Capacity optimization method, communication method and system of mobile wireless optical communication system

Abstract

The invention discloses a capacity optimization method, a communication method and system of a mobile wireless optical communication system. The capacity optimization method comprises the following steps: establishing a mobile channel impulse response model; calculating a telecommunication noise ratio output by the receiver; calculating bit error rate values of the wireless optical communication system in different candidate modulation formats according to the telecommunication noise ratio output by the receiver; selecting a first modulation format and a second modulation format from differentcandidate modulation formats; determining the number of code elements of a first modulation format and a second modulation format in each data frame; and constructing a time domain hybrid modulationframe according to the number of the code elements in the first modulation format and the second modulation format, modulating data through the time domain hybrid modulation frame, and performing datatransmission. According to the method, the actual state of the mobile wireless optical channel can be effectively adapted, and the signal transmission scheme is adaptively adjusted and optimized according to the mobile state information of the terminal, so that the spectral efficiency and the mobile transmission capacity of the system are dynamically optimal, and the reliable transmission qualityof the link is ensured.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a capacity optimization method, a communication method and a system of a mobile wireless optical communication system. Background technique [0002] With the continuous development of mobile Internet, Internet of Things, virtual reality and other technologies, people have carried out a lot of research on indoor wireless optical communication technology. However, these studies mainly focus on point-to-point transmission scenarios where terminals are stationary. In recent years, in diverse wireless optical communication applications, users or services have increasing demands on terminal mobility. For example, home users want to be able to access the Internet through lights in different indoor locations and have a good user experience; in industrial scenarios, sensors and relay nodes installed on mobile robotic arms and production lines need to have high-quality serv...

AI Technical Summary

Problems solved by technology

The disadvantages of traditional adaptive modulation techniques are as follows: For single-carrier systems, the correspondence between the spectral efficiency achievable with a single modulation format and the longest transmission distance it supports remains discrete

For example, when the location of the mobile terminal is between the longest transmission distance supported by two modulation formats (such as PAM2 and PAM4), in order to ensure the link transmission quality, only the lower order modulation format (ie PAM2) can be selected. , so the optimal spectral efficiency cannot be achieved

Although the spectrum efficiency can be further improved by using multi-carrier OFDM technology, in order to adaptively modulate OFDM signals, it is usually necessary to feed back complete channel state information (such as each frequency point), so when the terminal moves, the channel is constantly changing It will lead to a large amount of feedback overhead, reduce the efficiency of uplink transmission, and it is difficult to maintain reliable system transmission performance under the condition of limited uplink transmission resources

At the same time, compared with single-carrier modulation, OFDM has higher processing complexity and higher signal peak-to-average ratio, which will cause system performance to decline

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