Design of an Omnidirectional Multibeam Transmitter for High-Speed Indoor Wireless Communications

Abstract

For future high speed indoor wireless communication, diffuse wireless optical communications offer more robust optical links against shadowing than line-of-sight links. However, their performance may be degraded by multipath dispersion arising from surface reflections. We have developed a multipath diffusive propagation model capable of providing channel impulse responses data. It is aimed to design and simulate any multibeam transmitter under a variety of indoor environments. In this paper, a multi-beam transmitter system associated with hemisphere structure is proposed to fight against the diverse effects of multipath distortion albeit, at the cost of increased laser power and cost. Simulation results of multiple impulse responses showed that this type of multi-beam transmitter can significantly improve the performance of BER suitable for high bit rate application. We present the performance and simulation results for both line-of-sight and diffuse link configurations. We propose a design of power radiation pattern for a transmitter in achieving uniform and full coverage of power distributions for diffuse indoor optical wireless systems.

Performance Analysis of Indoor Diffuse VLC MIMO Channels Using Angular Diversity Detectors

“…In [8] results from several indoor OWC MIMO experiments were reported, a four channel MIMO system that uses white LEDs for communications was described as well as experiments in a diffuse environment using infra-red sources. An omnidirectional multibeam transmitter in [9] was proposed to improve transmission coverage and overcome shadowing, in this paper a multibeam hemispherical receiver structure was found to reduce multipath effects. The simulation results showed significant reduction of the BER making the system suitable for high bit rate applications.…”

Study, analysis and application of optical OFDM, single carrier (SC) and MIMO in intensity modulation direct detection (IM/DD)

“…In[94] results from several indoor OWC MIMO experiments were reported, a four channel MIMO system that uses white LEDs for communications was described as well as experiments in a diffuse environment using infra-red sources. An omnidirectional multibeam transmitter in[92] was proposed to improve transmission coverage and overcome shadowing, in this paper a multibeam hemispherical receiver structure was found to reduce multipath effects. The simulation results showed a significant reduction of the BER making the system suitable for high bit rate applications.…”