Experimental Demonstration of HighOrder Modulation for Optical Camera

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Experimental Demonstration of High-Order Modulation for Optical Camera Communication University of Science and Technology

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

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

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 Fig 1. The system diagram of optical camera communication

Background of OCC How to Satisfy it?

Background of OCC How to Satisfy it?

Outline • Background of this research • Higher-order modulation for OCC • Experimental results

Outline • Background of this research • Higher-order modulation for OCC • Experimental results and discussion • Conclusions

High-order Modulation for OCC with

High-order Modulation for OCC with

The CDF-based Receiver The training level

The CDF-based Receiver The training level

The Mean Grey-based Receiver For the detection based on the mean grey level, the

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

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

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

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

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.

Flicker Noise Fig 4. The received flicker noise due to fluorescent lamp.

Nonlinear Between Tx-Rx Fig 5. The nonlinearity in OCC.

Nonlinear Between Tx-Rx Fig 5. The nonlinearity in OCC.

CDF for 4 PAM Modulation

CDF for 4 PAM Modulation

BER vs Different Modulation Depths Fig 8. The BER performance for different modulation depths.

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

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

BER vs Different TR Distances

Outline • Background of this research • Higher-order modulation for OCC • Experimental results

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

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)

Thank you (Q&A)