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Projects / Programmes source: ARIS

Rf signal prediction for indoor and outdoor environment for mobile radio links and broadcasting

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Research activity

Code Science Field Subfield
2.08.00  Engineering sciences and technologies  Telecommunications   

Code Science Field
T180  Technological sciences  Telecommunication engineering 
T191  Technological sciences  High frequency technology, microwaves 
Keywords
mobile communications, fading, signal distortion, reverberation chamber, digital broadband signals, CDMA, packet transmission, optical transmission and generation of RF signals, millimetre-wave signals
Evaluation (rules)
source: COBISS
Evaluation of bibliographic research performance indicators according to ARIS methodology
Citations Citations for bibliographic records in COBIB.SI that are linked to records in citation databases
source: WoS source: Scopus source: COBISS
Researchers (2)
no. Code Name and surname Research area Role Period No. of publications
1.  15619  MSc Radovan Pajntar  Telecommunications  Researcher  1998 - 1999  21 
2.  05967  PhD Matjaž Vidmar  Telecommunications  Head  1998 - 1999  570 
Organisations (1)
no. Code Research organisation City Registration number No. of publications
1.  1538  University of Ljubljana, Faculty of Electrical Engineering  Ljubljana  1626965  27,763 
Abstract
We have studied various issues with regard to the system and technological aspects of mobile communications, with emphasis on fading and signal distortion. Until now, research was focused mainly on signal attenuation. With the introduction of the digital and particularly broadband transmission at high bit rates signal modulation distortion became major concern. In conjunction with fading and signal strength it determines the performance of two-way and one-way mobile links. We performed signal fading and distortion simulation in the reverberation chamber which was particularly built for this purpose. In the case the reverberation chamber is properly designed it enables a realistic simulation of the mobile radio channel with Rayleigh and Rice fading statistics. We have built special measurement equipment which gives us the possibility of measuring fading statistics histogram, diversity reception gain, influence of fading and signal distortion on bit error rate in digital links, and studying the fading in CDMA systems. We have also studied a very promising method of wireless distribution of broadband signals to the end user. This method of optical generation and transmission of mm-wave RF signals has been lately of great interest because it is the only one that enables the construction of wireless broadband access network. Theoretical investigations have been conducted with regard to various methods of optical generation of RF signals, quality and performance of such signals in conjunction with different modulation formats. We have also investigated various limiting factors that occur in optical generation and at the transport site as well as in the final radio drop.
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