Blind detection and modulation constellation optimization method and storage medium in wireless optical communication

Abstract

The invention discloses a maximum likelihood blind detection method based on channel statistical information and a transmission modulation constellation optimization design method in a large-scale MIMO (Multiple-Input Multiple-Output) outdoor wireless optical communication system in the field of communication technology. In the case of a large number of transceiver antennas, firstly, according to the central limit theorem and the large number theorem, it is determined that the signal at the receiving end approximately obeys the Gaussian distribution, and then the asymptotically optimal decision threshold of the received signal with any modulation order is obtained, and then according to the system average symbol error rate Principal component: exponential attenuation item, using the criterion of maximizing the minimum exponential attenuation coefficient of each part to optimize the design of the modulation constellation, so that the average symbol error rate of the system is minimized, and finally using the method of numerical iterative solution to obtain the optimized modulation constellation, which significantly improves the system performance. The present invention only uses the statistical information of the channel to perform optimal detection and modulation constellation optimization design on the receiving and receiving signals. Compared with the traditional method, the system performance can be significantly improved, and the system performance of the known channel information is approached, and at the same time, it has a lower system overhead. , thus improving the feasibility of this method in practical applications.

Description

technical field [0001] The present invention relates to a blind detection design method and a transmission modulation constellation optimization design method in the field of communication technology, in particular to a large-scale MIMO outdoor wireless optical (Optical Wireless Communication, OWC) communication system using channel statistical information to optimize sending and receiving signals. Detection and modulation constellation optimization design. Background technique [0002] With the rapid development of wireless communication technology, wireless optical communication technology can effectively alleviate the shortage of wireless spectrum resources. At the same time, wireless optical communication technology has the advantages of safety, greenness and simple equipment. It has received extensive attention and research in recent years and will become an important part of future wireless communication technology. Massive MIMO technology has been adopted by the 5th ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a blind detection method based on channel statistical information in a large-scale MIMO outdoor wireless optical communication system and an optimal design method for transmitting modulation constellations, and to perform blind detection on received signals to solve the problems existing in the prior art

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