基于模糊聚类与BP神经网络的无线光副载波调制识别 
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Modulation Recognition of Wireless Optical Subcarrier Based on Fuzzy Clustering and Back Propagation Neural Net
西安理工大学自动化与信息工程学院, 陕西 西安 710048
图 & 表
图 1. 大气湍流信道下副载波MPSK信号聚类星座图。(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
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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图 2. 4种调制方式对应的模糊聚类硬趋势均值。(a) T2;(b) T4;(c) T8;(d) T16
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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图 3. 改进BP神经网络均方误差曲线。(a) σχ2=0.1;(b) σχ2=0.2
Fig. 3. Mean square error curve of improved BP neural network. (a) σχ2=0.1; (b) σχ2=0.2
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表 1σχ2=0.1,RSN=20 dB时调制信号星座图识别结果
Table1. Constellation recognition results of modulated signal when σχ2=0.1, RSN=20 dB
| Test | Standard |
|---|
| =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 |
|
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表 2σχ2=0.2,RSN=20 dB时调制信号星座图识别结果
Table2. Constellation recognition results of modulated signal when σχ2=0.2, RSN=20 dB
| Test | Standard |
|---|
| =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 |
|
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表 3σχ2=0.25,RSN=20 dB时调制信号星座图识别结果
Table3. Constellation recognition results of modulated signal when σχ2=0.25, RSN=20 dB
| Test | Standard |
|---|
| =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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陈丹, 王晨昊, 姚伯羽. 基于模糊聚类与BP神经网络的无线光副载波调制识别[J]. 激光与光电子学进展, 2018, 55(6): 060602. 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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