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.

A TD-SCDMA/GSM single-antenna mobile telephone double-mode double-standby realizing method

Abstract: A method for realizing double-mode standby of TD-SCDMA/GSM mobile phone with single antenna includes adding a low-pass filter between antenna and GSM 900/DCS1800 radio frequency module or adding a high-pass filter between antenna and TD-SCDMA radio frequency module or adding both filters simultaneously to suppress interference to each other of two systems for realizing double-mode double-standby function.

Multi-Band Microstrip Antenna Design for Wireless Energy Harvesting

Abstract: The purpose of this work is to propose an efficient microstrip rectenna operating on 900/1800 MHz GSM bands and the 2.4 GHz ISM band. The receiving antenna with presented joint feeding line implemented in a multilayer substrate. The reflection coefficient at the input of the optimized multi-Band microstrip patch antenna is below -10dB over the every frequency band. The measurement results are in excellent contract with the CST STUDIO SUITE 2011 simulation results.

Frequency selective smart shield design for wireless signals

Abstract: In this paper a design for a broadband, light weight and low cost smart shield frequency selective device is proposed. The device consists of a dual layer printed circuit board patch array and is capable of absorbing WLAN signals in the frequency range around 5.5 GHz, whilst allowing almost unitary transmission outside this range, for example the GSM frequency band ranging from 0.8 to 2.1 GHz. Therefore it can effectively be utilized in telecommunications, radomes and as a shielding structure in electronic devices.

Automation of PV farmers pump

Abstract: The primary aim of this project is to develop and atomize the PV farmers pump considering the power supply, direct current (DC), Alternating current (AC), inverter frequency, GSM technology, a well, water level in the well, submersible monoblock pump. Here we introduce an advanced technique with GSM (Global Service for Mobile communication) module. The PV farmers pump which work by utilizing the energy from the SOLAR ARRAYS and the power from the PV panel are stored in a battery. The power from the battery is inverted and given to the pump for irrigation. This pump is also controlled by the GSM module. The use of GSM mode is to start and stop working of pumps using mobile phone; the water level monitoring is also done by the GSM mode which this also provides the message the status for each hour. This is done with the embedded C in PIC16F877A microcontroller. The main advantage of this project is optimizing the power and also saving government's free subsidiary electricity (22% of total power production in India). This proves an efficient and economy way of irrigation and this will automate the agriculture sector.

Sensitivity degradation and antenna isolation analyses for a multi-operator global systems for mobile communication base transceiver stations

Abstract: In other to mitigate challenges associated with the expansion of Global System for Mobile Communication (GSM) systems, infrastructure sharing have been proposed and adopted by some GSM operators. When infrastructure sharing is done, there is the possibility of degradation of quality of service due to Electromagnetic Compatibility issues, interference between operators, sensitivity degradation, increasing noise floor, antenna isolation requirement issue. This paper analyses the sensitivity degradation and the effects of spatial separation on antenna isolation requirement of Base Transceiver Station (BTS) receiver for a multi-operator mobile cellular systems. The data used were extracted from standards of organisation like European Telecommunications Standards Institute (ETSI) standards and others. Antenna dimension were obtained from physical observations of BTS site. By comparison with identified metrics in the standards, we verified that the number of operators that can share infrastructure is limited by the allowable sensitivity degradation. It was noted that an antenna isolation of 70dB can be achieved for GSM 900 band antennas and when GSM 1800 band antennas are used, 90dB antenna isolation is achievable greater than the minimum recommendation of 30dB. Keywords: Antenna isolation, base station, BTS, GSM, infrastructure sharing, receiver sensitivity, sensitivity degradation