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In this paper, a prototype of a dual-polarized array antenna is presented. This array was designed in the framework of a collaborative project on spatial modulation schemes. It will be used for the project testbed and for space-time channel measurements. This array features several novelties, including a slant uniform planar structure, a scalable design with integrated switching circuitry, a reference...
In this paper, off-body channel measurements are proposed using miniaturized chip antennas (dimension: 7 × 2 × 1.20 mm3) under pattern diversity configuration at 2.2–2.3 GHz. The measurements were carried out in a multipath indoor laboratory environment using two sensors as transmitter and receiver deployed on-body and free-space, respectively where each sensor comprises two miniature chip antennas...
In ultra-wide band (UWB) propagation channel modelling, antenna effects ?? namely frequency and polarisation aspects ?? must be considered to provide realistic waveform characteristics and realistic signal received power. The authors propose an efficient method which enables ultra-compact parametric modelling of fully three-dimensional antenna radiation behaviour for UWB ray tracing channel simulation...
This paper presents a 3D-RT simulator which allows indoor radio wave propagation modeling for multi-standard systems, including UWB. It focuses on the issue of simulation of deterministic radio channel with realistic antenna behavior. Vector Spherical Harmonics (VSH) expansion of antenna radiation vector function is used to have efficient data access, good compression factor, and fast waveform reconstruction.
RT (ray tracing) tools are commonly used to simulate UWB-IR (ultra wideband-impulse radio) propagation channel for different applications like network optimization, interference monitoring, or localization based applications. In this paper, different methods of reconstructing received signal in RT tools are presented, concluding that they are not all equivalent from digital implementation point of...
In order to consider the effects of antennas in UWB (ultra wideband) channel simulation, it is necessary to describe the antenna radiation pattern over 4pi-steradians, within the entire frequency band. This leads to a very large amount of data and hugely increases computation time, especially when working with a RT (ray tracing) based propagation simulator that only needs antenna data for a finite...
This paper deals with a new modulation technique based on symmetric chaos shift keying (SCSK) and its receiver structure is described for optimal synchronization. The masked symmetric chaos shift keying (MSCSK) improves both security of information signal compared to SCSK and demodulation procedure. Optimal synchronization of two identical chaotic systems is performed in the paper. By using dissipativity...
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