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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2015-08-15
Characterization of an off -Body Channel at 2.45 GHz in an Underground Mine Environment
By
Moulay El Hassan El Azhari,

    Dr. Moulay El Hassan El Azhari

    University of Quebec in Abitibi-Temiscamingue (UQAT)

    Canada

    Homepage

Mourad Nedil,

    Prof. Mourad Nedil

    Applied Science

    UQAT (University of Quebec at Abitibi-Temiscamingue)

    Canada

    Homepage

Ismail Ben Mabrouk,

    Dr. Ismail Ben Mabrouk

    Department of Computer Science and Engineering

    UQAT/UQO

    Canada

    Homepage

Khalida Ghanem,

    Dr. Khalida Ghanem

    Division Architecture des Systèmes

    Centre de développement des technologies avancées

    Algeria

    Homepage

Larbi Talbi

    Professor Larbi Talbi

    Department of Computer and Engineering

    University of Quebec in Outaouais

    Canada

    Homepage

Progress In Electromagnetics Research M, Vol. 43, 91-100, 2015
doi:10.2528/PIERM15061504 | Google Scholar

Abstract
Underground mines are challenging environments for off-body wireless communication, since the signal propagation is majorly affected by small scale and large scale fading. The use of multiple antennas at the transmitter and the receiver sides is a known technique to combat fading and enhance capacity. In this paper, the channel parameters of a 2×2 Multiple-Input Multiple-Output (MIMO) off-body system are investigated in an underground gold mine and compared to the Single-Input Single-Output (SISO) system parameters. Measurement campaigns were conducted using monopole antennas at a center frequency of 2.45 GHz for both Line Of Sight (LOS) and None Line of Sight (NLOS) scenarios. The measured frequency responses are converted into impulse responses through an Inverse Fourier Transform (IFT). The results show that for a constant transmitted power, the path loss exponents at NLOS are smaller than their counterpart values at LOS. The channel capacity values decrease as the propagation distance increases and when the link is obstructed at NLOS. The RMS delay spread is generally increasing with distance for both LOS and NLOS situations. When a fixed Signal-to-Noise Ratio (SNR) is assumed, MIMO topologies improved the SISO capacity by roughly 8 bps/Hz. The channel characterization results demonstrate that the MIMO configurations provided a remarkable improvement in terms of capacity, coherence bandwidth, and time delay spread compared to the SISO topologies.
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Citation
Moulay El Hassan El Azhari, Mourad Nedil, Ismail Ben Mabrouk, Khalida Ghanem, and Larbi Talbi, "Characterization of an off -Body Channel at 2.45 GHz in an Underground Mine Environment," Progress In Electromagnetics Research M, Vol. 43, 91-100, 2015.
doi:10.2528/PIERM15061504
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