Abstract
In this article, a DC-biased optical–orthogonal frequency-division multiplexing visible light communication systems based on multi-point light-emitting diodes-array sources in the special-type vehicle is investigated. The novel lighting layout based on optical power evenly distribution principle is proposed to meet the desired lighting and communication requirement. Meanwhile, in order to resist the inter-symbol interference caused by multipath dispersion, DC-biased optical–orthogonal frequency-division multiplexing modulation strategy is suggested. The performance parameters of signal-to-noise ratio, the root-mean-square delay spread, and maximum transmission rate have been analyzed and calculated theoretically based on direct and multipath reflected channel models of visible light communication. The validity of the visible light communication system is demonstrated by simulation experiments results as follows: the received optical power range of −0.73 to 0.56 dBm in vehicle for approximately 2 m × 2 m × 1.5 m cube space, uniform illumination rate is 80.5%, average signal-to-noise ratio is 20.92 dB. Moreover, the maximum data rate can be improved from 107.8 to 477.4 Mb/s with the bit error rate at approximately 10−5, which meet the illumination and data transmission rate requirement for the special-type vehicle.
Highlights
With the rapid development and improvements in lightemitting diode (LED) technologies, LEDs are expected to replace conventional incandescent and fluorescent lamps in the near future due to their lower cost, higher lifetime, and lower power consumption
We introduce a term called signal-to-noise plus distortion ratio (SNDR).[18]
It can be seen that the mean value of signal-to-noise ratio (SNR) in the case of reflection of the inner wall of the vehicle is 63.5% lower than the line of sight (LOS) link, which indicates that the inter-symbol interference (ISI) caused by multipath propagation in the vehicle affects the system communication performance when the system code rate is 100 Mbps
Summary
With the rapid development and improvements in lightemitting diode (LED) technologies, LEDs are expected to replace conventional incandescent and fluorescent lamps in the near future due to their lower cost, higher lifetime, and lower power consumption. At this time, the standard deviation of the received optical power is 20.982 dBm. The direct light power distribution at the optimal position is shown in Figure 5(a) with the maximum value of 20.1014 dBm, the minimum value of 21.5061 dBm, and the average value of 20.5541 dBm. Figure 5(b) shows the distribution of the optical power under the direct reflection plus the first reflection link with the maximum value of 0.5576 dBm, the minimum value of 20.7317 dBm, and the average value of 0.207 dBm. It is clear that the optical power distribution has increased when considering the reflection in vehicle. The bit error rate (BER) of the subcarrier in MQAM modulation is given as rffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi!
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