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Sökning: WFRF:(Kaltenberger Florian)

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1.
  • Emmelmann, Marc, et al. (författare)
  • Deliverable 6.2: Trials and experimentation (cycle 2)
  • 2020
  • Rapport (refereegranskat)abstract
    • This deliverable presents the second cycle of trials and experimentation activities executed over 5GENESIS facilities. The document is the continuation of deliverable D6.1, in the sense that it captures tests carried out over the evolved infrastructures hosting 5GENESIS facilities following the methodology defined in D6.1. In this document 8 main KPIs and 4 application specific validation trials achieved, under 123 experiments that performed in total. The tests focus more on i) the evolved 5G infrastructure deployments that includes radio and core elements in non-standalone (NSA) deployment configurations based on commercial and open implementations, and ii) the use of Open 5GENESIS Suite for the execution of the tests.
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2.
  • Jiang, Xiwen, et al. (författare)
  • MIMO-TDD Reciprocity under Hardware Imbalances: Experimental Results
  • 2015
  • Ingår i: 2015 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS (ICC). - : IEEE. - 9781467364324 ; , s. 4949-4953
  • Konferensbidrag (refereegranskat)abstract
    • For time division duplexing (TDD) systems, the physical channel in the air is reciprocal for uplink (UL) and downlink (DL) within the channel coherence time. However when the transceivers radio frequency (RF) hardware is taken into consideration, TDD channel reciprocity no longer holds because of the non-symmetric characteristics of RF transmit and receive chains. Relative calibration has been proposed to compensate this hardware impairment with a multiplicative matrix. In this paper we perform hardware measurements on this calibration matrix which gives a direct insight on the physical phenomenon of TDD transceivers. Especially, we inspect the assumption that this calibration matrix is diagonal, which is widely adopted in literature but has never been verified by experiments. This work can be regarded as an experimental base for TDD calibration or for theoretical analysis of non-perfect channel reciprocity of TDD systems.
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