Layered optical spatial modulation method suitable for turbulent flow channel

Abstract

The invention discloses a layered optical spatial modulation method suitable for a turbulent flow channel. The layered optical spatial modulation method mainly comprises layered optical space modulation layer mapping and bit mapping methods, receiving end signal detection and demapping and layered optical space modulation system bit error rate upper bound calculation. The layer mapping is to divide input bit information into two layers, the bit mapping is to determine an LD serial number and a pulse amplitude or a pulse position activated by each layer according to a mapping rule, and two lasers modulated by PPM and PAM are activated at the same time to send information; and the receiving end adopts a maximum likelihood decoding detection algorithm to complete detection of the laser serialnumber and the digital modulation signal, and the transmitting end bit information can be recovered after corresponding reflection and emission. On this basis, the upper bound of the bit error rate of layered optical space modulation is derived. The construction of the layered light space modulation system effectively improves the spectrum efficiency and transmission rate of the system.

Description

technical field [0001] The invention relates to a layered optical space modulation method for a turbulent channel. The method further improves the spectral efficiency and transmission rate of the optical space modulation by combining multiplexing technology with different modulation modes, and belongs to the technical field of wireless optical communication. Background technique [0002] With the rapid growth of user terminals and the sharp increase in the amount of various business data, people put forward higher requirements for the capacity and transmission rate of wireless optical communication systems. the goal that is pursued. Optical multiple-input multiple-output (MIMO) technology increases system capacity and reliability by using multiple antennas to simultaneously transmit data to a receiver. However, in traditional MIMO technology, due to problems such as inter-channel interference and difficulty in synchronization between antennas, its promotion and application ...

AI Technical Summary

Problems solved by technology

However, the system only uses the serial number of the active antenna to transmit information, so its spectral efficiency is limited

At the same time, since most wireless optical communication systems use intensity modulation / direct detection methods, the theories and methods related to spatial modulation in the original radio frequency field cannot be directly used in WOC.

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