Abstract
In this paper, we present an over-the-air (OTA) performance analysis of Grassmannian signaling strategies in an orthogonal frequency-division multiplexing (OFDM) single-user multiple-input multiple-output (SU-MIMO) scenario. Specifically, we compare the Grassmannian signaling technique to the differential Alamouti scheme and a novel space-time non-coherent scheme recently proposed in the context of 5G. As a performance benchmark we include in the comparison the coherent Alamouti scheme. We study the practical impairments associated to frequency synchronization mismatches (frequency offsets), as well as the effects of time-varying channels for different spectral efficiencies. The experimental results show that non-coherent techniques are more robust to the aforementioned impairments than the coherent Alamouti approach, while Grassmannian methods are close to the differential Alamouti scheme with 2 transmit antennas.
Keywords
J. Fanjul—This work has been supported by the Ministerio de Economía y Competitividad (MINECO) of Spain under grants TEC2013-47141-C4-R (RACHEL), TEC2016-75067-C4-4-R (CARMEN) and FPI grant BES-2014-069786. The software tools to control the USRP devices in this work have been provided by the GTEC Group, University of A Coruña, Spain.
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Notes
- 1.
The (complex) dimension of the Grassmann manifold \(\mathbb {G}\left( T,M\right) \) is \({\text {dim}}\left( \mathbb {G}\left( T,M\right) \right) = M\left( T-M\right) \), and therefore the multiplexing gain or pre-log factor of the system is \( M \left( 1-M/T\right) \).
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Fanjul, J., Ibáñez, J., Santamaria, I., Loucera, C. (2017). Experimental Evaluation of Non-coherent MIMO Grassmannian Signaling Schemes. In: Puliafito, A., Bruneo, D., Distefano, S., Longo, F. (eds) Ad-hoc, Mobile, and Wireless Networks. ADHOC-NOW 2017. Lecture Notes in Computer Science(), vol 10517. Springer, Cham. https://doi.org/10.1007/978-3-319-67910-5_18
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DOI: https://doi.org/10.1007/978-3-319-67910-5_18
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