Analysis of the Impact of WiMAX-OFDM Interference on Multiband OFDM

TitleAnalysis of the Impact of WiMAX-OFDM Interference on Multiband OFDM
Publication TypeConference Paper
Year of Publication2007
AuthorsSnow, C., L. Lampe, and R. Schober
Conference NameUltra-Wideband, 2007. ICUWB 2007. IEEE International Conference on
Pagination761 -766
Date Publishedsep.
KeywordsGaussian approximations, interference, mitigation techniques, multiband OFDM, OFDM modulation, ultra wideband communication, WiMAX-OFDM

This paper presents an analysis of the performance of the multiband orthogonal frequency division multiplexing (MB-OFDM) system for ultra wideband (UWB) communication in the presence of interference from an IEEE 802.16 WiMAX-OFDM system operating in the 3.5 GHz band. Recent work (Hu amp; Beaulieu, IEEE Trans. Commun., Oct. 2006) has demonstrated accurate Gaussian approximations for narrowband OFDM interference to time-hopping and direct-sequence UWB victim receivers, but little analysis has been done for MB-OFDM. Because of the significant differences in signal model and receiver design, it is also not clear that such Gaussian approximations hold for MB-OFDM victim receivers. Motivated by this question, we present an exact analysis of the uncoded bit error rate (BER) of the MB-OFDM system, based on Laplace transform techniques. We also present a simple but accurate Gaussian approximation for the WiMAX-OFDM interference, and confirm both the exact and approximate analysis via simulations. We find that, depending on the signal-to-interference ratio, interference from WiMAX-OFDM systems may have a substantial impact on the performance of MB-OFDM. However, the approximately Gaussian nature of the interference signal gives hope for the development of simple interference detection and mitigation techniques.


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