GSM frequency bands

About: GSM frequency bands is a research topic. Over the lifetime, 559 publications have been published within this topic receiving 5067 citations.

Temporal Variation of Duty Cycle in the GSM Bands

Abstract: In a quest to efficiently manage the scarce spectrum, researchers, governments and regulatory bodies have been conducting spectrum occupancy measurements in various countries across the world. This paper describes the results and analysis derived from a long-term spectrum occupancy measurement conducted in GSM bands at a fixed location in the Faculty of Communication and Information sciences, University of Ilorin, Nigeria. The measurements data were collected for 4 weeks continuously for a period of 24 hours. The data gathered were used to determine the temporal variation of duty cycle in all the bands. The GSM 900 and GSM 1800 have average spectrum occupancy of 10%, and 9% respectively. The results showed some form of temporal variation due to variable activity in days and nights, weekdays and weekends. This is an effort to develop spectrum usage repository for big data analytic studies. This would help researchers and policy makers to understand the activities going on in the spectrum bands so that they can device intelligent spectrum models for effective utilization.

The ABM 8057 utilization for SEMONT's EMF monitoring in a closed room

Abstract: The Serbian Electromagnetic Field Monitoring Network — SEMONT has started with test monitoring of electromagnetic field (EMF) in a closed room. In this paper, the case study of the high-frequency electric field strength monitoring is presented, utilizing Narda AMB 8057/03 monitoring station. The monitoring procedure has been simultaneously performed in frequency ranges of 100 kHz–7 GHz, GSM 900, GSM 1800 and UMTS 2100, in a closed room of largest amphitheater of the Faculty of Technical Science, University of Novi Sad. The monitoring was conducted during real daily conditions and student's presence inside of the amphitheater, showing that the high-frequency electric field strength values are far below the Serbian's prescribed reference levels.

SAR values comparison between GSM and 3G

Abstract: The paper analyses the level of electromagnetic radiation produced by the mobile terminals and its correlation with SAR value, until now the only method to quantify the harmful effect of using this mode of communication. It is shown that the modern 3G (UMTS) network, although uses an emission power much lower than the 2G (GSM) network and produces a lower mean exposure level, still leads to the highest SAR level. This fact is indicated by manufacturers and confirmed by comparative interlaboratory measurements, one of the latest being presented in the paper. The causes of this situation and the validity limits of the present SAR concept are explained. Finally, the reduction of the SAR test duration for 3G mobile phones is proposed, by giving up in a first stage, the measurements on GSM channels.

Design of a printed elliptic reconfigurable dual band-rejected UWB micro-strip fed antenna

Abstract: A printed elliptic UWB reconfigurable dual band-rejected antenna operating from 0.75 to over 6GHz was designed and performed for multi-standard telecommunication systems such as GSM 850, GSM 900, LTE, ISM 868, WiFi, WLAN, WiMAX... The main antenna consists of a very high selective UMTS (2.1 GHz) band-rejection micro-strip fed monopole. The reconfigurable discarded bands were obtained by printing two Open Loop Resonators (OLRs) on the both edge sides of the feeding line with same dimensions. By loading a varactor diode on the first OLR and an active inductor on the second one, the rejected bands become easily controllable. Hence the frequency reconfigurability is produced. Initial results are obtained by using a SMV1405 varactor diode and lumped inductors. Simulated and measured results are presented and discussed.

Transmitter filter arrangement for multiband mobile phone

Abstract: Filter structure for use in a multiband dual-mode mobile telephone. In particular, the operation of the mobile phone may include a band-stop filter and at least a series and shunt acoustic resonator for producing a deep V-shaped in the reception band in W-CDMA mode. The band reject filter further comprising a plurality of inductance elements, for matching the resonator at the passband frequency static capacitance. The mobile telephones may also operate in the frequency band 1800 and 1900GSM. Operably connected to the bandstop filter harmonic suppressor, to eliminate the third harmonic of these GSM bands. The mobile telephone can also operate in the lower GSM band, a harmonic filter can share an antenna path with the band-stop filter.