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Propagation of ultrawideband chaotic radio pulses near the surface of the human body


A.S. Dmitriev, A.I. Ryzhov, T.I. Mokhseni

The problem of ultrawideband (UWB) chaotic radio pulses propagation in the presence of a human body is investigated as well as application of these signals for wireless Body Sensor Networks (BSN) The measurements of the parameters were conducted with a help of UWB direct chaotic transceivers with bandwidth 3-5 GHz, developed by Kotelnikov Institute of Radio Engineering and Electronics of RAS and “NanoXaos”. The results for the office environment are as follows: the path loss at a 1 m distance PL0=67.2 dB and path loss exponent γ=2.7 for CM3 channel when transceivers were placed in a line of sight (this result corresponds to the maximum range of 1.2 m between the transceivers); PL0=80.5 dB and path loss exponent γ=3.5 for CM3 channel when transceivers were placed not in a line of sight (this result corresponds to the maximum range of 0.4 m between the transceivers); PL0=49.3 dB and path loss exponent γ=1.5 for CM4 channel when transceivers were placed in a line of sight (this result corresponds to the maximum range of 23 m between the transceivers). Thus, the results of the conducted experiments (concerning maximum range) in CM4 channel meet the requirement for this channel model (5 m range). The obtained results illustrate that direct chaotic transceivers are capable of becoming a foundation for the new transceivers implementing IEEE 802.15.6 functionality for the use in WBAN.
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