Blind detection method for underwater visible light communication system
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A technology for visible light communication and blind detection, applied in baseband systems, transmission systems, short-range systems, etc. Predictive, improved BER performance
Active Publication Date: 2021-08-06
SUN YAT SEN UNIV
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[0004] The purpose of the present invention is to solve the technical defects of poor detection performance and limited application scenarios in existing blind detection schemes, and to provide a blind detection method for underwater visible light communication systems
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Embodiment 1
[0071] Such as figure 1 As shown, a blind detection method for an underwater visible light communication system includes the following steps:
[0072] S1: Build a UVLC system for OOFDM modulation and communicate through UVLC channels;
[0073] S2: The transmitting end of the UVLC system performs baseband signal modulation and amplitude limiting to obtain time-domain transmitting signals;
[0074] S3: Modeling the channel impulse response CIR of the UVLC system during the transmission of the time-domain transmit signal through the UVLC channel;
[0075] S4: According to the modeling result, establish a frequency domain baseband signal transmission model;
[0076] S5: The receiving end of the UVLC system performs blind detection on the frequency domain baseband signal transmission model based on the neural network BDNet;
[0125] In order to more fully illustrate the beneficial effects of the present invention, the effectiveness and advancement of the present invention will be further described below in combination with the simulation analysis and results of a specific embodiment.
[0126] First, DCO-OFDM is selected as the OOFDM scheme of this embodiment. In the DCO-OFDM system, one frame contains 100 OOFDM symbols, the number of subcarriers K is 64, the bandwidth is 500MHz, and the modulation method is 16-QAM. In the deep blind channel estimation unit, the number of convolutional layers is set to 12. Table 1 lists the main parameters of the simulation.
[0129] Among them, the literature [7] is D.P.Kingma and J.L.Ba, "Adam: a method for stochastic optimization," in Proceedings of International Conference for Learning Representations (ICLR), San Diego, USA, 7-9May 2015.
[0130] Figure 5 Comparing different detection schemes in ...
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Abstract
The invention provides a blind detection method for an underwatervisible 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 basebandsignal modulation and amplitude limiting to obtain a time domain transmitting signal; modeling a channel impulse response of the UVLC system; establishing a frequency domainbasebandsignal transmission model according to a modeling result; and enabling the receiving end of the UVLC system to perform blind detection on the frequency domainbaseband 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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