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.

Widened band antenna for mobile device

Abstract: PROBLEM TO BE SOLVED: To propose an antenna in which two waving slots are connected to a conductive patch. SOLUTION: This antenna for radio communication equipment provided with the conductive patch having the two waving slots, a ground, a short-circuit connection connecting the patch to the ground, and a feeder connection connected to the patch is disclosed. The antenna has a radiation diagram including a primary resonant band including frequencies 1950 MHz to 2100 MHz and having a width greater than 20%. The antenna can operate within a frequency domain covering UMTS, PCS, DCS and maybe, a GSM bands. An antenna of a similar type can be used on many types of devices that use different frequency bands, for instance, various frequency bands, etc., in each country. Radio communication equipment including the antenna is also disclosed.

GSM (Global System for Mobile Communication)-LTE/LTE-A (Long Term Evolution/ Long Term Evolution-Advanced) common-mode method and system

Abstract: The invention discloses a GSM (Global System for Mobile Communication)-LTE/LTE-A (Long Term Evolution/ Long Term Evolution-Advanced) common-mode method and system The method comprises the steps of: embedding a GSM bandwidth serving as a subband into an LTE/LTE-A system bandwidth for realizing common carrier frequency of a GSM and an LTE/LTE-A system, wherein when the GSM bandwidth serving as the subband is embedded into the LTE/LTE-A system bandwidth, the embedded positions keep away from a static pilot frequency and a static physical channel in the LTE/LTE-A system bandwidth; after embedding the GSM bandwidth serving as the subband into the LTE/LTE-A system bandwidth, when an RRC (Radio Resource Control) of the LTE/LTE-A system carries out resource planning, keeping away from the embedded GSM frequency band; and when an MAC (Media Access Control) of the LTE/LTE-A system carries out resource scheduling, keeping away from the GSM frequency band used by a local cell According to the invention, the defects of poor frequency spectrum utilization rate and low frequency spectrum efficiency of the GSM are made up through the LTE/LTE-A system, and the frequency spectrum frequency is greatly increased

Automated System for Measurement and Visualization of Electromagnetic Field in GSM 900, GSM 1800 and UMTS 2100 Bands

Abstract: This paper describes design and implementation of web based system for measurement of electromagnetic fields in GSM bands and visualization of the acquired results. Essential problems and their solutions are explained in details.

A reconfigurable low-pass/high-pass DR ADC suited for a zero-IF/ low-IF receiver

Abstract: This paper presents the design of a reconfigu- rable delta sigma analog to digital converter. Its main degree of freedom is the choice of the noise shaping between low-pass and high-pass. Thanks to this reconfig- uration parameter, the converter takes full advantage of both noise shapings and employs the most suited archi- tecture depending on the received standard. Moreover, the low-pass/high-pass reconfiguration makes the analog-to- digital converter compliant for both the low-IF and the zero-IF receiver architectures. The paper also presents a novel reconfigurable dynamic element matching technique which efficiently addresses the digital to analog converter mismatch for both the high-pass and the low-pass delta sigma modulators. The sampling frequency and the quan- tizer number of bits are likewise adjustable. A GSM/UMTS compliant delta sigma analog to digital converter including reconfigurable decimator has been designed in a 1.2 V 65 nm CMOS process. The high-pass modulator is employed in a low-IF receiver for the GSM mode to profit from its robustness against offset and 1/f noise. For the UMTS mode, the low-pass modulator is employed in a zero-IF receiver because of its lower sensitivity to clock jitter.

Vehicle-mounted combined antenna compatible with 5G

Abstract: The invention discloses a vehicle-mounted combined antenna compatible with 5G. The vehicle-mounted combined antenna comprises an LTE-MIMO antenna, a GPS navigation antenna, a V2X-MIMO antenna and a coaxial cable, wherein the LTE-MIMO antenna comprises two LTE antennas which are the totally same and are printed on two sides of a dielectric plate; the GPS navigation antenna adopts a double-layer ceramic structure; an upper layer of radiation patch and a lower layer of radiation patch generate two resonance points at a high frequency and a low frequency to form a double frequency; a metal feed probe is adopted for feeding, and the antenna is arranged in the middle of the dielectric plate. The V2X-MIMO antenna comprises two identical V2X antennas, and an inverted-L-shaped metal vibrator is adopted for an antenna vibrator, and is fixed at the front end of the navigation antenna through soldering tin; and the antenna feeds the single antenna through the coaxial cable. The antenna is simple and compact in structure, and low-frequency bands such as the LTE 700, LTE 800, GSM 850, the GSM 900 and the like, and the high-frequency bands such as DCS 1800, PCS 1900, UMTS 2100 and LTE 2300/2500 and the like are realized by utilizing the limited space at the same time.