The results of a theoretical study of the I−H2O anion and its neutral precursors are presented. The hydrogen-bonded structures were predicted for both the ionic and neutral complexes. The energetically preferred isomer for IH2O however is a species with the direct O–I bond. The relation between the potential energy surfaces for ionic and neutral moieties is evaluated based on their electron affinity properties. Thermodynamic and spectroscopic (IR) properties of complexes are discussed. The interaction energy decomposition is applied to explore the differences between the nature of bonding within the studied complexes.

LoRa (or LoRaWAN) is by far the best known representative of narrowband communication systems designed for the Internet of Things. As a system dedicated specifically for long-range operations, it possesses a considerable processing gain for the energetic link budget improvement and a remarkable immunity to multipath and interference. The paper describes outcomes of measurement campaigns during which the LoRa performance was tested against these two factors, that is, a heavy-multipath propagation and a controlled, variable interference generated, respectively, in a reverberation chamber and an anechoic chamber. Results allow quantitative appraisal of the system behavior under these harsh conditions with respect to LoRa’s three major configurable parameters: the spreading factor, bandwidth, and code rate. They also allow dividing LoRa configurational space into three distinct sensitivity regions: in the white region it is immune to both interference and multipath propagation, in the light-grey region it is only immune to the multipath phenomenon but sensitive to interference, and in the dark grey region LoRa is vulnerable to both phenomena.

Articles you may be interested inComparative density functional theory and post-Hartree-Fock (CCSD, CASSCF) studies on the electronic structure of halogen nitrites ClONO and BrONO using quantum chemical topology