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GSM networks consist of cells that can support mobile users. Due to this mobility, it is expected that the network model can be different than that of wired networks which do not support mobile users. In our study, using empirical data provided by a GSM operator, TURKCELL, we analyze the associated network model from the mobility perspective. We first show that the handover rate of a regular cell...
Almost all mobile image search applications available in the market only support text queries, which it is sometimes difficult to describe the needs in text and the text input is inconvenient on small devices. This paper proposed a mobile phone image search application that can perform practical image search processing in real-time. The early stage of the project is aimed to develop the application...
In this paper, the results of outdoor-to-indoor multiple-input multiple-output (MIMO) channel measurements at 780 MHz are presented. The motivation for these measurements was to provide actual measurement data needed to extend the International Mobile Telecommunications -Advanced (IMT-A) channel models to the frequencies around 400 - 900 MHz. There are publications reporting measurement results for...
This paper presents a comprehensive simulation study on the performance of broadband coupling-element-based multiantenna structures on a mobile terminal at the 2000 MHz Universal Mobile Telecommunications System (UMTS) frequency band with varying two significant hand effects; vertical position of hand along terminal chassis, and distance between hand palm and terminal chassis. The results reveal that...
Performance bounds provide a solid theoretical ground for comparing different localization methods. Similarly to the actual performance, they depend on two factors, namely the accuracy of the available data that are used for localization and the geometry of the network. While the impact of the accuracy of the available data has been studied extensively, the literature on the impact of network geometry...
In the WIMAX (802.16e) standard several small medium access control (MAC) packets may be aggregated to form a MAC burst, forwarded to the physical (PHY) layer The burst transmission is a mechanism to allow multiple MAC protocol data units (PDUs) belonging to the same video channel to be transmitted / received in an aggregated way, in order to enable power saving at the mobile station, by putting the...
This paper presents a generalized expression for space-time cross correlation between signals at receiver antennas on a moving mobile in 3D space. This expression, which is a function of scattering environment coefficients, antenna locations and velocity of the mobile unit, will be useful for designers of communication systems in understanding space time correlation under various channel environments...
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