A blind detection method for underwater visible light communication system

A visible light communication and blind detection technology, applied in baseband systems, transmission systems, digital transmission systems, etc., can solve problems such as poor detection performance and limited application scenarios, and achieve enhanced interpretability and predictability, and improved spectrum Efficiency, the effect of improving BER performance

Active Publication Date: 2022-04-05
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[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

Method used

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  • A blind detection method for underwater visible light communication system
  • A blind detection method for underwater visible light communication system
  • A blind detection method for underwater visible light communication system

Examples

Experimental program
Comparison scheme
Effect test

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;

[0077] Among them, OOFDM means optical orthogonal frequency division multiplexing; UVLC means underwater visible light communication.

[0078] In the spec...

Embodiment 2

[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.

[0127] Table 1: Simulation main parameter table

[0128]

[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 underwater visible light communication (referred to as UVLC) system, comprising: constructing a UVLC system for optical OFDM modulation; the transmitting end of the UVLC system performs baseband signal modulation and amplitude limiting to obtain the time domain transmission signal; model the channel impulse response of the UVLC system; establish a frequency domain baseband signal transmission model based on the modeling results; the receiver of the UVLC system performs blind detection on the frequency domain baseband signal transmission model based on the neural network BDNet. The blind detection method proposed by the present invention realizes the signal blind detection of the UVLC system under the condition of no pilot frequency and no channel prior information, and further improves the spectrum efficiency of the existing UVLC system; at the same time, it uses the symbol judgment threshold based on learning to resume transmission symbols, and adaptively adjust the decision threshold according to the behavior of blind channel estimation, which not only enhances the interpretability and predictability of the neural network, but also improves the bit error rate performance of the system.

Description

technical field [0001] The invention relates to the field of underwater visible light communication (UVLC), and proposes a novel blind detection method for an UVLC system modulated by optical orthogonal frequency division multiplexing (OOFDM). Background technique [0002] In recent years, underwater visible light communication (UVLC) has become a strong contender to meet the needs of underwater wireless broadband communication due to its higher bandwidth than underwater acoustic and underwater radio frequency communications. In the UVLC system, Optical Orthogonal Frequency Division Multiplexing (OOFDM) is a commonly used modulation technology, which can effectively resist the frequency selective fading caused by the UVLC channel scattering effect, thereby providing a higher transmission rate and meeting the requirements of underwater Requirements for high-speed data services, such as imaging, real-time video transmission, and underwater sensor network data interaction and o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/116H04B13/02H04L25/02H04L25/03
CPCH04B10/116H04B13/02H04L25/0254H04L25/03
Inventor 江明陈俊羽
Owner SUN YAT SEN UNIV
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