An investigation of the effects from the user’s hand and head over received level and adaptive power control of a GSM mobile phone in typical operating environment |
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Authors: | Nikolay T Atanasov Gabriela L Atanasova |
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Institution: | (1) Department of Wireless Communications and Broadcasting, Higher College of Telecommunications and Posts, 1 “Acad. Stefan Mladenov” Str., 1700 Sofia, Bulgaria;(2) Department of Telecommunication Technologies, Higher College of Telecommunications and Posts, 1 “Acad. Stefan Mladenov” Str., 1700 Sofia, Bulgaria |
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Abstract: | Current evolution of wireless personal communications has necessitated a comprehensive understanding of electromagnetic interactions
between handset antennas and nearby human body. In this work the handset–human body interactions were evaluated in various
configurations (with and without user’s hand; with and without user’s head, and combinations of them) in order to obtain statistical
averages of the overall performance for system link evaluations. The measurements were performed using the random-field measurement
(RFM) method, and thus the acquisition of large amounts of data about human–mobile phone interactions in typical operating
environment with measured the received RF signal strength (RXLEV), and the output power level (TXLEV) on mobile station. The
RXLEV and the TXLEV was measured over the air interface in the networks on two Bulgarian GSM mobile operators (Mtel and Vivatel).
Both uplink and downlink measurements were performed in urban area in three cities. Each measurements were carried out in
a building included both line-of-sight and non-line-of-sight propagation of the electromagnetic waves between mobile station
and base station. The results showed that the user’s hand and head induces more significant changes on the received RF signal
strength in case when broadcast control channel (BCCH) levels are up to −60 dBm. Also the alterations of receiving RF signal
strength and output power level of the MS are influence stronger from the larger size of the hand and head of user. The influence
from presence of the head and hand of the subscriber in talk position over the alteration of the receiving RF signal strength
is in boundaries from 14.21 dBm to 19.1 dBm (man) and from 8.5 dBm to 12.05 dBm (woman). The presence of the user’s hand and
head increased the output power level of mobile station with 12 dBm to 14 dBm (man) and with 10 dBm to 12 dBm (woman) compare
to output power level without user’s hand and head. |
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Keywords: | Power control Received level GSM mobile phone Handset-human body interactions Typical operating environment |
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