Smart antennas promise to provide range extension and capacity enhancements crucial to the successful deployment of Universal Mobile Telecommunications System (UMTS) networks. The frequency offset between the uplink and downlink in the Frequency Division Duplex (FDD) air interface gives rise to a frequency dependency in the channel responses and potential problems in downlink beamforming. In order to investigate this, a highly novel dual-band, dualpolarised channel sounding trial was performed in the UMTS FDD bands by the University of Bristol. The wideband measurements were conducted in the City of
Bristol, encompassing urban city and sub-urban residential scenarios and subsequent post processing was performed to extract channel parameters across the two bands. This paper presents the results and analysis done so far. It was observed that there was generally a higher degree
of scattering in the higher frequency band, resulting in larger angular spreads and delay spreads in most locations. The channels also exhibited a strong degree
of de-correlation when viewed from the spatial and temporal domains
Additional information: A paper presented to the 3rd Management Committee Meeting of COST 273 : Towards Mobile Broadband Multimedia Networks, held in Guildford, UK, October 17-18, 2002
Sponsorship: The authors gratefully acknowledge financial support of HEFCE for the procurement of the Medav RUSK system under JREI ’98, Allgon Systems AB for loan of the UMTS array, Philip Mattos of ST Electronics for the GPS receiver. In addition, we are grateful to the Overseas Research Studentship (ORS) and the University of Bristol for their financial support of S.E.
Contributor: European Cooperation in the Field of Scientific and Technical Research (EURO-COST)