Radio-channel characterization of an underground mine at 2.4 GHz

Nerguizian, Chahé; Despins, Charles; Affes, Sofiène; Djadel, M.

doi:10.1109/twc.2005.853899

Cited by 114 publications

(57 citation statements)

References 22 publications

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“…As explained by Sun and Akyildiz [17], the delay spread in an underground surroundings is influenced by the number of significant modes which exists and the transmitter receiver distance. The same conclusion on the propagation behavior in underground environments was obtained in [3,4]. The mean excess delay and the maximum excess delay have also been computed for a threshold level of 15 dB.…”

Section: Time Propertiessupporting

confidence: 57%

Experimental Characterization of a Mimo Underground Mine Channel at 2.45 GHZ

Coulibaly¹,

Mnasri²,

Nedil³

et al. 2013

PIER B

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Abstract-In this paper, an experimental characterization of a MIMO underground channel is presented. A simple statistical model is proposed at 2.45 GHz. The channel is characterized in terms of path loss, shadowing, RMS delay spread, and capacity. The measurements are carried out in an underground mine, which is a harsh confined environment. The path loss model is extracted from measured data for the line of sight (LOS) and non-line of sight (NLOS) scenarios for both MIMO and SISO channels. The path loss exponent in LOS is less than 2 in MIMO and SISO as the environment has a dense concentration of scatterers. A statistical study is carried out to find the delay spread. For MIMO and SISO, there is no relation between the delay spread and the transmitter receiver distance. Furthermore, the delay spread of the MIMO is less than the one of the SISO channel in the LOS measurement campaigns. Aikake information criteria are used as a goodness of fit for different statistical distributions to represent the delay spread. According to the calculated capacity for a constant signal to noise ratio in LOS case, the transmission performance is significantly improved by using the MIMO scheme over the traditional SISO. Therefore, MIMO is an ideal candidate for future wireless underground communications.

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Section: Time Propertiessupporting

confidence: 57%

Experimental Characterization of a Mimo Underground Mine Channel at 2.45 GHZ

Coulibaly¹,

Mnasri²,

Nedil³

et al. 2013

PIER B

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“…The model of wireless channel presented in this study is described in [7] . Since other details of the propagation experiments and modelling are given in [7] , we are going to summarize here only the fundamental issues.…”

Section: Resultsmentioning

confidence: 99%

“…Since other details of the propagation experiments and modelling are given in [7] , we are going to summarize here only the fundamental issues. Their channel was modulated using the measurements which were made in an experimental underground mine.…”

Section: Resultsmentioning

confidence: 99%

Throughput-Delay Trade-Off for Slotted Aloha Multiple Access with Capture Effect

Chehri¹,

Fortier²,

Tardif³

2009

J. of Computer Science

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Problem statement: Medium Access Control (MAC) protocols are one of most important research issues in communication and networking. There have been proposed several MAC protocols in wireless as well in wired networks. Approach: ALOHA-based protocol is the simplest one, being able to provide prompt access, reliable channels and support for quality of service. However its limited capacity, low throughput and excessive delays make it not suitable for several applications. Results: So there had been many efforts devoted to increase its performance, one of them is the capture effect. With capture effect, the packets arriving with the highest power had a good chance to be detected accurately, even when other packets were present. Conclusion: In this study, a throughput-delay tradeoff was investigated to improve the network performance. The capture threshold was assigned to the highest throughout/time delay ratio. Therefore, the capture threshold which provided a high throughput and low time delay was selected by a central node.

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“…Delay spread has been also given. In [13], the propagation modes and the temporal variations along a lift shaft in UHF band have been given. Moreover, propagation in corridors, as well as tunnels and urban street canyons has been studied in [14,15].…”

mentioning

confidence: 99%