Abstract
The interference caused by a narrowband system on another system that transmits wideband or spectrally spread signals is, in general, a known problem in wireless communications. However, analyses found in the literature often model the signal of interest as a generic transport channel whose subcarriers convey information of the same kind. This does not reflect the specific structure and application nature of signals conveyed through the different physical channels of the Long Term Evolution (LTE) standard. Having the candidacy of wavelets as adequate means to mitigate narrowband interference (NBI) in both the user and control planes of LTE previously confirmed in Miranda et al. (Narrowband Interference Suppression in Long Term Evolution Systems, pp. 707–711, 2014), in this chapter we extend our analysis to different wavelet types and operation conditions. Biorthogonal, Coiflets, Daubechies, and Haar wavelets are put to the test with respect to their ability to suppress NBI in the LTE downlink. Our simulations suggest that an optimized wavelet-based NBI suppression process calls for different wavelet types, the choice of which being dependent on the LTE physical channel considered. Daubechies are shown to be most convenient for synchronization channels, while Coiflets are found to be the best option when it comes to data shared channels.
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Notes
- 1.
Although such need for coexistence is clear in the context considered here, it may well be justified also in any other bands and/or locations where legacy (non-LTE) systems are in the process of being refarmed.
- 2.
Our field measurements suggest that the impact of NBI is more detrimental in the downlink because of its potential to cause the user terminal to lose connectivity with the base station, as explained later. An uplink analysis along the same lines used here should be straightforward to obtain.
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Acknowledgments
This chapter is based upon work supported by FUNTTEL/FINEP under Grants 01.12.0481.00 and 01.09.0631.00. The authors are also grateful to Dr. L.C. Pereira for fruitful discussions on the suitability of the 802.22 channel model for simulations in the 3GPP Band 31.
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Miranda, J.P., Carrillo, D., Mathilde, F., de Figueiredo, F.A.P., Bazzo, J.J. (2016). Wavelet-Based Narrowband Interference Suppression in Long Term Evolution Physical Channels. In: Paradisi, A., Yacoub, M., Lira Figueiredo, F., Tronco, T. (eds) Long Term Evolution. Telecommunications and Information Technology. Springer, Cham. https://doi.org/10.1007/978-3-319-23823-4_5
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