Browsing by Author "Hellwig, P."

Filter results by typing the first few letters
Now showing 1 - 3 of 3
  • Placeholder
    Conference paperPublicationMetadata only
    Channel measurements and ray tracing simulations for MIMO light communication at 200 MHz
    (IEEE, 2020-09) Eldeeb, Hossıen Badr; Uysal, Murat; Mana, S. M.; Hellwig, P.; Hilt, J.; Jungnickel, V.; Electrical & Electronics Engineering; UYSAL, Murat; ELDEEB, Hossien Badr Hossien
    In this paper, we investigate 2 × 2 MIMO light communication channels using non-sequential ray tracing simulations, and measurements over 200 MHz bandwidth using a MIMO channel sounder. Results indicate good agreement between simulations and measurements validating the accuracy of ray-tracing.
  • Placeholder
    Conference paperPublicationMetadata only
    Channel modelling for light communications: Validation of ray tracing by measurements
    (IEEE, 2020) Eldeeb, Hossıen Badr; Uysal, Murat; Mana, S. M.; Hellwig, P.; Hilt, J.; Jungnickel, V.; Electrical & Electronics Engineering; ELDEEB, Hossien Badr Hossien; UYSAL, Murat
    Light communications, also denoted as LiFi, is promising for future wireless indoor networks. For performance evaluation, the IEEE P802.15.13 and P802.11bb standardization groups agreed upon channel models based on non-sequential ray tracing. In this paper, we validate the modeling approach behind by means of measurements. The same indoor scenarios, where measurements took place in 200 MHz bandwidth, have been modeled in 3D and applying ray tracing. We show that the mean-square error between simulation and measurement is below 2%. Finally, we investigate important channel parameters like path loss and coherence bandwidth as a function of distance with and without line-of-sight.
  • Placeholder
    Conference paperPublicationMetadata only
    Distributed MIMO for Li-Fi: Channel measurements, ray tracing and throughput analysis
    (IEEE, 2021-08-15) Eldeeb, Hossıen Badr; Mana, S. M.; Jungnickel, V.; Hellwig, P.; Hilt, J.; Uysal, Murat; Electrical & Electronics Engineering; ELDEEB, Hossien Badr Hossien; UYSAL, Murat
    LiFi has been considered as a promising candidate for future wireless indoor networks. The IEEE P802.15.13 and P802.11bb standardization groups agreed upon channel models generated using the non-sequential ray tracing approach of OpticStudio. In this paper, in order to validate the channel modelling approach, at first 2 × 2 multiple-input multiple-output (MIMO) channel measurements are carried out over 200 MHz bandwidth using a channel sounder. The experimental scenario is also modeled in 3D by applying ray tracing. The obtained results indicate good agreement between simulations and measured channel impulse responses, from which parameters such as path loss and delay spread are derived. After validating the channel modeling approach, we investigate the singular values and the effect of user mobility onto the performance in a 4× 4 distributed multi-user MIMO scenario.