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In this paper, the feasibility and performance of mm-wave 60 GHz ultra-wide band (UWB) systems for gigabit machine-to-machine (M2M) communications are analyzed. Specifically, based on specifications and experimental channel measurements and models for both LOS and NLOS scenarios, 60 GHz propagation mechanisms are summarized; 60 GHz UWB link budget...
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Context 1
... is proposed for 60 GHz M2M systems. In NLOS cases, diffraction is a significant propagation mechanism, and the signal levels of diffraction and second-order reflection are comparable [5]. This indicates that radio links are relayed by direction and/or second-order reflections in the NLOS propagation scenarios in 60 GHz band. As an example, Fig. 3 shows radiowaves propagate in office room environment for NLOS scenario. In Fig. 3, the diffraction and secondorder reflection rays are denoted by dot and real lines, respectively. It should note that in the NLOS case, signal power loss increases greatly with the increasing of distance between the TX and RX. Thus, propagation range is ...
Context 2
... propagation mechanism, and the signal levels of diffraction and second-order reflection are comparable [5]. This indicates that radio links are relayed by direction and/or second-order reflections in the NLOS propagation scenarios in 60 GHz band. As an example, Fig. 3 shows radiowaves propagate in office room environment for NLOS scenario. In Fig. 3, the diffraction and secondorder reflection rays are denoted by dot and real lines, respectively. It should note that in the NLOS case, signal power loss increases greatly with the increasing of distance between the TX and RX. Thus, propagation range is major concern in NLOS environments in system development. ...
