Title :
Downlink exposure reduction in dual-hop OFDM decode-and-forward relay systems
Author :
Enis Kocan;Milica Pejanovic-Djurisic;Serge Bories
Author_Institution :
University of Montenegro, Faculty of Electrical Engineering, Podgorica, Montenegro
Abstract :
Dual-hop OFDM based decode-and-forward (DF) relay system is adopted as a solution for extension of coverage area and performance improvement in LTE-Advanced systems. While the benefits of dividing the communication link between the base station (source - S) and end-user (destination - D) through implementation of relay (R) station are clear, there is still a certain public concern about the exposure to electromagnetic fields (EMF) originating from R, as it is located closer to end-users than base station. Thus, in this paper we propose implementation of multiple antennas at R station and transmit antenna selection (TAS) on subcarrier basis in downlink (DL) communication for reducing exposure from R. We have developed simulation model for the proposed system, with real-case simulation parameters given in LTE-Advanced relay reference scenario. The results obtained for the system with 3 antennas at R, show that the proposed solution provides reduction for more than 36% of the power transmitted from R, and thus reduction in EMF exposure originating from R, compared to OFDM DF relay system without TAS, while keeping the same level of ergodic capacity.
Keywords :
"Relays","OFDM","Signal to noise ratio","Transmitting antennas","Long Term Evolution","Quality of service","Mobile communication"
Conference_Titel :
Wireless Communication Systems (ISWCS), 2015 International Symposium on
Electronic_ISBN :
2154-0225
DOI :
10.1109/ISWCS.2015.7454382