Xavier Raimundo

Xavier Raimundo
Durham University | DU · School of Engineering and Computing Sciences

About

23
Publications
2,943
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257
Citations
Citations since 2017
11 Research Items
226 Citations
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20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060

Publications

Publications (23)
Article
Full-text available
The International Telecommunications Union Radiocommunication Sector (ITU‐R) Study Group 3 identified the need for a number of radio channel models in anticipation of the World Radiocommunications Conference in 2019 when the frequency allocation for 5G will be discussed. In response to the call for propagation path loss models, members of the study...
Article
Full-text available
Millimeter wave (mmWave) communication is a key technology for fifth generation (5G) and beyond communication networks. However, the communication quality of the radio link can be largely affected by rain attenuation, which should be carefully taken into consideration when calculating the link budget. In this paper, we present results of weather da...
Conference Paper
THz frequencies offer the potential for high data rate, short-range communication. In this paper, a THz Vector Network Analyser operating in the 0.75 to 1.1 THz region is used to characterise short (sub 30 cm) channel lengths. Path loss and diffraction losses are reported.
Article
In this paper, we present simulation results of monostatic configuration for microwave imaging system by using confocal algorithm to detect and localize metallic bars inserted in a concrete pillar. An ultra-wideband antenna has been used. The dielectric property values of the model were chosen near those of the realities. However, we have changed t...
Article
In this study, results of wideband dual polarised measurements conducted in indoor environments including office, factory, corridor and computer foyer, using state-of-the-art 2×2 multiple-input-multiple-output frequency modulated continuous wave-based channel sounder, are presented. The measurements were performed in two frequency bands with 6 GHz...
Conference Paper
In this paper, results of wideband outdoor measurements conducted on the science site campus of Durham University are presented. The measurements were made simultaneously in the frequency band of 25.5 – 28.5 GHz (K-band) and 51 – 57 GHz (V-band) using the custom designed two transmit single receive (Multiple Input Single Output) multiband chirp bas...
Article
Microwave breast imaging uses backscattered radar signals to identify cancerous tissue within the breast. It is a non-invasive technique and uses non-ionizing radiation; it is currently a potential alternative for classical techniques. This article presents an efficient image reconstruction method for breast cancer detection using an ultra-wideband...
Article
This paper presents simulation results of an ultra wideband microwave imaging radar system, using confocal imaging reconstruction algorithm for detection of metallic bar embedded in concrete pillar. The dielectric properties of the material (concrete and metallic bar) were chosen to mimic those of the real world. Successful detection and localizati...
Article
Full-text available
This paper presents the design and optimization of patch-like antennas for Through-The-Wall Imaging (TTWI) radar applications in the frequency range 0.5-2 GHz. A basic antenna configuration is analyzed and modified through an optimization aiming at reducing the size of the antenna and at focusing the radiated power in a single lobe to be directed t...
Article
Applications of the unlicensed 60 GHz band include indoor wireless local area networks, outdoor short range communications and on body networks. To characterize the radio channel for such applications, a novel digital chirp sounder with programmable bandwidths up to 6 GHz with switched two transmit channels and two parallel receive channels for mul...
Article
In this paper, we propose a new ultra wide band (UWB) antenna configuration which has a fork shape, designed for microwave imaging. A superstrate layer is added in the environment of the antenna to increase the performance in terms of gain, and directivity. The proposed antenna is arranged on dielectric substrate (dielectric permittivity εr = 3.34,...
Article
There are various types of methods and techniques that have been utilized for the detection and reconstruction of embedded objects. Here, we present a new imaging method to detect metal bars into a concrete pillar through the application of microwave imaging UWB radar, using delay and sum integration algorithm. Successful detection and localization...
Article
A newly developed multi-band FMCW channel sounder at Durham University was used to perform measurements in the ISM bands in three test beds and on-body measurements in the 60 GHz band. The sounder uses an agile frequency synthesiser to sweep across its bandwidth which enables real time measurements in comparison to the Vector Network Analyser. In t...
Article
Full-text available
Undesired wall reflections in through-the-wall imaging can mask the return from actual targets and saturate and block the receiver. We propose frequency-modulated interrupted continuous wave (FMICW) signals as a novel wall removal technique and validate its effectiveness through numerical simulations and experiments performed using a radar system b...
Conference Paper
Undesired reflections at the interface between air and other materials can compromise the detection of targets and saturate and block the receiver in a variety of radar systems for applications such as through-wall imaging, ground penetration radar, and medical imaging. In this paper we propose a technique based on frequency modulated interrupted c...
Conference Paper
In this paper bit error rate (BER) performances of the built-in MATLAB multipath fading simulator, which recreates a theoretical channel based on user's specified parameters, have been compared to that of a 'playback' based channel simulator. The MATLAB fading simulator has been configured with parameters estimated from the same radio channel measu...
Conference Paper
This paper presents reference measurements of 2 × 2 UWB antenna arrays consisting of discone antennas with a frequency range from 2 - 6 GHz performed in a reverberation chamber. The measurements are used to evaluate the diversity gain of arrays with different topologies as well as MIMO capacity. Results of comparing the diversity gain results with...

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