Machine Learning Multiband Carrier-Free Amplitude-Phase Modulation System Based on Independent Element Analysis

Abstract

The invention belongs to the technical field of visible light communication, and specifically relates to a machine learning multi-band carrier-free amplitude-phase (multi-band CAP) modulation system based on independent element analysis (ICA). The system of the present invention mainly includes matched filtering & down-sampling, first-level CAP forming and cross-matching filtering, ICA sub-band signal purification, each sub-band signal recovery phase offset, second-level CAP forming and cross-matching filtering, and subtracting sub-band interference , least mean square filter and other modules. In the present invention, after inversion of sub-band interference at the receiving end, it is sent to ICA together with the original received sub-band signal to initially purify each sub-band signal, and then through the second-stage sub-band interference inversion and subtracting the inter-sub-band interference, and then use the second level of equalization to eliminate the guard interval between sub-bands, improve the tolerance of the system to aliasing between sub-bands, achieve the same transmission rate with less bandwidth, and use the signal bandwidth more effectively , to improve the spectrum utilization of the visible light communication system.

Description

technical field [0001] The invention belongs to the technical field of visible light communication, and in particular relates to a machine learning multi-band carrier-free amplitude phase modulation (CAP) system based on independent element analysis (ICA) applied in a visible light communication system. Background technique [0002] Visible light communication (Visible Light Communication, VLC) uses LED as a light source. Under the premise of normal lighting, lighting equipment can be equipped with functions such as "wireless router", "communication base station", and "network access point". Visible light communication, as a new communication mode combining lighting and optical communication, will promote the integrated development and technological progress of next-generation lighting and access networks, and has become the focus and commanding heights of competition at home and abroad. The development of visible light communication is of great significance no matter at the...

AI Technical Summary

Problems solved by technology

[0004] Carrierless Amplitude and Phase Modulation (Carrierless Amplitude and Phase, CAP), as a high spectral efficiency amplitude modulation, has been proved by experiments to be a very suitable modulation method for visible light communication systems. Multi-sideband CAP modulation systems in multi-user scenarios In this case, a certain frequency interval (guard band) must be reserved between the sub-bands, which will cause the spectrum utilization efficiency of the VLC system to be low.

At the same time, the current machine learning signal processing methods used in communication systems are basically based on the idea of ​​data-driven, using the communication system as a black box and data-driven training and learning, which greatly increases the dependence of the machine learning model on data. The communication system itself gives enough thought

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