CN202110469738
CN113225131A
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摘要:本发明提供一种水下可见光通信(简称UVLC)系统的盲检测方法,包括:构建用于光正交频分复用调制的UVLC系统;UVLC系统发射端进行基带信号调制与限幅,得到时域发射信号;建模UVLC系统的信道冲激响应;根据建模结果,建立频域基带信号传输模型;UVLC系统接收端基于神经网络BDNet对频域基带信号传输模型进行盲检测。本发明提出的盲检测方法,在无导频和无信道先验信息条件下实现UVLC系统的信号盲检测,进一步提高现有UVLC系统的频谱效率;同时,利用基于学习的符号判决门限来恢复发送符号,根据盲信道估计的行为自适应调整判决门限,不仅增强了神经网络的可解释性和可预测性,还提高了系统的误比特率性能。
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Abstract: The invention provides a blind detection method for an underwater visible light communication (UVLC) system. The blind detection method comprises the following steps: constructing the UVLC system for optical orthogonal frequency division multiplexing modulation; enabling the transmitting end of the UVLC system to perform baseband signal modulation and amplitude limiting to obtain a time domain transmitting signal; modeling a channel impulse response of the UVLC system; establishing a frequency domain baseband signal transmission model according to a modeling result; and enabling the receiving end of the UVLC system to perform blind detection on the frequency domain baseband signal transmission model based on the neural network BDNet. According to the blind detection method provided by the invention, the signal blind detection of the UVLC system is realized under the condition of no pilot frequency and no channel prior information, and the spectrum efficiency of the existing UVLC system is further improved; meanwhile, a symbol judgment threshold based on learning is utilized to recover a sending symbol, and the judgment threshold is adaptively adjusted according to the behavior of blind channel estimation, so that the interpretability and predictability of the neural network are enhanced, and the bit error rate performance of the system is also improved.
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申请人: 中山大学
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Applicant: UNIV SUN YAT SEN
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地址: 510275 广东省广州市海珠区********(隐藏)
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发明(设计)人: 江明 陈俊羽
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Inventor: JIANG MING; CHEN JUNYU
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主分类号: H04B10/116(20130101)
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分类号: H04B10/116(20130101) H04B13/02(20060101) H04L25/02(20060101) H04L25/03(20060101)
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