Modulation Recognition of Wireless Optical Subcarrier Based on Fuzzy Clustering and Back Propagation Neural Net

Fig. 1. Clustering constellation of subcarrier MPSK signal in atmospheric turbulence channel. (a) BPSK, σχ2=0.1; (b) BPSK, σχ2=0.2; (c) QPSK, σχ2=0.1; (d) QPSK, σχ2=0.2; (e) 8PSK, σχ2=0.1; (f) 8PSK, σχ2=0.2; (g) 16PSK, σχ2=0.1; (h) 16PSK, σχ2=0.2

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Fig. 2. Hard tendency mean of fuzzy clustering corresponding to four kinds of modulation modes. (a) T2; (b) T4; (c) T8; (d) T16

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Fig. 3. Mean square error curve of improved BP neural network. (a) σχ2=0.1; (b) σχ2=0.2

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Table 1. Constellation recognition results of modulated signal when σχ2=0.1, RSN=20 dB
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Table 1. Constellation recognition results of modulated signal when σχ2=0.1, RSN=20 dB
Test Standard
$\begin{matrix} σ_{χ}^{2} \end{matrix}$ =0.1 Correct recognitionrate /% Total correctrecognition rate /%
BPSK QPSK 8PSK 16PSK
BPSK 50 0 0 0 100 100
QPSK 0 50 0 0 100
8PSK 0 0 50 0 100
16PSK 0 0 0 50 100

Table 2. Constellation recognition results of modulated signal when σχ2=0.2, RSN=20 dB
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Table 2. Constellation recognition results of modulated signal when σχ2=0.2, RSN=20 dB
Test Standard
$\begin{matrix} σ_{χ}^{2} \end{matrix}$ =0.2 Correct recognitionrate /% Total correctrecognition rate /%
BPSK QPSK 8PSK 16PSK
BPSK 50 0 0 0 100 96
QPSK 0 50 0 0 100
8PSK 0 0 48 2 96
16PSK 0 0 6 44 88

Table 3. Constellation recognition results of modulated signal when σχ2=0.25, RSN=20 dB
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Table 3. Constellation recognition results of modulated signal when σχ2=0.25, RSN=20 dB
Test Standard
$\begin{matrix} σ_{χ}^{2} \end{matrix}$ =0.25 Correct recognitionrate /% Total correctrecognition rate /%
BPSK QPSK 8PSK 16PSK
BPSK 47 2 1 0 94 87.5
QPSK 0 47 3 0 94
8PSK 0 0 45 5 90
16PSK 0 0 11 39 78

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Dan Chen, Chenhao Wang, Boyu Yao. Modulation Recognition of Wireless Optical Subcarrier Based on Fuzzy Clustering and Back Propagation Neural Net[J]. Laser & Optoelectronics Progress, 2018, 55(6): 060602

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Paper Information

Category: Fiber Optics and Optical Communications

Received: Nov. 13, 2017

Accepted: --

Published Online: Sep. 11, 2018

The Author Email: Dan Chen (chdh@xaut.edu.cn)

DOI:10.3788/LOP55.060602

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Constellation recognition results of modulated signal when σχ2=0.1, RSN=20 dB

Table 1. Constellation recognition results of modulated signal when σχ2=0.1, RSN=20 dB

Table 2. Constellation recognition results of modulated signal when σχ2=0.2, RSN=20 dB

Table 2. Constellation recognition results of modulated signal when σχ2=0.2, RSN=20 dB

Table 3. Constellation recognition results of modulated signal when σχ2=0.25, RSN=20 dB

Table 3. Constellation recognition results of modulated signal when σχ2=0.25, RSN=20 dB