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This paper proposes a real-time self-adaptive approach for accurate path loss estimation in underground mines or tunnels based on signal strength measurements from heterogeneous radio communication technologies. The proposed model features simplicity of implementation. The methodology is validated in simulations and verified by measurements taken in real environments. The proposed method leverages accuracy of positioning matching the existing approaches while requiring smaller engineering efforts.

In the report we consider the basic prospects of development of Strained-Silicon technology in a communication facility, designs and principle of action MOSFET and the better hetero bipolar transistor (HBT) for wireless integrated circuit (IC), which working on frequencies of exceeding 350 GHz, analyze and compare performance data of HBT with GaAs and SiGe.

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