Fig. 1. Encoding process and selection of correction bit
Fig. 2. Selection process of amendent bit
Fig. 3. System architecture model
Fig. 4. VLC system channel model
Fig. 5. Performance comparison of PAPR. (a) n=256, N=64; (b) n=1024, N=256
Fig. 6. Simulation of error performance. (a) n=256, N=64; (b) n=1024, N=256
Fig. 7. Comparison of PAPR inhibition performance of each scheme
Fig. 8. BLER performance of each scheme
Experimental parameter | Value |
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Half power point half angle | 40 | Lambertian emission seriesm m | 1.5684 | LED transmit power /W | 12 | Optical filter gain | 1 | Lens refractive index | 1.5 | Receiving field of view | 70 | Indoor space size /(m×m×m) | 5×5×3 | Vertical distance between light source and receiving plane /m | 2.15 |
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Table 1. Channel simulation experiment parameters
Parameter | Ordinary OFDM | Pro a=8, best | Pro a=8, worse | Pro a=32, best | Pro a=32, worse |
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Code length | 256 or 1024 |
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Number of correction bits | N/A | 8 | 8 | 32 | 32 | Quality of and sub-channel | N/A | Best | Worse | Best | Worse |
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Table 2. Simulation experiment parameters of PAPR performance under different code lengths
Group | Ordinary OFDM | Pro a=8, best | Pro a=8, worst | Pro a=32, best | Pro a=32, worst |
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Code length | 256 or 1024 | Bit rate | 128/256 and 512/1024 | (128+8)/256 and (512+8)/1024 | (128+8)/256 and (512+8)/1024 | (128+32)/256 and (512+5)/1024 | (128+32)/256 and (512+32)/1024 |
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Table 3. Simulation experiment parameters of error performance
Scheme name | Code length | Code rate | Number of candidate signals |
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Pro PC-OFDM | 512 | 1/2 | a=32 | a=16 | a=8 | PC-SLM 1 | 512 | 1/2 | q=32 | q=16 | q=8 | PC-SLM 2 | 512 | 1/2 | q=32 | q=16 | q=8 | Ordinary-OFDM | 512 | 1/2 | N/A | N/A | N/A |
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Table 4. Simulation experiment parameters for PAPR performance comparison of different schemes
Scheme name | Code length | Code rate | Number of candidate signals |
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Pro PC-OFDM | 512 | 1/4, 1/2, 3/4 | a=16 | PC-SLM 1 | 512 | 1/4, 1/2, 3/4 | q=16 | PC-SLM 2 | 512 | 1/4, 1/2, 3/4 | q=16 | Ordinary-OFDM | 512 | 1/4, 1/2, 3/4 | N/A |
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Table 5. Simulation experiment parameters for BELR performance of each scheme