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Ultra wideband (UWB) signals possess characteristics that may enable high data rate communications with deeply implanted medical sensors and actuators. Nevertheless, this application could be hindered in part by international spectrum regulations, which restrict UWB communications to 3.1–10.6 GHz where propagation conditions through the human body are rather unfavorable. Therefore, for the proper...
Introduction The aim of this study was to demonstrate the safety and the efficacy of the self-gripping Parietex ProGrip™ mesh (Sofradim Production, Trévoux, France) used with the laparoscopic approach for inguinal hernia repair. The incidence of chronic pain, post-operative complications, patient satisfaction and hernia recurrence at follow-up after 12 months was evaluated. Methods Data were collected...
In this paper, a 4 × 4 indoor multiple-input multiple-output ultra-wideband (MIMO-UWB) measurement campaign in the 2-5 GHz bandwidth is presented. The aim of this work is analyze the effect of radio-wave polarization as well as the effect of frequency dependence on MIMO-UWB systems working in laboratories environment. To achieve this, many parameters such as the mean path loss, the RMS delay spread,...
In this paper, a 2×2 time-domain Multiple-Input Multiple-Output (MIMO) channel sounder is presented. The developed system is based on Code Division Multiplexed (CDM) signals. It is formed by a base band pulse generator, a wideband I/Q modulator and a digital store oscilloscope. This system is compared to a frequency domain channel sounder by means of measurements in order to assure the accuracy of...
In this paper the complete state of the art of UWB is presented, ranging from the theory of the wireless channel, measurements, channel modeling the use of UWB in multiple antenna systems. This work presents preliminary results of a measurement campaign accomplished in the Technical University of Cartagena. Measurements were performed from 2 GHz to 5 GHz using a Vector Network Analyzer (VNA), and...
This letter studies the possible application of MIMO polarization diversity in road/railway tunnels. By means of an extensive measurement campaign extending from 2.8 to 5 GHz, different linear array architectures were studied, considering different polarizations within each array. Channel capacity was calculated assuming either a constant signal-to-noise ratio (SNR), whatever the array architecture,...
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