Experimental Demonstration of HighOrder Modulation for Optical Camera
- Slides: 22
Experimental Demonstration of High-Order Modulation for Optical Camera Communication University of Science and Technology of China, Hefei Wei Huang, Peng Tian, Chen Gong, Zhengyuan Xu 2015 -12 -12
Outline • Background of this research • Higher-order modulation for OCC • The CDF-based receiver • Experimental results and discussion • Conclusions
Outline • Background of this research • Higher-order modulation for OCC • The CDF-based receiver • Experimental results and discussion • Conclusions
Background of OCC Fig 1. The system diagram of optical camera communication
Background of OCC How to Satisfy it?
Outline • Background of this research • Higher-order modulation for OCC • Experimental results and discussion • Conclusions
High-order Modulation for OCC with
The CDF-based Receiver The training level
The Mean Grey-based Receiver For the detection based on the mean grey level, the detection metric is given by
Outline • Background of this research • Higher-order modulation for OCC • Experimental results and discussion • Conclusions
Experimental Platform for OCC Programmable RGB-LED array PC-Demodulator OCC Receiver based on FPGA Fig 2:The actual experiment setting for high order modulation in OCC.
Experimental Setting for OCC • The image sensor key specifications Manufacture process CMOS Output formats 10 bits RAW Pixel size 2 um*2 um Frame Rate 330 fps Lens size 1/3 inch Semi-angle at half power of LED 12. 5 o Resolution 672*380 Communication distance 50 cm~300 cm (without lens) • The packet format in OCC
Nonideality in Actual OCC System Fig 3. The received flicker noise due to fluorescent lamp.
Flicker Noise Fig 4. The received flicker noise due to fluorescent lamp.
Nonlinear Between Tx-Rx Fig 5. The nonlinearity in OCC.
CDF for 4 PAM Modulation
BER vs Different Modulation Depths Fig 8. The BER performance for different modulation depths.
BER vs Different ROI Size Fig 9. The BER performance for different ROI sizes (TR distance 100 cm, modulation depth 0. 0495)
BER vs Different TR Distances
Outline • Background of this research • Higher-order modulation for OCC • Experimental results and discussion • Conclusions
Conclusions Ø Higher-order modulation is possible in OCC; Ø Optimal modulation level allocation is needed for actual OCC system; Ø More advanced signal demodulation algorithm is need for actual OCC system; Ø The BER performance and transmission distance can be improved by lens sequence and tracking systems.
Thank you (Q&A)
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