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Experimental evaluation of relative calibration in a MISO-TDD system

Abstract : We study the transmit time reversal beamforming in a 8x1 MISO communication system at 2.68GHz. We consider the downlink time reversal transmission where a BS communicates with one user. A prototype composed by 8 antennas and designed by Orange labs acts as the BS while the user has a single antenna. The reciprocity property is destroyed by the non-symmetric characteristics of the RF electronic circuitry. We use relative calibration which is based exclusively on signal processing techniques to solve this issue. Utilizing a controlled test setup based on OpenAirInterface, the ExpressMIMO2 SDR boards, as well as a servo controlled rail, we show the feasibility of a relative calibration method through beamforming SNR measurements. We also evaluate the performance of an antenna selection scheme at the transmit side as a low-cost low-complexity alternative to capture many of the advantages of multi-antenna systems. The measurements show that the relative calibration method is performing almost optimal and that the complexity can be significantly reduced by using antenna selection.
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Contributor : Sophie Gaffé-Clément <>
Submitted on : Saturday, September 9, 2017 - 5:03:46 PM
Last modification on : Thursday, March 5, 2020 - 12:20:37 PM




T. Magounaki, F. Kaltenberger, X. Jiang, C. Buey, P. Ratajczak, et al.. Experimental evaluation of relative calibration in a MISO-TDD system. 2017 European Conference on Networks and Communications (EuCNC), Jun 2017, Oulu, Finland. pp. 1-5, ⟨10.1109/EuCNC.2017.7980759⟩. ⟨hal-01584780⟩



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