Machine learning multi-band carrier-free amplitude and phase modulation system based on independent element analysis

Abstract

The invention belongs to the technical field of visible light communication, and particularly relates to a machine learning multi-band carrier-free amplitude phase modulation system based on independent component analysis (ICA). The system mainly comprises a matched filtering & down-sampling module, a first-stage CAP forming and cross-matched filtering module, an ICA sub-band signal purification module, a phase offset recovery module of each sub-band signal, a second-stage CAP forming and cross-matched filtering module, a subtraction sub-band interference module, a minimum mean square filtering module and the like. According to the invention, sub-band interference inversion is carried out at a receiving end; the signals and original receiving sub-band signals are sent to ICA for preliminary purification of each path of sub-band signals; secondly, performing second-stage sub-band interference inversion, and subtracting interference between sub-bands; and the second-stage equalization isadopted, so that the guard interval between the sub-bands can be eliminated, the tolerance degree of the system to aliasing between the sub-bands can be improved, the same transmission rate can be realized by using less bandwidth, the signal bandwidth can be utilized more effectively, and the spectrum utilization rate of the visible light communication system can be improved.

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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