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This paper proposes a three-dimensional (3-D) scattering model for multiple-input multiple-output (MIMO) land mobile stratospheric multipath-fading channels. Analytical and closed-form expressions for the spatial and temporal correlation functions between two arbitrary sub-channels are derived, assuming non-isotropic or isotropic scattering environments. This model can be used to estimate the required...
High reliability and low latency are crucial requirements for vehicular safety applications. We have previously proposed a media access control (MAC) protocol for a roadside-to-vehicle communication (RVC) system using narrow antenna beam switching with multiple antenna beams to increase reliability even in a shadowing region. In this paper, we describe transmission performance evaluation of an RVC...
This paper deals with fixed-beam planar microstrip antenna arrays that are envisaged for modern communication systems, e.g. as antenna on air-platform of HAP system. In the contribution the general description of analysis and synthesis (Taylor approach) procedures for planar arrays and passive beam forming networks are described. The array concept is based on (2 times 2) and (2 times 4) module sub-arrays...
A mechanically steered hemispherical lens antenna was investigated using the commercially available MOM software FEKOTM to meet a requirement for a low weight and low cost mm-wave transmit antenna for installation onboard a large passenger aircraft. Hemispherical homogeneous lenses of relative permittivity 2.5 and 4 wavelength radius were found to meet the 26.5 dBic gain specification across 75deg...
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