Hybrid PLC/VLC system combined user pairing and subcarrier allocation scheme

Abstract

The invention relates to a hybrid PLC / VLC system joint user pairing and subcarrier distribution scheme, and belongs to the technical field of power line communication and optical communication. In a user pairing stage, the scheme comprises the steps of: judging whether the number of users can be divided by 4 or not, if so, dividing the users into four groups according to a descending order of channel gains, and pairing the first group and the third group as well as the second group and the fourth group according to an optimal user pairing scheme respectively; otherwise, pairing the first userand the last user arranged according to the channel gain, and performing optimal user pairing on the remaining users according to the condition that the remaining users can be divided by 4. In the subcarrier distribution stage, roulette operation, crossover operation based on a crossover critical value and self-adaptive mutation operation are sequentially executed in each iteration until convergence conditions are met, and at the moment, subcarrier distribution schemes of all paired user pairs are output. According to the method, the calculation complexity can be reduced while the sum rate ofthe hybrid PLC / VLC system is ensured, and the fairness and the user satisfaction of the hybrid PLC / VLC system can also be considered.

Description

technical field [0001] The invention belongs to the technical field of optical communication, and relates to a mixed PLC / VLC system joint user pairing and subcarrier allocation scheme. Background technique [0002] With the rapid growth of the number of mobile communication users, the radio frequency band occupied by traditional radio frequency (Radio frequency, RF) communication is becoming more and more crowded. Visible Light Communication (VLC) based on light-emitting diodes has low power consumption and no electromagnetic With the advantages of interference, large available bandwidth, and no need for authentication, it has become a high-speed wireless access solution with great potential. However, visible light cannot be directly used as an information source, and it must be connected to the backbone network to avoid becoming an information island. Among all backbone network candidates, power line communication can utilize the existing infrastructure of each light emitti...

AI Technical Summary

Problems solved by technology

Existing studies have shown that the introduction of NOMA technology in VLC networks can improve the multi-user visible light communication system and rate, but it does not limit the number of users in a subcarrier. When multiple users share a subcarrier, it will lead to high The computational complexity and decoding delay of

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