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Indoor MIMO Visible Light Communications: Novel Angle Diversity Receivers for Mobile Users
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Indoor MIMO Visible Light Communications: Novel Angle Diversity Receivers for Mobile Users

Category : LIFI

Sub Category : Wireless communication

Project Code : ITLI06

Project Abstract

This paper proposes two novel and practical designs of angle diversity receivers to achieve multiple-input-multiple output (MIMO) capacity for indoor visible light communications (VLC). Both designs are easy to construct and suitable for small mobile devices. By using light emitting diodes for both illumination and data transmission, our receiver designs consist of multiple photo detectors (PDs), which are oriented with different inclination angles to achieve high-rank MIMO channels and can be closely packed without the requirement of spatial separation. Due to the orientations of the PDs, the proposed receiver designs are named pyramid receiver (PR) and hemispheric receiver (HR). In a PR, the normal vectors of PDs are chosen the same as the normal vectors of the triangle faces of a pyramid with equilateral N-gon base. On the other hand, the idea behind HR is to evenly distribute the PDs on a hemisphere. Through analytical investigation, simulations and experiments, the channel capacity and bit-error-rate (BER) performance under various settings are presented to show that our receiver designs are practical and promising for enabling VLC-MIMO. In comparison to induced link-blocked receiver, our designs do not require any hardware adjustment at the receiver from location to location so that they can support user mobility. Besides, their channel capacities and BER performance are quite close to that of link-blocked receiver. Meanwhile, they substantially outperform spatially-separated receiver. This study reveals that using angle diversity to build VLC-MIMO system is very promising.

Existing system

Proposed System

     Ø  In the golden days, the blind people need some other help for navigation in indoor environment.

    Ø  But every often we asking the help to another is impossible.



     Ø  They need other help.

     Ø  There is no automatic system.

     Ø  Third person also make any misuse.


    Ø  Here we introduce a new technology in blind navigation system for blind people.

    Ø  LIFI technology is used to wide transmission of data without occurring of noise.


    Ø  The system automatically guide in indoor without any manual work.

   Ø  It secures blind person and reduces complexity of the person.


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