spread Spectrum 2007. Lecture Notes Electrical Engineering, vol 1. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-6129-5_12
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DOI: https://doi.org/10.1007/978-1-4020-6129-5_12
Publisher Name: Springer, Dordrecht
Print ISBN: 978-1-4020-6128-8
Online ISBN: 978-1-4020-6129-5
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