Online self-adaptive bit and power distribution and code rate selection method for LED visible light communication

Abstract

The invention discloses an online self-adaptive bit and power distribution and code rate selection method for LED visible light communication. Firstly, a data frame correct for CRC check is reversely coded and modulated in an online normal communication process; then, SINR information is estimated by utilizing more accurate EVM; CRC check is carried out; simultaneously, the frame error rate within a certain time period is counted; the corresponding state is judged; then, a coding rate, a sub-carrier modulation strategy and a power distribution strategy are selected through an equivalent SINR and a corresponding algorithm; therefore, self-adaptive adjustment of transmission parameters in the online communication process is realized; and the transmission efficiency and the spectral utilization efficiency are increased. The method disclosed by the invention is adopted in the online normal communication process; therefore, on the premise that the communication reliability and the total transmission power are constant, the transmission rate is maximized; self-adaptive adjustment of the transmission parameters along with channel conditions in the communication process is realized; therefore, the transmission rate is closer to the channel capacity; and the spectral utilization efficiency is increased.

Description

technical field [0001] The invention relates to an LED visible light communication online adaptive bit, power distribution and code rate selection method, which belongs to the visible light communication technology. Background technique [0002] Indoor visible light communication is a wireless communication solution emerging in the 21st century. It uses white light emitted by Light Emitting Diode (LED) as a communication medium and performs digital communication. Due to the limited wireless frequency resources, the use of visible light for communication can well alleviate the shortage of traditional wireless communication frequency resources. In addition, people are paying more and more attention to ecological and environmental issues, and green communication is being mentioned more and more by people. Visible light communication, as an environmentally friendly, green, and non-high-power radiation pollution communication method, is the current indoor short-distance wireless ...

AI Technical Summary

Problems solved by technology

[0004] However, most of the current wireless optical OFDM communication systems are designed for specific channels to ensure normal communication under the condition of constant or poor channel conditions. However, if the channel conditions change during the online communication process, OFDM modulation strategy It cannot be adjusted online in real time, and the real-time transmission rate cannot be changed according to channel conditions

So, such a system is flawed

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