Villamosmérnöki tudományok
Browse by
Recent Submissions
-
Optikai-mikrohullámú szűrés fénytávközlő rendszerek intenzitászajának csökkentésére
(2005)Elsôsorban rövidtávú üvegszálas összeköttetések, így helyi, városi hálózatok, valamint optikai-mobil rendszerek esetén alézerdiódák relatív intenzitászaja (RIN) az átvitel legjelentôsebb zajforrása. A következôkben az ... -
Mikrohullámú reflexiómérés hibájának csökkentése minimális érzékenységű kalibráció alkalmazásával
(1993-08-09)Explicit kifejezést adunk a hibakorrekció utáni reflexiós tényezőnek a kalibráló elemek reflexiós tényezőire vontakozó érzékenységeire és megmutatjuk összefüggésük invarianciáját. Az érzékenységek összegének állandósága ... -
Availability-Aware E-band Wireless Extension of Fiber-Access
(2022-04-29)The paper discusses availability of Gigabit/s (Gbps) fiber-optical access that are extended with E-band millimeter-wave (mmW) radio. Calculation method is shown for fixed fiber-wireless system, in which ‘fiber-like’ SLA ... -
New optomixer surpassing photodetection at microwaves
(1997-09-03)The properties of a new optomixing method are investigated and compared to the performance of the photodetection. This new method offers significantly higher output signal level compared to the direct photodetection. -
Eight-Octave Bandwidth Optical Receiver Using Distributed Amplification
(1997-09-03)A new approach us presented utilizing low-noise distributed amplification based on a hybrid integration technology, This way eight-octave bandwidth has been achieved with a responsivity characteristics flat from 40 MHz up ... -
New Carrier Generation Approach for Fiber-Radio Systems to Overcome Chromatic Dispersion Problems
(1998-06-07)A new approach for the generation of millimeter-wave (MMW) carriers in fiber-radio systems is presented. A subharmonic of the carrier is transmitted to the radio nodes over the fiberoptic network. At each base station the ... -
Improved Optical-Microwave Mixing Process Utilizing High-Speed Photo-diodes
(1996-09-09)Mixing of lightwaves and microwaves offers new perspectives for the reception of subcarrier multiplexed (SCM) optical signals, Berceli (1). The received signal can be selected more easily and thus the receiver is significantly ... -
Throughput Estimation of K-zone Gbps Radio Links Operating in the E-band
(2022-04)Nowadays covid virus changes our work, learning and life-style. Broadband telecommunication channels are required for remote work, e-learning and video conferencing. Optical-fiber access offers the required wide bandwidths ... -
Gbit Radios for the Mobile Anyhaul
(2022-02-04)Traditionally, the microwave and millimeter-wave (μ/mmW) links have been limited by thermal noise. Long microwave hops had to connect distant sites of several kilometers. The antennas were mounted on high altitude towers. ... -
Remote Upconversion in Microwave Fiber-Optic Links Employing an Unbalanced Mach-Zehnder Interferometer
(1999-07-23)We present a new technique for remote upconversion by inserting a passive all-optical device in the microwave (MW) fiber-optic link. Using a semiconductor laser directly modulated by two MW signals and an unbalanced ... -
Reduction of Measurement Error in Microwave Reflectometers by Minimum Sensitivity Calibration
(1993-07-08)Explicit formulas for the sensitivities of the error corrected reflection coefficient (RC) with respect to the RCs of the calibrating elements, and the invariance of their sum are presented. Under the condition that the ... -
Microwave Hop-Length and Availability Targets for the 5G Mobile Backhaul
(2019-07-03)Deployment of new radio access technology offers the possibility to optimize the existing mobile backhaul. Both the new technology (5G, LTE-A) and the legacy systems (LTE, HSPA, 3G, 2G) utilize the transmission and transport ... -
Reliability and Availability Modelling of Telecommunication Servers on Cloud
(2015-07-09)Reliability and availability considerations are discussed in this paper with special focus on ‘cloud based’ Mobile Switching and Application Servers (MSS and AS). Before the extensive deployment of cloud based telecom ... -
Microwave Harmonic Generation in Fiber-Optical Links
(2000-05-22)Optical transmission of microwave (MW) and millimeter-wave (MMW) signals have become an intensive research area in the last decade. There is a growing interest in optical processing of MW signals [1, 2], phased array ... -
Fixed MW Access Network Design Using Interference Matrices
(2003-09-10)Density of microwave and millimeter-wave radio relay networks increased with unexpected speed in the last decade. For long time rain attenuation and thermal noise limitation were in the main focus of fixed radiolink design. ... -
Optical Upconversion of 100 Mb/s BPSK Microwave Subcarrier Signals Using an Unbalanced Mach-Zehnder Interferometer
(2000-09-11)A new technique for remote upconversion of a 100 Mb/s BPSK microwave subcarrier signal is proposed and demonstrated. It is based on the insertion of an unbalanced Mach-Zehnder interferometer in a microwave fiber-optic link. -
Investigations in Microwave Optical Links - Accent on QAM
(2000-09-11)Various-depth field descriptions and their use are summarized. Effects in optical links are being investigated being of particular importance if QAM microwave signals are transmitted. In this framework modulator-induced ... -
Access-independent Cloud-based Real-Time Translation Service for Voice Calls in Mobile Networks
(2018-07-20)Nokia offers a speech translation solution for mobile networkoperators: Operators can provide real-time machine translation of speech, as a useful extension to their currently available voice service. The concept offers a ... -
Access Transmission Network Upgrade in a Nationwide Mobile Network Modernization Project for EDGE Deployment
(2008-10-02)In this paper details of a nationwide fixed access transmission network upgrade is presented with special focus on GSM network modernization for EDGE (Enhanced Data rates for GSM Evolution) deployment.
RSS 1.0