Transmitting light path selecting method for combined diversity reception in MIMO (Multiple-input and Multiple-Output)free space optical communication

A free-space, diversity receiving technology, applied in space transmit diversity, diversity/multi-antenna systems, electrical components, etc., to solve problems such as underutilization of space diversity receive diversity technology

Active Publication Date: 2012-12-12
SHANDONG UNIV
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Problems solved by technology

[0004] However, the method of Picharz Castillo Vazque is mainly to use the channel state information to select the best optical path to transmit the optical signal among the Nt lasers at the transmitting end, and the receiving end is only equipped with a detector, without Make full use of receive diversity technology in space diversity

Method used

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  • Transmitting light path selecting method for combined diversity reception in MIMO (Multiple-input and Multiple-Output)free space optical communication
  • Transmitting light path selecting method for combined diversity reception in MIMO (Multiple-input and Multiple-Output)free space optical communication
  • Transmitting light path selecting method for combined diversity reception in MIMO (Multiple-input and Multiple-Output)free space optical communication

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Embodiment

[0030] The present invention is introduced by taking a MIMO free-space optical communication system in which the number of lasers at the transmitting end is 2 and the number of detectors at the receiving end is Nr=2 or 3 as an example. System block diagram as figure 1 Shown: The input data sequence goes through the OOK modulator Gaussian pulse modulation, and then select the optimal optical path from the two lasers through the optical path selector, and emit through the laser where the optimal optical path is located.

[0031] The optimal optical path is obtained as follows:

[0032] The channel state information is known at the receiving end, that is, the light intensity gain I ij , assuming that the photoelectric conversion efficiency of the receiving end is 1, the light intensity gain of the i-th laser to Nr (Nr=2 or 3) detectors after equal-gain combination If B 1 2 , according to formula (2), it can be seen that the optical path of the second laser is optimal, so th...

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Abstract

The invention discloses a transmitting light path selecting method for combined diversity reception in MIMO (Multiple-input and Multiple-Output)free space optical communication, and belongs to the technical field of MIMO free space optical communication. The transmitting light path selecting method comprises the following steps of: carrying out comparison on the light intensity gain after the gains from each laser to Nr detectors and the like are combined to obtain a serial number of the laser with maximum light intensity gain value, and then feedbacking the serial number of the laser to a light path selector at a transmitting end by a low-speed feedback channel so as to enable the transmitting end to select and activate the optimal laser for transmitting light signals. The method disclosed by the invention has the advantages that the system performances of the MIMO free space optical communication modulated on basis of OOK (On-Off Keying) are obviously improved, and compared with maximal-ratio combining reception, the complexity for realizing the method of united equal-gain combining reception, adopted by the invention, on hardware can be reduced.

Description

technical field [0001] The invention relates to a transmission light path selection method for joint diversity reception in MIMO free-space optical communication, and belongs to the technical field of MIMO free-space optical communication. Background technique [0002] As we all know, due to the advantages of low cost, good confidentiality, convenient installation, and no need for frequency license, free space optical communication has attracted widespread attention in short-distance high-speed wireless communication. In particular, it is used to solve the "last mile" communication. However, free-space optical communication will be affected by rain, fog, and atmospheric turbulence. The light intensity of the received signal has a flicker effect, which causes random fluctuations in signal intensity. Large bit error rates or short communication link interruptions. Introducing the idea of ​​space diversity (such as orthogonal space-time codes and repetition codes in transmit ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/10H04B7/04
Inventor 朱雪梅
Owner SHANDONG UNIV
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