Title :
Performance of downlink nulling for combined packet/circuit switched systems
Author :
Hugl, Klaus ; Bonek, Ernst
Author_Institution :
Inst. fur Nachrichtentech. und Hochfrequenztech., Tech. Univ. Wien, Austria
Abstract :
In the evolution of 2nd generation mobile communication systems packet switched data transmission (e.g. GPRS/EGPRS in GSM Phase 2+) and circuit switched speech communication will be demanded in parallel. Directing nulls of the antenna pattern to active mobiles in the downlink beamforming process using antenna arrays at the base station may be useless in the case of packet data transmission. We show that even in combined packet/circuit switched mobile communication systems “gentle” downlink interferer nulling dependent on propagation conditions and traffic distribution leads to performance and capacity improvements
Keywords :
adaptive antenna arrays; array signal processing; cellular radio; channel capacity; circuit switching; interference suppression; packet radio networks; radio links; radiofrequency interference; telecommunication traffic; GPRS/EGPRS; GSM Phase 2+; active mobiles; adaptive base station antennas; antenna arrays; antenna pattern; base station; capacity improvement; circuit switched speech communication; combined packet/circuit switched systems; downlink beamforming; downlink interference suppression; downlink interferer nulling; multipath propagation; packet switched data transmission; performance improvement; propagation conditions; second generation mobile communication systems; simulation; traffic distribution; Antennas and propagation; Communication switching; Data communication; Downlink; Ground penetrating radar; Mobile antennas; Mobile communication; Packet switching; Switching circuits; Transmitting antennas;
Conference_Titel :
Vehicular Technology Conference, 2000. IEEE-VTS Fall VTC 2000. 52nd
Conference_Location :
Boston, MA
Print_ISBN :
0-7803-6507-0
DOI :
10.1109/VETECF.2000.886634
