Title :
GSM base-station antenna diversity using soft decision combining on up-link and delayed-signal transmission on down-link
Author_Institution :
Danish Center for Personal Commun., Aalborg Univ.
Abstract :
Two branch base-station antenna diversity performance for the GSM (Groupe Speciale Mobile) system is simulated. For the uplink combining, soft decision signals from two SOVA data-detectors are used for a (nearly) optimum post-detection combining. For downlink, a delayed-signal (on the order of 2-b periods) is transmitted on a second antenna branch in order to introduce "artificial" time dispersion in the radio channel. This technique takes advantage of the equalizing properties of the GSM data-detector. The simulation results show that the multipath fading margin can be reduced by 6-13 dB on uplink and by 3-10 dB on downlink for the GSM specified test channels RA250 and TU50
Keywords :
antenna testing; cellular radio; delays; diversity reception; fading; land mobile radio; multipath channels; signal detection; simulation; time-varying channels; transmitting antennas; GSM base-station antenna diversity; SOVA data-detectors; delayed-signal transmission; equalizing; multipath fading margin; performance; post-detection combining; simulation; soft decision combining; test channels; time dispersion; Cities and towns; Delay effects; Detectors; Diversity reception; Fading; GSM; Mobile communication; Power generation; Testing; Transmitting antennas;
Conference_Titel :
Vehicular Technology Conference, 1993., 43rd IEEE
Conference_Location :
Secaucus, NJ
Print_ISBN :
0-7803-1267-8
DOI :
10.1109/VETEC.1993.507547
