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BER measurement--- Screen OFDMTrang Nguyen
June 2018
Experiment setup 1 – Straight LoS
8cm×8cm (16×16 A-QL) Tx
• Distance: 1.5m• Distance: 3m• Distance: 4.5m
84×84 (Screen OFDM) Tx
Same 5-pixel/ Tx cell
For a fair evaluation!
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Experiment result 1
1.5m –0 perspective degree
3m --0 perspective degree
4.5m --0 perspective degree
Bits received 1495368 1578960 1671840
error 1 49317 2540 8486
error 2 359 399 280
error 3 - - -
Experiment results 1
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Experiment results 1
Experiment setup 2 – 30-degree Perspective LoS
• Distance: 1.5m• Distance: 3m• Distance: 4.5m
8cm×8cm (16×16 A-QL) Tx
84×84 (Screen OFDM) Tx
Same 5-pixel/ Tx cell
For a fair evaluation!
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Experiment result 2
1.5m --30 degree 3m --30 degree 4.5m --30 degree
Bits received 873072 1356048 705888
error 1 253517 56267 42245
error 2 71466 875 3473
error 3 - - -
Experiment results 2
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Experiment results 2
Experiment setup 3 – 60-degree Perspective LoS
• Distance: 1.5m• Distance: 3m• Distance: 4.5m
8cm×8cm (16×16 A-QL) Tx
84×84 (Screen OFDM) Tx
Same 5-pixel/ Tx cell
For a fair evaluation!
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Experiment result 3
1.5m --60 degree 3m --60 degree 4.5m --60 degree
Bits received 668736 566568 752328
error 1 151082 144264 139067
error 2 36871 35378 24219
error 3 - - -
Experiment results 3
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Experiment results 3
BER measurement scenario 1
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1.5m distance
1.5m distance
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3m distance
3m distance
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4.5m distance
4.5m distance
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BER measurement scenario 230-degree Perspective
1.5m distance
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1.5m distance
3m distance
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3m distance
4.5m distance
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4.5m distance
BER measurement scenario 360-degree Perspective
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1.5m distance
1.5m distance
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3m distance
3m distance
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4.5m distance
4.5m distance
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Performance Summary
0-degree 30-degree
60-degree
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Performance Comparison
Comparison –Scenario 1
A-QL Screen OFDM
Screen OFDM brings much better BER performance when the distance increasing. Screen OFDM performance is more stable vs distance.
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Comparison –Scenario 2
A-QL Screen OFDM
Screen OFDM brings better BER performance when the distance increasing. In contrast, at short distance (1.5m), A-QL can take its advantage. The reason is related to the Cosine-forth law.
Comparison –Scenario 3
A-QL Screen OFDM
Screen OFDM is more stable with the perspective distortion such as 60-degree viewing.Also, it can perform better at far distance.
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Conclusion
BER of Screen-OFDM has been measured. The impacts of distance and viewing angle to BER are
tested.
▪ Screen-OFDM significantly outperformed A-QL in terms of BER performance for a greater
communication distance and wider perspective view.
▪ For BER 10-5 requirement, Screen-OFDM works reliably as far as 4.5m distance with wider
perspective angle (> 30 degree) in compared to A-QL.
▪ If the same cell-size is applied, OFDM brings better performance in compared to A-QL. The bilinear
channel equalizer is used.
Remind Theoretical Aspects
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Technical Contributions
Theoretically analyze the impacts of channel imperfection
Cosine-Fourth Law Blurry Image Impact Temporal and Spatial
sampling error
Nonlinear channel response Pixel Eb/No Clipping Noise
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Technical Contributions
Impact of the Cosine-Fourth Law
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The received illuminance ratio
The attenuation function H The inter-carrier interference I
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Technical Contributions
Practically analyze the impacts of channel imperfection
On-focus condition Blurry condition
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Video – Experimental Channel Analysis
Good-focus condition
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Video – Experimental Channel Analysis
Blurry condition
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Annex:Requirement for
final BER goal 10-5
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Reed Solomon Coding
• Input BER between (10-3 and 10-4) can produce the desired BER at 10-5
Desired BER Input
Convolutional Coding CC(1/4)
Desired BER (raw)
• Raw BER between (10-2 and 10-3) can produce the desired BER at CC layer, corresponding to the final
BER at 10-5
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Convolutional Coding CC(1/3)
Desired BER (raw)
• Raw BER between (10-2 and 10-3) can produce the desired BER at CC layer, corresponding to the final
BER at 10-5
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