نتایج جستجو برای: سیستم gsm
تعداد نتایج: 78769 فیلتر نتایج به سال:
Today electronic communication technology became more advanced to give solutions in real time.. In this paper use the smart and efficient energy metering system uses GSM network.GSM is most popularly used because of its vast coverage area and its cost effectiveness. It is wireless two way communication between utility company and energy metering system..GSM based smart efficient energy meter se...
GSM-Railways (GSM-R) is an obsolete mobile technology with a number of shortcomings in terms of capacity and capability. These shortcomings become a major issue for railways as GSM-R may limit the number of running trains in some areas and it cannot support advanced data services. Hence, alternative technologies, such as LTE, have to be considered as a future railway communication technology. T...
The integration of CDMA and GPS within a single mobile terminal, in support of the FCC E911 initiative, has greatly benefited from the GPS-based synchronisation of the CDMA network. Similar synchronisation is not available in GSM and W-CDMA networks which are, by design, asynchronous in operation, and this makes GPS integration into GSM and W-CDMA mobile terminals more complex and costly. Duffe...
Turbo-detection applies the “turboprinciple” to iterative equalization and decoding of data transmitted via frequency selective channels. The performance of turbo-detection strongly depends on the ISI (Intersymbol Interference) introduced by the modulator and the waveform channel. In order to achieve higher data rates within GSM (Global System for Mobile Communications), 8PSK modulation will ...
2. Overview of GSM SIM Based Authentication This paper discusses approaches to authenticating users with open platforms, such as notebook PCs, for WLAN access using SIM cards. Using SIM cards to authenticate WLAN access is desirable by wireless operators as this approach minimizes additional infrastructure investments since the existing authentication processes and equipment are re-used. This p...
This paper proposes the solution for improving the services provided by the transport management by using GPS and GSM modem integration. The system mainly consists of three modules. (1) Bus station module (2) Bus module (3) Base station module. The modules are connected to PC and GSM modem. The initial information containing the bus number and license plate from bus station module is sent to bu...
Background and Purpose—We sought to assess the reproducibility, interobserver variability, and application to clinical studies of a new method for the quantitative assessment of carotid plaque echogenicity. Methods—Carotid plaques were scanned with the use of ultrasound, and their images were stored in a computer. They were normalized by assigning certain gray values to blood and adventitia, an...
1.1 Good sources for subscriber numbers and other statistics are, e.g., www.gsmworld.com, www.3gpp.org, www.3gpp2.org, www.emc-database.com, www.3g.co.uk, www.regtp.de ... 1.2 Today’s GSM operators add the new 3G air interfaces of UMTS to their existing GSM/GPRS infrastructure networks. Current GSM/GPRS networks already offer packet and circuit switched data transmission following the Release 9...
«باگذشت ۲۵ سال از عمر ارتباطات سیار، تعداد کاربران تلفن همراه ازتعداد کل کاربران تلفن ثابت) با عمر بیش از ۱۲۰ سال( پیشی گرفته است.» این جمله بهتنهایی میتواند نشانگر رشد سریع ارتباطات سیار در سالهای اخیر باشد که حجم قابل توجهی از صنعت مخابرات را به خود اختصاص داده است. در ایران نیز برای گسترش ارتباط سیار سرمایهگذاری بسیار سنگینی به عمل آمده و مشترکین نیز برای استفاده از این سرویسها هزینه...
Dual-function radar-communications (DFRC) systems implement radar and communication functionalities on a single platform. Jointly designing these subsystems can lead to substantial gains in performance as well size, cost, power consumption. In this paper, we propose DFRC system, which utilizes generalized spatial modulation (GSM) realize coexisting communications waveforms. Our proposed GSM-bas...
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