T. Haustein, V. Venkatasubramanian, J. Eichinger, E. Schulz, T. Wirth, V. Jungnickel, A. Forck, S. Wahls, C. Juchems, F. Luhn, R. Zavrtak
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Measurements of multi-antenna gains using a 3GPP-LTE air interface in typical indoor and outdoor scenarios
In this paper we report the first real-time measurements of a 3GPP-LTE multiple antenna system in typical indoor and outdoor scenarios. In a single cell, single user scenario we demonstrate throughput exceeding 100 Mbit/s with a 2times2 MIMO configuration. This throughput gain is significant as compared to existing single antenna systems. We describe the basic LTE system design and prototype ingredients which were implemented to achieve these results. The highlight of our MIMO-OFDM system design is frequency dependent link adaptation. In principle, we show that this parallel link adaptation provides robust gains in a cellular broadband system. The robustness is seen in both our indoor and outdoor measurement results. The key feature of our work is implementation of multiple antenna concepts in such a broadband system.
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