Institute for Communication Technologies and Embedded Systems

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.

Copyright © by IEEE
© 2024 IEEE.Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.