Abstract
In current optical wireless communications (OWC) oriented research works, the various multiple input multiple output (MIMO) techniques are introduced and utilized to enhance the coverage performance. Objectively, this Lambertian light beam based MIMO research paradigm neglects the light beam diversity and the potential performance gains. In this work, the distinct non-Lambertian light beams of commercially available light emitting diodes (LEDs) were adopted to configure MIMO OWC links. Specifically, the homogenous and heterogeneous non-Lambertian MIMO configurations were constituted in typical indoor scenarios. Moreover, applying the repetition coding (RC) MIMO algorithm with low complexity, a spatial coverage performance comparison was made between the several above mentioned non-Lambertian configurations and the well-discussed Lambertian MIMO configuration. Numerical results illustrate that the homogeneous NSPW light beam configuration could provide a more than 30 dB average signal to noise ratio (SNR), while the achievable average SNR of the heterogeneous light beam configuration was up to 28.77 dB. On the other side, the counterpart of the Lambertian configuration achieved just about 27.00 dB. Objectively, this work paves the fundamental and essential way for the further design and optimization of MIMO OWC in this novel light beam dimension.
Highlights
As one vital enabling technology of generation mobile networks, i.e., beyond 5G or 6G, optical wireless communication (OWC) is earning overwhelming discussion from the academic and research communities [1,2,3,4,5]
OWC could reuse ubiquitous illumination infrastructure, the original coverage performance of OWC was severely limited by the spatial beam characteristics of light emitting diodes (LED), which is the key component of OWC transmitters [1,2,3,4]
It must be noted that the current multiple input multiple output (MIMO) OWC research paradigm usually assumes that the LED sources follow well-discussed Lambertian radiation patterns with quite low complexity
Summary
As one vital enabling technology of generation mobile networks, i.e., beyond 5G or 6G, optical wireless communication (OWC) is earning overwhelming discussion from the academic and research communities [1,2,3,4,5]. It must be noted that the current MIMO OWC research paradigm usually assumes that the LED sources follow well-discussed Lambertian radiation patterns with quite low complexity. Some pioneering works have elementarily identified the significant single input single output (SISO) channel characteristics induced by actual non-Lambertian light beams [15,16,17,18]. In the following reported work, motivated by the above analysis, the distinct nonLambertian light beams were further explored in repetition coding (RC) MIMO OWC transmitter configurations. The non-Lambertian light beam based homogeneous and heterogeneous MIMO OWC configurations were proposed, and the relevant indoor coverage performance was modeled and estimated in typical indoor scenarios. It should be noted that, in this work, all concerned non-Lambertian beam characteristics were based on the prestigious and fundamental modeling work for representative and distinct actual LED beams of. The expected sufficient generalization could be satisfied through the whole following reported work
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