CSDL Bài trích Báo - Tạp chí
chủ đề: Telecommunications
1 Circuit design to improve security of telecommunication devices / Hengameh Bahrami, Khosrow Hajsadeghi // IEEE .- 2015 .- Vol.2 .- P. 171 - 175 .- 624
Security in mobile handsets of telecommunication standards such as GSM, Project 25 and TETRA is very important, especially when governments and military forces use handsets and telecommunication devices. Although telecommunication could be quite secure by using encryption, coding, tunneling and exclusive channel, attackers create new ways to bypass them without the knowledge of the legitimate user. In this paper we introduce a new, simple and economical circuit to warn the user in cases where the message is not encrypted because of manipulation by attackers or accidental damage. This circuit not only consumes very low power but also is created to sustain telecommunication devices in aspect of security and using friendly. Warning to user causes the best practices of telecommunication devices without wasting time and energy for fault detection.
2 Inherent noise in ultra-wideband heterogeneous telecommunication channels / K.S. Sunduchkov, S.E Volkov, A.L. Golik, Ya. Liakhovskyi, A.K. Sunduchkov, Yu.I. Khilko // .- 2013 .- Vol.2 .- P. 291-293 .- 624
The value of the S/N in different parts of a heterogeneous network of fiber optic links with two laser beams, a photodetector, in the millimeter wavelength radio channel to a demodulator in a decoder-detector at the entrance of which S/N ratio of 16.8 dB can be provided, is analyzed. It provides high quality of reception of signals at the respective modulation.