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This paper presents a measurement campaign carried out at 3.5 GHz. The objective is to characterize the electromagnetic waves propagation in indoor environment. A double directional channel sounder was used to perform these measurements. The collected data were then processed with a high resolution algorithm to extract the multipath parameters. A comparison between measurement results and a ray tracing...
The objective of this paper is to characterize the electromagnetic waves propagation between adjacent decks on board a ship. First, narrowband measurements were conducted at 2.45 GHz to study the radio coverage. Different configuration scenarios where considered. Then, double directional channel sounding was performed at 3.5 GHz to determine the propagation mechanisms and multipath parameters in this...
Wireless propagation modeling is more and more needed for optimal indoor coverage in complex environment (such as offices, classrooms, etc.). Thus the need to predict electromagnetic propagation efficiently and accurately in the presence of obstacles, allowing engineers to planning efficiently the communicating devices. This paper will present a rigorous electromagnetic indoor propagation modeling...
Wireless Sensor Networks (WSN) have recently gained a great attention in several applications such as environmental monitoring and target tracking. Applying this technology to shipboard monitoring systems may be a cost-effective solution to reduce the cost of wires installation and maintenance. However, wireless communications on board ships may be severely obstructed by the metallic structure of...
Wireless Sensor Networks (WSN) may be a very useful technology for monitoring systems in hostile environments. Few works have treated the use of this technology in the particular metallic shipboard environment. This paper reports on the deployment of a WSN on board a ferry-type boat during realistic conditions. The network was tested during sailings and stopovers for several days. The results of our...
The robustness of the time reversal (TR) scheme in a non stationary channel environment has been previously studied for ultra-wide band (UWB) channels. However, its robustness with different bandwidth specially for bandwidths significantly lower than ultra-wide bandwidths has not been established. In this paper, the performance of a TR communication system has been studied for large number of bandwidths...
Wireless Sensor Networks (WSNs) have been used recently in different applications such as environmental monitoring and target tracking. Few papers have investigated the viability of this technology on board ships. We study in this paper the possibility of replacing the wired shipboard monitoring system by a WSN. This environment has a specific metallic structure which makes the wireless communication...
This paper presents a Doppler radar system used to detect the heartbeat signal from a d√istance of one meter. The proposed system is based on using a vector network analyzer and two antennas. Measurements are performed at 16 GHz for different power levels between 0 and •25 dBm. Both heartbeat rate and heart rate variability are extracted and compared to a simultaneous ECG signal.
Using techniques such as spatial division multiplexing (SDM), transmit beamforming, and space-time block coding (STBC), MIMO systems like IEEE 802.11n are conceived to increase dramatically throughput or to improve the reception range. Nevertheless, MIMO equipment in an indoor environment shows that the power level received in non-noisy conditions is not sufficient to explain the throughput variations...
This paper studies the feasibility of ubiquitous wireless technologies for shipboard monitoring systems. A measurement campaign has been conducted aboard a ferry boat to study the propagation challenges of wireless communication in this harsh environment. Path loss models have been obtained from the measurements results. We have used these results to determine engineering rules concerning the nodes...
This paper presents measured data and empirical models for 2.4 GHz radio propagation path loss aboard ships. The first experiment was conducted aboard a ferry moored to the port, while the second one was carried out aboard another ferry during its cruises between Roscoff (France) and Plymouth (UK). Three different shipboard environments, including engine rooms, parking and passengers' decks, were...
A 60 GHz wireless Gigabit Ethernet (G.E.) communication system capable of near gigabit data rate has been developed at IETR. The realized system covers 2 GHz available bandwidth. This paper describes the design and realization of the overall system including the baseband (BB), intermediate frequency (IF) and radiofrequency (RF) blocks. A differential binary shift keying (DBPSK) modulation and a differential...
This paper presents a deep analysis of an outdoor-to-indoor propagation channel and the related capacities. It is based on a measurement campaign carried out at 3.5 GHz to characterize the outdoor to indoor electromagnetic (EM) wave propagation penetration within buildings. Some relationships between the Weichselberger channel matrix shape and the channel capacity at each measured point are studied...
This paper presents a system for touch-less heartbeat detection and a cardiopulmonary signal modeling approach. Using a vector network analyzer, a microwave system is tested for the detection of the heartbeat signal at a distance of 1 m from a person. The proposed system shows the ability of detecting the heartbeat signals with the possibility of tuning both frequency and power. Measurements are performed...
An experimental validation of high data rate communication for a time reversal (TR) ultra wide-band (UWB) communication system is performed using binary pulse amplitude modulation (BPAM) in two different dense multipath propagation channels for different data rates (15.62 Mbps ?? Rb ?? 1 ?? Gbps). From the measured received signals, signal, interference and noise contributions are separated. At very...
Time reversal (TR) is gaining more and more attention due to its potential to simplify the receiver for an ultra-wideband communication system. The temporal and spatial focusing properties of a TR communication system allow the detection of the received signal with simple receivers. However, the transmitter system becomes complicated as perfect channel estimation is required on regular basis. However,...
This paper presents a contact-less heartbeat detection system and a cardiopulmonary modeling. Using a vector network analyzer, our proposed microwave system shows the ability of detecting the heartbeat signal at different frequencies, as well as at different output power levels. Based on parameters extracted from real measurements, a model representing the heartbeat and the respiration signals is...
This paper presents an architecture of an IR-UWB MB-OOK non-coherent transceiver realized at Mitsubishi Electric. Channel measurements in real indoor environment based on this realized prototype are provided. The different components of this transceiver are described. A comparison between the use of directional and omnidirectional antennas at both emission and reception is presented. Then, a data...
This paper presents the study and the realization of a hybrid 60 GHz wireless communications system. As the 60 GHz radio link operates only in a single-room configuration, an additional Radio over Fibre (RoF) link is used to ensure the communications in all the rooms of a residential environment. A single carrier architecture is adopted. The system uses low complexity baseband processing modules....
In this paper, ultra-wideband (UWB), time reversal (TR) communication is investigated by modifying the transmission prefilter. Mathematical expressions for received signal and the interference in the modified transmission scheme are derived. It is shown that the modified transmission approach reduces multi-user interference which eventually translates into a better bit error rate (BER) performance...
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