Abstract
Optical mobile communication (OMC) is a recently proposed optical wireless communication concept aiming to provide very high‐speed data rate optical wireless links for multiple and, in general, distributed mobile users. Previous work analyzed the rate performance of a two‐user OMC system without user mobility. This paper extends the rate analysis to multiple users with mobility. The scenario of employing multiple light sources with possible user grouping is also considered. User mobility and multiple light sources lead to new challenges on the system design which are addressed for broadcast downlink communication in this work. Simulations show that user mobility decreases the rate, and the way of how to utilize multiple light sources has great impact on the performance. In particular, simultaneous power division usage of multiple light sources through user grouping and power allocation brings almost no gain as compared with the case of single light source. On the other hand, time division usage of multiple light sources is capable of compensating for the hardware deficiency and thus increasing the rate greatly. It is found that OMC is not only superior to the conventional scheme with nonadjustable channel gains but also outperforms free space optical scheme at high signal‐to‐noise ratio region.
Highlights
Increasing the network throughput for diverse applications is always one of the main objectives of mobile communication systems
(1) The first benchmark scheme can split and steer the beam but with fixed power allocation ratios for different users; its effective channel gains are nonadjustable as compared with Optical mobile communication (OMC)
The purpose is to evaluate the gain brought by adaptive power allocation according to users’ speeds in OMC
Summary
Increasing the network throughput for diverse applications is always one of the main objectives of mobile communication systems. In the fifth-generation (5G) mobile communication system [1], the data rate can be boosted by three ways in the physical layer. New spectrum with higher frequency, i.e., the millimeter wave band, is allocated to provide high-speed data rate links [2, 3]. Spatial multiplexing gain or the multiuser diversity gain is exploited, with massive multiple input multiple output (MIMO) or small cells to provide manyfold increase in data rate compared to conventional techniques with few antennas or large cells [4, 5]. An important view is that 6G will exploit full spectrum, spanning from radio frequency and millimeter wave to terahertz, visible light, and even higher frequency bands, to support full coverage communications ranging from terrestrial to ocean surface, air, and even space.
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