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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

机译:在典型的操作环境中,对用户的手和头顶接收电平的影响以及GSM移动电话的自适应功率控制进行了研究

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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 broadcastrncontrol 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.
机译:无线个人通信的当前发展需要全面了解手机天线与附近人体之间的电磁相互作用。在这项工作中,以各种配置(使用和不使用用户的手;使用和不使用用户的头,以及它们的组合)评估了手机与人体之间的交互,以获得系统链接评估总体性能的统计平均值。这些测量是使用随机场测量(RFM)方法执行的,因此可以获取典型操作环境中有关人机交互的大量数据,并测量接收到的RF信号强度(RXLEV)和输出功率水平(TXLEV)在移动台上。 RXLEV和TXLEV在两个保加利亚GSM移动运营商(Mtel和Vivatel)的网络空中接口上进行了测量。上行和下行测量均在三个城市的市区进行。每次测量都是在建筑物内进行的,该建筑物包括移动站和基站之间电磁波的视线传播和非视线传播。结果表明,当广播控制信道(BCCH)电平高达-60 dBm时,用户的手和头会在接收到的RF信号强度上引起更大的变化。同样,MS的接收RF信号强度和输出功率水平的改变受到更大的用户手和头部尺寸的影响。通话位置中用户头和手的存在对接收RF信号强度变化的影响范围从14.21 dBm到19.1 dBm(男人)和8.5 dBm到12.05 dBm(女人)。与没有用户手和头的输出功率电平相比,用户手和头的存在使移动台的输出功率电平分别提高了12 dBm至14 dBm(男人)和10 dBm至12 dBm(女性)。

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