Abstract
The main challenges for current industrial wireless solutions are the stringent real-time requirements of industrial automation applications and the harsh propagation channel conditions in this kind of scenarios. Most of the current industrial wireless communications are based on existing standards like IEEE 802.11, IEEE 802.15.1 or IEEE 802.15.4 and additionally proprietary protocol extensions are applied over them. These communication systems cover a wide range of industrial applications but they lack robustness when it comes to tight real-time requirements for factory automation. Hence, new schemes for the physical layer, along with new media access techniques, for industrial wireless communications must be proposed. Among the upcoming technologies, modulation candidates for 5G and cognitive radio might be promising solutions. In this article we analyse FBMC-OQAM, GFDM-OQAM and WCP-COQAM modulation candidates for 5G in terms of bit error rate, power spectral density and spectral efficiency over highly dispersive channels. From this analysis, on the one hand, we assess the suitability of these modulation systems for industrial wireless communications based on cognitive radio. On the other hand, we provide additional details about how windowing affects the protection against highly dispersive multipath channels and the spectral efficiency in WCP-COQAM.
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