russian DonNTU | Masters portal DonNTU

Master of DonNTU Molokovskiy Igor

Molokovskiy Igor

Donetsk National Technical University

Faculty of
Computer Information Technologies and Automatics

The Chair of
Automatic and Telecommunications

Speciality
Telecommunication Systems and Nets

Theme of master's work
"Research of work of the telecommunication systems in the conditions of coal mines"

Leader of work
c.e.s. Turupalov V. V.

MASTER’S DEGREE THESIS

Introduction and Actuality

Ukrainian coal wines suffer from a great number of accidents. As a result, there is a high level of injuries, including those leading to death, significant consequential losses due to production cease. The implementation of loud speaking technological communications, as well as radio communications allows to establish and additional communications link to portable o stationary communication devices. This link can allow to listen to machine operation in explosive layers.

Goals and Objectives:

  • review of existing radio access technologies and analyzing of possibility of their operation in coal mine environments;
  • taking environmental influence into account when calculation QoS parameters;
  • wireless network protocols analysis.

    • Review of existing wireless network technology.

    Wireless network all anymore use popularity. During a few years they passed the process of standardization, a data rate rose, a price became accessible. Today wireless networks allow to give connecting wherein cable connection or necessary complete mobility is labouredly. Thus wireless networks compatible with wire networks.

    The Bluetooth Technology

    Technology uses the small transceivers of small cruising radius, that work on the frequency unlicensed in most countries 2.45 GGts and use a method by expansion of the FHSS spectrum (Frequency Hopping Spread Spectrum - hopping alteration of frequency, 1600 lope/sek., batch communication with the temporal multiplexing, 79 working channels). A radio channel provides speed 721 Kbit/s. Depending on power of transmitter, the Bluetooth devices divide by three classes:

  • Class 1 –up to 100 mVt (maximal distance on the opened space of to 100 m);
  • Class 2 - up to 2,5 mVt (maximal distance on the opened space of to 15 m);
  • Class 3 - up to 1 mVt (maximal distance on the opened space of to 5 m).

    • Basic highs of technology:

  • simplicity of the use of the prepared modules;
  • small sizes;
  • safety of information transfer (authentification, code);
  • high level of standardization.

    • Basic lows of technology:

  • impossibility of construction of networks of difficult topology;
  • more (on comparison with the ZigBee networks) of energy consumption.

    • The ZigBee Technology

    A data rate together with housekeeping information in the Zigbee networks makes 250 kBit/c. The ZigBee technology has frequency channels in the ranges of 868MGts, 915MGts and 2,4 GGts. Most data rates and the greatest noise immunity are achieved in the range of 2,4GGts, therefore most producers of microcircuits let out transceivers exactly for this range in which 16 frequency channels with a step are foreseen 5 Mhz.

    Òåõíîëîãèÿ NanoNET

    Possibility to pass data on enough high speeds (to 2 Mbit/s) and more high noise immunity on comparison with other technologies of range 2,4 GGts is the basic features of the Nanotron transceivers. Distance of transmission on the opened space makes hundred meters. By innovation in this season permanent new transceivers Nanotron nanoLOC TRX, which additionally own the function of decision of location. Association in one crystal of functions of wireless data communication and decision of location opens new possibilities for the systems of radio frequency authentication and data capture.

    By comparison to the Wi - Fi technology which also has the wide bar of frequency channel, the Nanotron transceivers have the best correlation the "distance of transmission / speed of transmission / energy consumption" due to that primary treatment of linear-frequency impulse is executed by an analog method. Thus, the Nanotron transceivers can be used in the worn devices which work from batteries.

    Speed of transmission is the basic features of the NanoNET TRX transceivers to 2 Mbit/s, cruising radius of to 900 meters on the opened space and built-in MAC-inspector with support of different access methods to the environment of transmission. Power of transmitter can change in scopes from 1 mkVt to 6.3 mVt.

    © DonNTU 2008, Molokovskiy Igor