**3. Conclusion**

For fair comparison, the whole emitted optical power of the both emission patterns are normalized to 1 W. The main parameters for the following simulation are included in the **Table 1**. In this Lambertian pattern case, the mobile patient experiences up to 5.77 dB channel gain variation, specifically ranging from 58.71 to 52.94 dB, as shown in **Figure 3a**. Thanks to the intrinsic spatial emission characteristics of the concerned non-Lambertian pattern, the channel gain ranges from 57.79 to 55.26 dB with variation reduced to 2.53 dB. Accordingly, the performance uniformity brought by the pattern replacement could been observed by the

*Moving Broadband Mobile Communications Forward - Intelligent Technologies for 5G…*

**Parameters Value** Length of room 4 [m] Width of room 3 [m] Height of room 2.5 [m] Height of optical receiver 2.5 [m] Height of optical transmitter 1.8 [m] Detection area of receiver 1 cm<sup>2</sup> Field of view 85°

probability distribution function (PDF) in **Figure 3b** as well.

*Optical channel gain comparison in (a) spatial distribution and (b) PDF statistics.*

**Table 1.**

**Figure 3.**

**130**

*Parameters for simulation.*

The high bandwidth, abundant spectrum resources and high confidentiality of wireless optical communication are suitable for 5G and B5G communication systems. With the rapid development of OWC technology, discussions on different beam characteristics and active research will be unprecedentedly released. In this study, the potential channel gain induced by the non-Lambertian beam is investigated in typical healthcare scenario. The results show that the channel gain fluctuation could be reduced up to about 3.24 dB, with constant transmitted optical power.
