Graduate School and Research Center in Digital Sciences

Experimental evaluation of relative calibration in a MISO-TDD system

Magounaki, Theoni; Kaltenberger, Florian; Jiang, Xiwen; Buey, Cyril; Ratajczak, Philippe; Ferrero, Fabien

EUCNC 2017, European Conference on Networks and Communications, June 12-15, 2017, Oulu, Finland

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.

Document Doi Hal Bibtex

Title:Experimental evaluation of relative calibration in a MISO-TDD system
Department:Communication systems
Eurecom ref:5260
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Bibtex: @inproceedings{EURECOM+5260, doi = {}, year = {2017}, title = {{E}xperimental evaluation of relative calibration in a {MISO}-{TDD} system}, author = {{M}agounaki, {T}heoni and {K}altenberger, {F}lorian and {J}iang, {X}iwen and {B}uey, {C}yril and {R}atajczak, {P}hilippe and {F}errero, {F}abien}, booktitle = {{EUCNC} 2017, {E}uropean {C}onference on {N}etworks and {C}ommunications, {J}une 12-15, 2017, {O}ulu, {F}inland}, address = {{O}ulu, {FINLAND}}, month = {06}, url = {} }
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