scholarly journals Adaptive real-time software defined MIMO visible light communications using spatial multiplexing and spatial diversity

2016 ◽  
Author(s):  
Peng Deng ◽  
Mohsen Kavehrad
Keyword(s):  
Visible Light ◽  
Real Time ◽  
Spatial Diversity ◽  
Spatial Multiplexing ◽  
Visible Light Communications

Optimal Power Allocation in SM-OFDM System Based on Visible Light Communications

2014 ◽  
Vol 513-517 ◽  
pp. 3429-3433
Author(s):  
Hong Shuang Fu ◽  
Yi Jun Zhu ◽  
Wen Bing Cai
Keyword(s):  
Visible Light ◽  
Power Allocation ◽  
Optimal Allocation ◽  
Symbol Error Rate ◽  
Spatial Multiplexing ◽  
Spatial Modulation ◽  
Visible Light Communications ◽  
Ofdm System ◽  
Optimal Power ◽  
Data Rates

Spatial Modulation is a kind of spatial multiplexing schemes conveying information by the location of transmit antennas and spatial modulation (SM) along with OFDM can be applied to visible light communications for higher data rates. The closed form of symbol error rate (SER) in optical SM-OFDM communication system is derived in this paper. SER is a convex function of power allocation coefficients, therefore there exist optimal allocation coefficients minimizing SER. The optimal allocation coefficients are derived for different channels and numbers of transmit antennas. Analytical results are validated by Monte Carlo simulation results and these results show that a significant SER improvement is obtained by using the power allocation. In addition, the optimal allocation coefficients are affected by the channel and number of transmitters.

scholarly journals A Real-time Vehicular Visible Light Communications for Smart Transportation

2020 ◽  
Author(s):  
Karunankitha Lega ◽  
Sai Naga Haneesh Sammeta ◽  
Divya Bollepally ◽  
Guru Kalyan Mallavarapu ◽  
Elizabeth Eso ◽  
...  
Keyword(s):  
Visible Light ◽  
Real Time ◽  
Visible Light Communications ◽  
Smart Transportation

scholarly journals Visible light communications: real time 10 Mb/s link with a low bandwidth polymer light-emitting diode

2014 ◽  
Vol 22 (3) ◽  
pp. 2830 ◽  
Author(s):  
Paul Anthony Haigh ◽  
Francesco Bausi ◽  
Zabih Ghassemlooy ◽  
Ioannis Papakonstantinou ◽  
Hoa Le Minh ◽  
...  
Keyword(s):  
Visible Light ◽  
Real Time ◽  
Light Emitting Diode ◽  
Visible Light Communications ◽  
Light Emitting ◽  
Polymer Light Emitting Diode

scholarly journals Optical Filter-Less WDM for Visible Light Communications Using Defocused MIMO

Electronics ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 1065
Author(s):  
Andrew Burton ◽  
Petr Chvojka ◽  
Paul Anthony Haigh ◽  
Zabih Ghassemlooy ◽  
Stanislav Zvanovec
Keyword(s):  
Visible Light ◽  
Wavelength Division Multiplexing ◽  
Light Emitting Diode ◽  
Multiple Input Multiple Output ◽  
Optical Filter ◽  
Spatial Diversity ◽  
Visible Light Communications ◽  
Light Emitting ◽  
Photodetector Array ◽  
The Individual

This paper experimentally investigates, for the first time, a new wavelength-division multiplexing-based visible light communications link based on a defocused non-imaging multiple-input multiple-output (MIMO), which removes the need for tuned optical bandpass filters paired with each receiver. The proposed system is based on using the natural diversity of the individual light emitting diodes (LEDs) within a single light source to generate an H-matrix, which is independent of spatial diversity. We show that, by transmitting K-independent sets of non-return to zero on-and-off keying signals on separate wavelengths, the received superposed symbols can be demultiplexed. The non-imaging MIMO diversity is achieved by considering the power-current characteristics of the light emitting diode, the responsivity of the photodetector array, and the defocused beam spot. The system is empirically verified for K = 3 using red, green, and blue LEDs with Q-factors of 7.66, 7.69, and 4.75 dB, respectively.

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