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.

The effects of UWB interference on GSM systems

Abstract: The effects of UWB interference on GSM 900 and GSM 1800 systems are considered for current FCC regulations as well as proposed ETSI emission limits for the criteria of either a 1 dB loss in the SINR or a loss leading to the minimum required SINR at the cell edge. UWB densities are computed for different GSM reuse factors and the results show that no harmful interference is to be expected for GSM 900 systems. In the case of GSM 1800 systems, the proposed ETSI emission limits are found to be offering sufficient protection whereas the current FCC regulations would result in significant interference.

An integrated low-phase-noise voltage controlled oscillator for base station applications

Abstract: Designing voltage-controlled oscillators (VCO) for a Global System for Mobile Communications (GSM) receiver is a challenge due to the phase noise requirement. The requirement comes from the stringent in-band blocking characteristics in the GSM standard. Based on the reference sensitivity, the blocking requirement, and the assumption of C/I=9 dB, the calculated phase noise specifications are summarized in this paper. Because typical VCO phase noise roll-off around 1MHz offset has a slope of 20 dB or 30 dB per decade, the key specifications are at offsets of 600 MHz and 3 MHz for Mobile Station (MS) and 800 kHz for Base Transceiver Station (BTS). The table is sorted by the difficulty of the requirement, with the easiest (DCS 1800 MS) on the left and the most stringent (GSM 900 BTS) on the right.

Transmission of RF signals through energy efficient window using FSS

Abstract: Focusing on the radio frequency (RF) transmission through energy saving window, this paper presents the transmission characteristics of a dual-bandpass frequency selective surface (FSS) for GSM 900 MHz and 1800 MHz frequency bands used in GSM system. Through simulation, better transmission and less heat loss has been analyzed and investigated in this paper. Better stability has been achieved for both perpendicular (TE) and parallel (TM) polarizations at 0° incident angle.

Design of Ultrawideband Mobile Phone Stubby Antenna (824 MHz-6 GHz)

Abstract: An ultrawideband stubby antenna that covers all frequency bands between 824 MHz and 6 GHz, which include GSM 850 and 900, GPS, DVB-H US, DCS, PCS, UMTS, BT, WLAN 802.11b/g and WLAN 802.11a, with a VSWR better than 2.7:1 is described in this paper. The design procedure involves obtaining a wideband resonance from 1-6 GHz and using a matching network to compensate for the high capacitance of the antenna at the lower frequency band below 1 GHz. Parametric studies of this antenna are presented in this paper. The design was experimentally verified by constructing an ultrawideband antenna with a volume of 5 * 8 * 30 mm3. It is significant that the designed ultrawideband stubby antenna maintained a good impedance matching and radiation efficiency at all bands. An efficiency between 55 ~ 65% is achieved in the lower band including 824 ~ 960 MHz band required for the GSM 850 and GSM 900 systems, and an efficiency value of 67 ~ 88% is achieved at the rest of the bands starting with the GPS at 1575 MHz to 6 GHz.

Rigorous design of RF multi-resonator power harvesters

Abstract: In this paper an integrated design methodology to predict the real RF to DC conversion capability of power harvesters is tackled. By combining nonlinear harmonic-balance-based analysis with electromagnetic simulation the method is able to compute the actual RF power at the rectifier input in general operating conditions: that is for any near-field /far-field behavior of the antenna and for any direction of incidence and polarization of the incoming RF wave. This approach makes use of a new definition of the rectifying antenna (rectenna) performance simultaneously accounting for its radiation and nonlinear behavior. The effectiveness of the method is demonstrated through the comparison between computed and experimental performance of a multi-band circularly polarized rectenna, both in rigid and wearable implementation. Such antennas have been designed to harvest RF energy from different wireless standards (GSM 900, GSM 1800 and WiFi), commonly present in civil environments.