Method for blind detection and modulation constellation optimization in wireless optical communication and storage medium

A technology of wireless optical communication, optimization method, applied in the field of communication

Active Publication Date: 2018-04-03
ZHENGZHOU UNIV
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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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  • Method for blind detection and modulation constellation optimization in wireless optical communication and storage medium
  • Method for blind detection and modulation constellation optimization in wireless optical communication and storage medium
  • Method for blind detection and modulation constellation optimization in wireless optical communication and storage medium

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[0058] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0059] In the massive MIMO outdoor wireless optical communication environment, each sub-channel experiences a complex and changeable channel environment, causing random attenuation to the optical signal. At this time, using the pilot signal to estimate the channel will cause a large system overhead. In the case of a large number of receiving and transmitting antennas, only the statistical information of the channel is used to optimize the design of the optimal detection and modulation constellation of the transmitting and receiving signals to optimize the average symbol error rate of the system, but its performance is limited by the number of antennas at the transmitting end and the receiving end. The number of antennas, among which the number of antennas at the receiving end is the main influencing factor. Under the condition that th...

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Abstract

The invention discloses a channel statistical information based maximum likelihood blind detection method and a transmission modulation constellation optimization design method in a large-scale MIMO (multiple-input multiple-output) outdoor wireless optical communication system in the technical field of communication. The method includes: under the condition of large-scale transceiving antennas, determining that receiving end signals approximately comply with Gaussian distribution according to the central-limit theorem and the law of large numbers to further obtain an asymptotically optimal judgment threshold of receiving signals of any modulataion orders; according to an exponential attenuation item which is a main component of a system average symbol error rate, adopting a principle of maximizing minimum exponential attenuation coefficients to perform modulation constellation optimization design to minimize the system average symbol error rate; finally adopting a numerical iterative solution method to obtain optimized modulation constellations, so that system performances are evidently improved. Compared with a traditional method, the method has advantages that by optimal detection of the transceiving signals and modulation constellation optimization design according to channel statistical information, the system performances can be evidently improved and approach to known channel information system performances while low system cost is realized, and accordingly feasibility of the method in practical application is improved.

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 ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/0413H04B7/0426H04L25/02
CPCH04B7/0413H04B7/0426H04L25/0238
Inventor 高向川李豪靳进王忠勇杨守义
Owner ZHENGZHOU UNIV
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