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Analysis of Mismatched Downlink Beamforming over Non-Stationary Channels with Interference

Authors:: Ispas, A. , Schneider, C. , Dartmann, G. , Gong, X. , Ascheid, G. , Thomä, R.
Book Title:: Proc. XXX General Assembly Scientific Symp. Int. Union Radio Science (URSI)
Address:: Istanbul, Turkey
Date:: Aug. 2011
Note:: invited paper
DOI:: 10.1109/URSIGASS.2011.6050576
Language:: English
Abstract:: Inter-cell interference is the limiting factor in next generation cellular networks with frequency reuse factor 1. A promising approach to mitigate the effects of downlink interference is the use of transmit beamforming; however, only few measurement-based performance evaluations are currently available to assess realistic gains and limitations. We study the achievable performance of inter-cell interference-limited networks with single-user detection for slow and fast fading channels that are non-stationary but doubly underspread. The evaluation is based on channel measurements at 2.53 GHz in an urban macrocell scenario. Different beamforming techniques, a non-cooperative and two cooperative ones, are used and their robustness to the non-stationarity of the channel is evaluated. The cooperative techniques are found to be much less robust to the non-stationarity of the channel. Furthermore, an approximation of the mutual information is evaluated; it is more accurate for the cooperative techniques.
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