S. M. Feeney
Durham University
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Publication
Featured researches published by S. M. Feeney.
IEEE Transactions on Wireless Communications | 2016
Sana Salous; S. M. Feeney; Xavier Raimundo; Adnan Korhan Cheema
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 multiple-input multiple-output (MIMO) measurements was realized. For waveform durations of 819.2 μs, Doppler measurements can be performed up to 610 Hz for the single transmit and two receive configuration or 305 Hz for MIMO measurements. In this paper, we present the architecture of the sounder and demonstrate its performance from back to back tests and from measurements of rms delay spread, path loss and MIMO capacity in an indoor and an outdoor environment. For 20 dB threshold, the rms delay spread for 90% of the measured locations is estimated at 1.4 ns and 1 ns for the indoor and outdoor environments, respectively. MIMO capacity close to the iid channel capacity for 2 by 2 configuration is achieved in both environments.
Iet Communications | 2008
Sana Salous; S. M. Feeney; Khawar Khokhar; R. Lewenz
Simultaneous measurements with 10 MHz bandwidth at 2.5, 3.5 and 5.8 GHz were performed in a rural/semi-rural environment in the UK. The measurements were processed to generate power delay profiles to estimate the root mean square delay spread of the channel. The frequency range of the orthogonal frequency division multiplexing (OFDM) symbol bandwidth that has dropped below a predefined level, termed herein as average fade bandwidth, and the corresponding level crossing are employed to quantify the severity of frequency selectivity. The channel data were used to estimate the bit error rate, for the 256 carrier-OFDM IEEE802.16 standard using a frequency domain channel simulator especially designed for the study. It was found that the performance of quasi-stationary wireless broadband systems depends mainly upon the frequency selectivity and the channel coding rate with 1/2 rate coding giving a superior performance to 3/4 rate coding. Puncturing was found to weaken the capability of forward error correction coding in the presence of series of deep fades in the channel transfer function.
loughborough antennas and propagation conference | 2008
S. D. Gunashekar; E. M. Warrington; Sana Salous; S. M. Feeney; H. Zhang; N. M. Abbasi; L. Bertel; Dominique Lemur; Martial Oger
Over the last few years, the concept of multiple input multiple output (MIMO) has become a popular area of research in the field of wireless communications with the aim of delivering increased data rates. However, to date, MIMO research has focussed primarily on communications within the VHF, UHF and SHF bands (and above). Very little experimental or modelling research has been conducted in the area of exploiting MIMO techniques within the HF radio band. This paper describes some of the preliminary experimental work that has been carried out in order to investigate the feasibility of implementing MIMO techniques within the HF band.
ursi general assembly and scientific symposium | 2011
S. M. Feeney; Sana Salous; E. M. Warrington; S. D. Gunashekar
This paper describes compact antenna arrays for multiple input multiple output MIMO capacity studies in the HF band. These include a three-element receiver array with active electronics to provide broadband non-tuned operation across the entire HF band and a two-channel resonant magnetic loop array for transmitter applications capable of rapid tuning across greater than two octaves. MIMO measurements over a 255 km sky-wave link in the UK using these compact arrays and spatial arrays were performed to estimate the correlation coefficients between the different elements and the resulting MIMO capacity.
international conference on telecommunications | 2012
S. M. Feeney; Sana Salous
The architecture of an UWB multi-band channel sounder is presented. The sounder architecture provides an FMCW source to enable measurements in the frequency range up to 1 GHz (which covers the TV white space / digital dividend), the 2.2 – 2.9 GHz band (ISM and LTE) and the 4.4 – 5.9 GHz band (ISM / WiLAN). Additional frequency converters support operation in the 16 GHz and 60 GHz bands. Here we have configured a 2 by 2 MIMO system in the 60 GHz band specifically targeting channel measurements to support the development of on-body networks and short range backhaul communication networks. Performance results in the 2.4 GHz ISM band demonstrate the resolution of the sounder.
loughborough antennas and propagation conference | 2011
N. M. Abbasi; E. M. Warrington; S. D. Gunashekar; Sana Salous; S. M. Feeney
The feasibility of compact collocated antennas in HF-MIMO systems has been investigated and the results compared with large collocated arrays. The impact of ionospheric conditions on the envelope correlation and MIMO capacity were also analysed. The antenna decorrelation between the receive elements and the corresponding capacity of the system are a function of the type of antenna array used and the prevailing propagation conditions in the ionosphere. The role of antenna phase patterns in contributing to the resultant decorrelation is also studied using the NEC antenna modelling software.
(2009). 11th International Conference on Ionospheric Radio Systems and Techniques, IRST 2009, 28-30 April 2009, Edinburgh, Scotland ; proceedings. Herts, UK: IET | 2009
N. M. Abbasi; S. D. Gunashekar; E. M. Warrington; Sana Salous; S. M. Feeney; L. Bertel; Dominique Lemur; Martial Oger
Radio Science | 2009
S. D. Gunashekar; E. M. Warrington; Sana Salous; S. M. Feeney; N. M. Abbasi; L. Bertel; Dominique Lemur; Martial Oger
Radio Science | 2010
S. D. Gunashekar; E. M. Warrington; S. M. Feeney; Sana Salous; N. M. Abbasi
Annals of Geophysics | 2009
Salil D. Gunashekar; E. Michael Warrington; Hal J. Strangeways; Yvon Erhel; Sana Salous; S. M. Feeney; Nasir M. Abbasi; Louis Bertel; Dominique Lemur; François Marie; Martial Oger