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

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)
Istanbul, Turkey
Aug. 2011

invited paper



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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