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Generalized space-time pulse position modulation method

A pulse position modulation, space-time technology, applied in the field of wireless optical communication, can solve the problems of neglect and utilization, and achieve the effects of excellent bit error performance, low energy consumption, and reduced computational complexity

Active Publication Date: 2020-07-17
LANZHOU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0004] In the above OSM / OSSK scheme, only space resources are used to increase the transmission rate, and the utilization of other resources, such as time resources, is ignored.

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Embodiment Construction

[0014] In order to improve the transmission rate and bit error performance of the optical space modulation system, the present invention proposes a generalized space-time pulse position modulation, an optical space modulation method suitable for improving the system transmission rate and bit error performance in turbulent channels. Its goal is to map the laser serial number to a generalized space-time dispersion matrix index, and map different PPM signals on different active lasers, thereby greatly improving the transmission rate of the system under the premise of ensuring better bit error performance , and the computational complexity of the system is reduced by adopting the sphere decoding algorithm at the receiving end. The present invention will be described in detail below with specific implementation in conjunction with the accompanying drawings.

[0015] The present invention achieves through following technical measures:

[0016] For one with N t lasers (LD) and N r...

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Abstract

The generalized space-time pulse position modulation method mainly comprises the following steps: carrying out spatial domain and signal domain mapping on a binary information block, performing the detection of a received signal and comparing calculation complexity , and calculating the upper bound of the error rate of a generalized space-time pulse position modulation system, wherein the spatialdomain mapping is used for mapping a laser serial number into a generalized space-time dispersion matrix block according to a rank maximization criterion, and the signal domain mapping is used for mapping different pulse position modulation symbols on different activated lasers. The mapped signal is sent out by an optical antenna, and generalized space-time dispersion matrix index and digital modulation signal detection is carried out at a receiving end by using a sphere decoding algorithm. An error rate upper bound of generalized space-time pulse position modulation is derived by using a joint boundary technology. According to the scheme, on the premise that the cost is not increased, the transmission rate and the error code performance of the system are greatly improved, and the calculation complexity of the system is reduced.

Description

technical field [0001] The invention relates to the technical field of wireless optical communication, in particular inventing a generalized space-time pulse position modulation aimed at Gamma-Gamma turbulence channels, which further improves the transmission rate and bit error performance of optical space modulation. Background technique [0002] Optical multiple-input multiple-output (OMIMO) technology has become one of the research hotspots in the field of wireless optical communication (WOC) in the past ten years because of its large transmission capacity and high reliability. However, due to its multiple sub-channels working at the same time, there will be problems in the system such as strong inter-channel interference (ICI), difficult inter-channel synchronization (IAS), and complex decoding at the receiving end, which limits the wide application of OMIMO. Therefore, there is an urgent need to explore and find new technologies to make up for the shortcomings of OMIMO ...

Claims

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Application Information

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IPC IPC(8): H04B10/524H04B10/50H04B10/66
CPCH04B10/524H04B10/503H04B10/66Y02D30/70
Inventor 王惠琴张悦包仲贤吕佳芸豆红霞黄超杨丽荣叶归清王博
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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