Description of the deliverable content and purpose
This report summarises the effort put forward in WP6 to address the electromagnetic coexistence of e-SENSE proposed short-range radio system, in the crowded electromagnetic environment of the foreseen scenarios developed in WP1.
The statements set in this document are founded on computer results (also exposed in the document) obtained with the developed simulation tool, WACAT, and on the coexistence scenarios described in D6.2.1, which in turn are founded on the scenarios provided by WP1.
Wireless Access Coexistence Analysis Tool (WACAT) is based on full Power Spectral Density (PSD) analysis of each device, allowing obtaining Signal-to-Interference and Noise Ratio, as a representation of coexistence level in a radio link between two devices. WACAT is developed in Matlab, considered a powerful environment to support process that requires complex mathematic structure.
Section 2 - presents an overview of WACAT, including a short description of each scenario (accordingly with already published D6.2.1), parameters that set the simulation up and general information describing all nodes used in a single test.
Section 3 - displays results obtained using WACAT. The simulation tool produces a large amount of information. In order to present these results in a more understandable way, some graphics have been composed with several simulations’ outputs. The main objective is to determine statistically, the number of successful intended links between nodes in the different environments. Nevertheless it is also interesting to observe the relation between devices from different technologies, analysing the spectral signal received.
WACAT can includes and mixes devices from heterogeneous technologies (cellular, Wi-Fi, WSN, etc), any of which is a single node, with its own specifications provided by standardisation bodies. In this simulation environment the word “node” could in fact be used for transceivers with any radio technology. It is advisable as well, to remind that standards specifications related with out of band emissions need to be compared with real emission masks in order to obtain reliable results. Following just standardisation bodies’ specifications will produce a worst-case simulation result.
The following, Section 4 - , describes plans for coexistence improvements in the ISM bands, which is a natural choice for emerging technologies as proposed in e-SENSE. An unlicensed band, like the Industrial, Scientific and Medical (ISM), is very attractive for innovative companies, since there is an open opportunity for solutions with very short time to market. This approach of band “liberalisation” has fostered the proliferation of new radio technologies using these ISM bands: Bluetooth, Wi-Fi, ZigBee, Z-Wave, Analog audio links, Analog video links, etc. This proliferation of different technologies, not all with the same coexistence vision, increases the possibility of collision and mutual interference as some of the studied scenarios reflect in this document. WACAT establishes the coexistence level of all involved nodes, comparing the desired signal PSD and immunity levels with the noise PSD generated by all other nodes present in the scenario.
Section 5 - presents the conclusions drawn from the electromagnetic compatibility study carried out in this document.
As previously stated, nodes are characterized following the standardisation bodies’ emission and immunity masks. However it is convenient to compare emission masks and real world emissions, in order to provide more realistic conclusions. Some information, and field measurements, of real emission levels are provided in Annex A (Section 7)
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