PLC and VLC Cascade Communication System Based on CNDM-OFDM

Borui Yang; Li Zhao; Ying Lu

doi:10.3788/LOP202259.2306002

Journals >Laser & Optoelectronics Progress >Volume 59 >Issue 23 >Page 2306002 > Article

Laser & Optoelectronics Progress
Vol. 59, Issue 23, 2306002 (2022)

PLC and VLC Cascade Communication System Based on CNDM-OFDM

Borui Yang^1,2, Li Zhao^2,*, and Ying Lu³

Author Affiliations

¹Nanjing Huadun Power Information Security Evaluation Co., Ltd., Nanjing 210000, Jiangsu , China

²College of Information Science and Engineering, Xi'an Technological University, Xi'an 710003, Shaanxi , China

³China Electronics Technology Group Tai Chi Xi'an R&D Center, Xi'an 710000, Shaanxi , China

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DOI: 10.3788/LOP202259.2306002 Cite this Article Set citation alerts

Borui Yang, Li Zhao, Ying Lu. PLC and VLC Cascade Communication System Based on CNDM-OFDM[J]. Laser & Optoelectronics Progress, 2022, 59(23): 2306002 Copy Citation Text

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Fig. 1. Structure of the PLC-VLC cascade system based on CNDM-OFDM^[8]

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Fig. 2. Geometric model of the indoor PLC-VLC system

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Fig. 3. Cascade signal transmission model of PLC-VLC based on DCO-OFDM

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Fig. 4. Frame structure of multi-segment joint control signal

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Fig. 5. Training structure of the OFDM

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Fig. 6. Frequency response characteristics of PLC channel

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Fig. 7. Frequency response characteristics of VLC channel

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Fig. 8. Frequency response characteristics of PLC-VLC cascade channel

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Fig. 9. Evaluation of integrated characteristics of cascade systems. (a) Eye diagram and Q factor; (b) eye diagram and minimum BER

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Fig. 10. OFDM performance of different modulation methods

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Fig. 11. Experimental platform of the DCO-OFDM cascade communication

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Fig. 12. Waveforms of off-line modulation and reception of cascaded systems. (a) Waveform obtained by off-line modulation at the transmitter; (b) waveform received by the cascaded system

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Fig. 13. Constellation diagram of the received signal of the cascaded system

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Parameter	Value
Data subcarrier $N_{S D}$	48
Pilot subcarrier $N_{S P}$ Total number of subcarriers $N_{S T}$	4 52=48+4
Channel bandwidth /MHz	20
Subcarrier interval $Δ_{F}$ /MHz	0.315
IFFT/FFT period $T_{F F T}$ /μs	3.2=1/ $Δ_{F}$
GI duration $T_{G I}$ /μs	0.8= $T_{F F T}$ /4
Training sequence GI duration $T_{G I 2}$ /μs	1.6= $T_{F F T}$ /2
Preamble duration $T_{P r e a m b l e}$ /μs	16= $T_{S h o r t} + T_{L o n g}$
Mark space $T_{S Y M}$ /μs	1.6= $T_{F F T}$ + $T_{G I}$
Short training sequence duration $T_{S h o r t}$ /μs	8=10 $T_{F F T}$ /4
Long training sequence duration $T_{L o n g}$ /μs	8= $T_{G I 2}$ +2 $T_{F F T}$
Symbolic number of OFDM $N_{S Y M}$	64

Table 1. Frame parameters of multi-segment joint control signals

$k$	$α_{0}$	$α_{1}$	$i$	$g_{i}$	$d_{i} / m$
1	$- 2.1 \times 10^{- 3}$	$8.11 \times 10^{- 10}$	1	0.540	200.0
			2	0.275	221.0
			3	-0.150	242.0
			4	0.080	259.0
			5	-0.030	266.0
			6	-0.020	530.0

Table 2. Simulation parameters of PLC channel multipath attenuation (6-path)

Parameter	Value
Room size /（m×m×m）	4×4×3
NLOS cutoff frequency /MHz Detector physical area of PD /m²	8.5 5×10^-6
Distance between LED and PD /m	2.25
FOV of a receiver PD /（°）	60
Radiation angle of emitter LED /（°）	70
Average reflectivity of the wall	0.8
LOS channel gain /dBm	5.3×10^-4
NLOS channel gain /dBm	1.3×10^-4

Table 3. Gain simulation parameters of VLC channel

Parameter	Value
PLC-VLC system mapping mode	QPSK/BPSK/16QAM
PLC-VLC system modulation IFFT/FFT size	FFT-OFDM 64
Number of effective subcarriers	52
Number of cyclic prefixes	16
DC bias coefficient /dB	4
Clipping factor /dB	3

Table 4. Parameters for the hierarchical simulation environment of the cascaded system

Parameter	Value
LED luminous power /W	1
LED bandwidth /MHz APD effective photosensitive area φ /μm	<5 500
APD spectral response range /nm	400-1100
Plano convex lens /mm	80
Blue filter /mm	80
Power line length /m	5
Transceiver distance /cm	20