A comparison of different modulation techniques performances in an underground multiuser communications scenario

• Autorzy: Badescu A.-M.

Identyfikatory

DOI

10.2478/v10065-012-0015-1

• Języki publikacji: EN

Abstrakty

EN

The potential use of typical commercial communication systems with ultra high frequencies for the underground emergency/military situations will be investigated, as commercial systems have already a fully developed market that makes them cheap and reliable. The possible usage of broadband techniques like CDMA in the direct sequence will be studied because most commercial communication systems have already been designed to support multiple users, as the underground propagation has many possible applications. The performances of both modulation techniques are evaluated from the point of view of the quality of the signals, power spectral density and the effect that the propagation medium has on the transmitted signals such that the best modulation technique is determined. The 16QAM and QPSK modulations (two of the most popular modulation techniques in the terrestrial wireless system) are compared in a scenario where a number of underground sources share the same physical channel (and antenna) - the receiver is placed at the ground level so the generated signals must propagate through the dielectric layer in order to reach it. The transmitted power, electric and magnetic fields as well as occupied bandwidth are also calculated.

Słowa kluczowe

EN

modulation techniques; commercial communication systems; CDMA; 16-QAM; QPSK

• Wydawca: Wydawnictwo UMCS
• Czasopismo: Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica
• Rocznik: 2012
• Tom: Vol. 12, no. 2
• Strony: 73--85
• Opis fizyczny: Bibliogr. 12 poz., rys., tab.

Twórcy

autor

Badescu A.-M.

• Dept. of Telecommunications, University POLITEHNICA of Bucharest, bd. Iuliu-Maniu, nr. 1-3, Bucharest, Romania

Bibliografia

• [1] Mo L., Yunhao L., Underground coal mine monitoring with wireless sensor networks, ACM Transactions on Sensor Networks (TOSN) (2009): 5.
• [2] Connolly A., Goodhue A., Miki C., Nichol R., Saltzberg D., Measurements of radio propagation in rock salt for the detection of high-energy neutrinos, Nuclear Instruments and Methods in Physics Research A 599 (2009): 184.
• [3] Akyildiz I. F., Stuntebeck E. P., Wireless underground sensor networks: Research challenges, Ad Hoc Networks 4 (2006): 669.
• [4] Sterling C., Military Communications: From Ancient Times to the 21st Century, ABC-CLIO: USA (2008).
• [5] Mognaschi E. R., On the possible origin, propagation and detectability of electromagnetic precursors of earthquakes, Atti Ticinensi di Scienze della Terra 43 (2002): 111.
• [6] Bandyopadhyay L. K., Chaulya S. K., Mishra P. K., Wireless Communication in Underground Mines - RFID-based Sensor Networking, Springer-Verlag: New York (2009).
• [7] Bandyopadhyay L. K., Mishra P. K., Kumar S., Narayan A., Radio frequency communications systems in underground mines; http://www.wvminesafety.org/PDFs/communications/Additional%20Documents/Communication _Systems_in_Underground_Mines.pdf (20.06.2011).
• [8] Raab F. H., Signal processing for through-the-earth electromagnetic systems, IEEE Transactions on Industry Applications 24 (1988).
• [9] Geophysical Technologies for Detecting Underground Coal Mine Voids, July 28-30, 2003, Lexington, Overview of Mining Industry of the Future; http://www.fhwa.dot.gov/engineering/geotech/hazards/mine/workshops/ktwkshp/ky0302.pdf
• [10] Nedil M., Denidni T. A., Djaiz A., Habib A. M., A new ultra-wideband beamforming for wireless communications in underground mines, Progress In Electromagnetics Research M 4 (2008): 1.
• [11] Halunga S., Fratu O., Vizireanu D., Telecommunications systems with CDMA, ETF: Bucharest (2000).
• [12] Annan A., Davis J. L., Gendzwill D., Radar sounding in potash mines, Saskatchewan, Canada. Geophysics (1988).