NDLI: Adaptive beamforming dependencies on wideband and directional propagation characteristics in micro- and macro-cell UMTS scenarios

Content Provider	IEEE Xplore Digital Library
Author	Gil, J.M. Correia, L.M.
Copyright Year	2003
Description	Author affiliation: Inst. de Telecomunicacoes, Tech. Univ. Lisbon, Lisboa, Portugal (Gil, J.M.; Correia, L.M.)
Abstract	It is important to study the fundamental wideband and directional factors in order to establish how the channel properties affect adaptive beamforming, regarding intra-cell interference reduction. With such aim, a comparative set of micro- and macro-cell propagation scenarios is generated, allowing for the systematic analysis of the involved factors. A non-blind adaptive beamforming algorithm is applied, the conjugate gradient at the base station in the up-link makes use of the mobile terminal identifying the UMTS codes. Performance is measured through the gain in SINR relative to that obtained with a single omnidirectional antenna. The scenarios involve the variation of the grouping and angular displacement of mobile terminals, their distances to the base station, their number, and the number of array elements. It is found that the angular and temporal densities of incoming signals are the fundamental roots behind the differences in performances between macro- and micro-cells. For macro-cells, involving much larger angular densities, the effect of having common angles-of-arrival among links is much more critical than for micro-cells; in the case that terminals are grouped, beamforming gains are close to 0 dB. In such case, for micro-cells, values range from 0.9 to 9.6 dB, for 16 users, with a monotonous dependency on distance and on the number of array elements. Micro-cell environments not only allow for the application of simpler beamforming adaptive implementations, but also render larger performance increases by improving such implementations.
Sponsorship	IEEE Commun. Soc
Starting Page	688
Ending Page	692
File Size	590418
Page Count	5
File Format	PDF
ISBN	0780378229
DOI	10.1109/PIMRC.2003.1264361
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-09-07
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Array signal processing Wideband 3G mobile communication Signal to noise ratio Microwave integrated circuits Base stations Performance gain Adaptive arrays Interference Antenna measurements
Content Type	Text
Resource Type	Article

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