A Joint User Pairing and Subcarrier Allocation Scheme for Hybrid PLC/VLC System

Abstract

The invention relates to a mixed PLC / VLC system combined user pairing and subcarrier allocation scheme, belonging to the technical fields of power line communication and optical communication. In the user pairing stage, it is judged whether the number of users is divisible by 4. If yes, the users are divided into four groups in descending order of channel gain, and the first group and the third group, as well as the second group and the fourth group are paired according to the optimal user pairing scheme. ; Otherwise, pair the first user and the last user arranged according to the channel gain, and perform optimal user pairing for the remaining users according to divisible by 4. In the subcarrier allocation stage, each iteration executes the roulette operation, the crossover operation based on the crossover critical value, and the adaptive mutation operation until the convergence condition is met, at which point the subcarrier allocation schemes of all paired user pairs are output. The method of the invention can reduce the computational complexity while ensuring the mixed PLC / VLC system and rate, and can also take into account the fairness and user satisfaction of the mixed PLC / VLC system.

Description

Technical field [0001] The present invention belongs to the field of optical communication, and involves a mixed PLC / VLC system combined with user pairing and subcarrier allocation scheme. Background technique [0002] With the rapid growth of mobile communication users, the radio wave bands occupied by the radio frequency, RF) communications, and Visible LightCommunication, VLCs are low, and no electromagnetism is low, no electromagnetism. Interference, the advantages of large bandwidth are large and no certification, and become a high-speed wireless access scheme. However, visible light can not be directly used as a source of information, to avoid information from the backbone network, in all backbone candidates, power line communication can utilize the existing infrastructure of each Light Transempting Diode, LEDs, and No additional wiring is required. Therefore, it is recommended to provide data to the VLC transmitter using power line communication, PLC, proposed a hybrid P...

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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